Here i have used two drop down lists to perform this task. Here I will explain how to populate gridview based on dropdownlist selected value in asp. For more information about how to handle events, see Handling and Raising Events. How to easily implement an interactive DropDownlist with user-friendly UI - look at the demo and play with Kendo UI DropDownList. DropDownList control is know as ComboBox control. Partial Class Simplelist Inherits System. NET and I seem to have problems with events This time it is the DropDownList SelectedIndexChanged event that is not firing. NET Developers encounter sometimes. This enables you to provide an event-handling method that performs a custom routine, such as updating a status label with the currently selected row, whenever this event occurs. here is my code:-. NET DropDownList - easy to use, high performance, templates, client-side binding, Odata. SelectedItem. The DDL is being added to the page DropDownList for Inside UpdatePanel not firing on SelectedIndexChanged() event. In this example I have used the DatabaseFirst approach. In this Blog, we will learn how to get the current Row of GridView inside the SelectedIndexChanged Event of a DropDownList present on the GridView itself and then find the other DropDownList and bind that. I am creating dynamically dropdownlist IN first button i have successfully created dynamic number of dropdownlist with help textbox1 and button1. NET MVC Dropdownlist Demo R2 2018 Release is here - now with modern UI for chatbots and more!. textchanged event; When user change text of dropdown list. col1,col1 is the column name of the table which particular value want to change. I binded the data of first dropdownlist at page load. NET using C#. This is a very pared down version of my code, but it contains the problem areas. Selected Index Changed event for asp:DropDownList (VB. Here DropDownList is binded with data in sorted order of Country Name. But i want to fire onchange event on page load also. Net Set number of rows to display in Gridview according to Dropdown Selection in Asp. It shows to create dynamic dropdownlist and maintain selected value during postback in asp. The SelectedIndexChanged event is raised when a row's Select button is clicked, but after the GridView control handles the select operation. 6m developers to have your questions answered on DropDownList Event of UI for ASP. Here I will explain how to populate gridview based on dropdownlist selected value in asp. Net General VB. Net MVC Razor. The drop down list can be configured so that it causes the grid to filter records when the user selects an item. Example of cascading DropDownList | ASP. As a resolution reopen the modal pop in dropdownlist selectindexchanged event like below protected void ddlEditTypeOfLand_SelectedIndexChanged(object sender, EventArgs e) {//Your code here //Open the popup. Can any one helpme out in stoping the PostBack. Solution: We can easily remove the special character from field using script "replace(/[^a-zA-Z 0-9 ]/g, '')" in our query. I'm having around 4-5 infragistics webddropdown multi select boxes, Whenever user selects options in multidropdown list and again selects the above normal asp dropdownlist, the items selected in the multidropdown should be cleared and initial value should be set to "Please Select". Solution: We can easily remove the special character from field using script “replace(/[^a-zA-Z 0-9 ]/g, '')” in our query. I will put here code samples that are not advanced enough to put them elsewhere in this blog. NET DropDownList - easy to use, high performance, templates, client-side binding, Odata. I've been trying to get this to work for hours to no avail (at least they're paying me :cheesy: ). ==>> In this post I explain how Get Selected Value on Dropdownlist selectedindexchanged event using JavaScript this is help us for get value of dropdown without any page post back in asp. I have a problem with DropDownList's SelectedIndexChanged event. DropDownList SelectedIndexChanged Event does not fire and when selecting a new item the dropdown reverts back to 0 (first item). در این مقاله با هم خواهیم آموخت که چگونه میتوان یک کنترل چند انتخابی DropDownList در ASP. net JQuery C#. com ( Learn more ) This section provides detailed information on how to use DevExpress products for ASP. but difference is, selectedindexchanged will execute everytime when user change the item but textchanged won't work if there is same text at in two items no matter if value is different. DropDownList Selected Index Changed Event: In above View sample, the dropdown list has an on change event and that will hit JavaScript method SelectedIndexChanged(). In the same way, you can write your JS functions to handle client-side events. But I don't want this. DropDownList的SelectedIndexChanged事件不响应 我添加了一个DropDownList,在其SelectedIndexChanged中写了如下代码,但没有反映,请高手指导rnrnprivate void DropDownList1_SelectedIndexChanged(object sender, System. How To Create MultiColum Dropdownlist using DropDownExtender Control SelectedIndexChanged Linq WCF Ajax Article WPF node. This is a very pared down version of my code, but it contains the problem areas. Change asp:dropdownlist fore and background. Whenever the first drop down selected then another drop down will be disabled. I want the SelectedIndexChanged event of the dropdownlist to call the rowcommand event of the aspxgridview. In below Index view I have created a DropDownList and use a Model property to fill the items in DropDownList. To achieve this scenario with DropDownList, set the allowVirtualScrolling to true. Solution: Model: First you need to create a class in the Model. NET Core MVC para um DropDownList?. Notice we are sharing the same event handler (DropDown_SelectedIndexChanged) for all DropDownList controls. Like GridView, Paging in ListView control is not an integral part of the control itself. Join a community of over 2. As you can see I am dynamically adding a DropDownList to a panel which is inside an update panel. The first is supposed to fill on page load and then fill the second ddl when it's index changes. When the user selects a page number in the DropDownList we need to change the current page displayed in the GridView. Select the value of asp:DropDownList Selected Item (VB. Sometime we got some cases when we have two dropdownlists in gridview and want second one to be populated based on selection of first dropdownlist. NET MVC: server—The data is serialized to the client. When the User changes the dropdownlist, the SelectedIndexChanged is not firing for that dropdownlist. In this example I have used the DatabaseFirst approach. Selected Index Changed event for asp:DropDownList (VB. Mohanbabu17, if this helps please login to Mark As Answer. I added a column (eg. I have DropDownList in a GridView header template. In this Blog, we will explore one interesting Bug, which ASP. The AsyncPostBackTrigger needs to be specified in the AJAX UpdatePanel in order to fire the SelectedIndexChanged event of the DropDownList using Partial PostBack. I found something about the EnableViewState property. In this article I am going to explain an easy way to populate dropdownlist in MVC. WebControls. In this example we have two TextBoxes. Web User Control DropDownlist Control Event not working. NET) This topic explains how to implement a Property Editor for ASP. The SelectedIndexChanged event does not fire unless the AutoPostBack property is True. The SelectedIndexChanged event occurs on the client side, whenever selection is moved between items within a list editor. There are two ways to bind a Kendo UI DropDownList for ASP. Text="您选择的学校是:"+DropDownList1. This guide presents a couple of common ways to populate dropdown lists in ASP. Net controls in a GridView column to provide additional functionality in the user interface. New here? Start with our free trials. what do you mean with: 'How can I make dropdownlist no postback' ? In your example code I do not see the OnSelectedIndexChanged event. I have a DropDownList inside an update panel. You can create a custom column class that replaces the filter text box with a drop-down list. DropDownList的SelectedIndexChanged事件不响应 我添加了一个DropDownList,在其SelectedIndexChanged中写了如下代码,但没有反映,请高手指导rnrnprivate void DropDownList1_SelectedIndexChanged(object sender, System. processOnServer property to true. Net MVC and tagged ASP. net and Create contact us form/page and Ajax HtmlEditorExtender control to format textbox text and send formatted text in email and Drag & drop to upload multiple files. I queried all the rows containing both option A and option B. Example of cascading DropDownList | ASP. dropdownlist tooltip | dropdownlist | dropdownlistfor | drop down lists excel | dropdownlistfor mvc | dropdownlist c# | dropdownlist mvc | dropdownlist html | d. There are several articles describing how to do this is code behind however: Is it possible to set the value of a dropdownlist to a session variable on the aspx page?. If i changed the value of dropdownlist then its immediately execute selectedIndexChanged event and updated the sql server database table. When the selectedindexchanged event is fired, I store the viewstate in a dataview and filter it by the value of the radio button which checked property is set to true. So, the problem is that i need to save the both values of DropDownLists to a database, i can do easily for the first DropDownList , but how to capture the second value ( DropDownList2. SelectedIndexChanged event of a DopdownList in a Gridview templatecolumn not firing. Net MVC, please refer. Net languages. This demo explains how the cascading jQuery dropdown works in Kendo UI DropDownList widget. Now I will explain how to get dropdownlist selected value using JavaScript in asp. This entry was posted in ASP. Although modifying the editor's item collection may also indirectly change the SelectedIndex property value (e. com When an item is selected in DropDownList, the JavaScript OnChange event handler will be raised which in turn will submit the Form, thus simulating the SelectedIndexChanged event in ASP. This is the preferred technique for handling the event in a derived class. Googling should find examples of both. SelectedValue);rnrn没动静????是不是还要修改什么地方的属性或是。。。? 论坛. below is an example,. Demo for events in ASP. DropDownList From Table Data? Oct 29, 2010. Tadit Dash is a Software Engineer in Mindfire Solutions, Bhubaneswar. You can use literal string delimiter ('string', "string") so your currency symbol string will be copied to the result. Can someone pls help me ? I have an ASP. The topics in this section provide comprehensive information on using DevExpress ASP. SelectedIndexChanged event is raised when the dropdownlist control item selection changes between posts to the server. Net MVC, please refer. and here is what I have in the Page_Load and the SelectedIndexChanged event. Join a community of over 2. Otherwise read on for the lowdown on all things DropDownList in ASP. The GridView control in ASP. Also shown. I had the same problem, the SelectedIndexChanged event not fired. DropDownList Example in ASP. I'm having the weirdest time with a dropdown on the createpostedit control. Protected Sub ListBox1_SelectedIndexChanged(ByVal sender _ As Object, ByVal e As System. The key to the advanced data binding of Telerik RadListView is handling correctly the NeedDataSource event. DropDownList1. I also show that how to call java script method through onchange event of DropDownList (onchange="selectedIndexChanged()"). NET AJAX DropDownList. There are many scenarios while creating a data entry form in the web application, where we need to present the data in DropDownList or ListBox from which user can select one or multiple items. Sorry for that one. Hi, In asp. Creating forms for the web is one of them. When an item is selected in the HTML Select DropDownList, the GetSelectedTextValue JavaScript function is executed to which the reference of the HTML. net We use the onchange event in the java script for get value of dropdown on Dropdownlist selectedindexchanged event in JavaScript. EventArgs) Handles _. UpdatePanel history. The selectedindexchanged event for dropdownlist also doesnt get fired. 解决dropdownlist数据绑定后选择下拉列表后返回的值不变或为空以及不执行SelectedIndexChanged事件 12-18 很多时候会出现这样的情况: 1、选择下拉列表中的某一项之后,string selectedid=Fanwei. Now suppose if I t. But i want to fire onchange event on page load also. Join LinkedIn Summary. Enableviewstate is already true for those controls. 为何我触发不了DropDownList的SelectedIndexChanged事件?rnrn我只在DropDownList的事件里面双击SelectedIndexChanged的空白栏,为什么我在该事件里面写rnrnResponse. Net MVC, ASP. But since doing so - the selectedindexchanged event is not firing (I guess because without view state the control does not know if there was a change in the. Raising an event invokes the event handler through a delegate. DropDownList I m populating subcategory dropdown fom category dropdown. this is so much similar to selectedindexchanged event and code will be almost same. Net controls in a GridView column to provide additional functionality in the user interface. If you are looking for information on managing multiple selections or supporting enums as a data source for your drop down, you should check out my newer post: ASP. I queried all the rows containing both option A and option B. net mvc razor by viewbag, model and jquery - 3 ways Catagory: asp. The best way is to handle the server-side Init event of your controls and set their ClientInstanceName in code. The code in the aspx file is :. In this article, we will learn about HAVING clause, its proper use on the scenarios based, how to eliminate groups of rows that do not satisfy a specified condition, etc. selectedindexchanged not firing with onchange method in javascript dropdown list i'm using javascript method "onchange" to get dropdown selected value i get the. NET MVC Extensions > Data Editors Extensions > ComboBox > Overview - ComboBox. I have taken 3 dropdownlists in gridview when i select the value in first dropdownlist then accourding to that value i should bind 2 and 3 dropdownlists. net developer community that how to change dropdownlist arraow image. Net MVC 4 DropDownList Example by Tan Woon How · Published April 14, 2014 · Updated March 25, 2016 In this tutorial, We will show you how to get data from controller and pass data back to view to display Data into DropDownList. Net DropDownList in C# and VB. Working with postback of dropdown list inside Gridview Many a times there are circumstances where by we need to use dropdown list inside a Gridview and also handle the index changed event of the dropdown list. DataGridItemEventArgs e). Notice we are sharing the same event handler (DropDown_SelectedIndexChanged) for all DropDownList controls. DropDownList control is know as ComboBox control. When I change the index of a dropdownlist programmatically, the list's SelectedIndexChanged event doesn't fire, when I do it manually it does. I tried using dropDownList. This is a most asked question in asp. Inside the datalist i am having a dropdownlist and a textbox. Referencing Controls in Grid Row Edit Form. New here? Start with our free trials. The session variable was set up to try to hold the info for the update, but the method. dropdownlist already set AutoPostBack="true", but still will not fire SelectedIndexChanged event. In this article I am going to explain an easy way to populate dropdownlist in MVC. Net DropDownList SelectedIndexChanged event not firing Make sure you have set AutoPostBack = "true" and also defined SelectedIndexChanged event for the. here is my code:-. Now use the event SelectedIndexChanged to bind the Grid. Here’s how the markup would look like. Mar 8 2011 5:11 AM. Now, according to the Event Life Cycle rules, when you select an Option from DropDownList, it Posts Back and goes to Page Load Event first and then it comes to the SelectedIndexChanged Event. net) Sub DropDownList1_SelectedIndexChanged(sender As Object, e As EventArgs) Select Case DropDownList1. The SelectedIndexChanged event occurs when the SelectedIndex has just changed. Here’s how the markup would look like. AutoPostBack = True ' Manually register the event-handling method for the ' SelectedIndexChanged event. NET Core Those of you who worked with ASP. SelectedIndexChanged event in DropDownList in EditItemTemplate. In this Blog, we will explore one interesting Bug, which ASP. NET Web Forms (Classic). Now suppose if I t. ready() function. NET Core DropDownList component R2 2018 Release is here - now with modern UI for chatbots and more!. Callback event's handler as the CallbackEventArgsBase. NET DropDownList control Example output is: DropDownlist control SelectedIndexChanged event in asp. I had the same problem, the SelectedIndexChanged event not fired. Please see the Note section of the ASPxComboBox. AutoPostBack property get or set a value indicating whether a post back to the server automatically occurs when the user changes the dropdownlist item selection. Part 35 How to set an item selected when an asp net mvc dropdownlist is loaded. A Guide to Work with CheckBox and CheckBoxList using ASP. NET Core DropDownList example to find out how events are triggered in the drop down listcontrol. NET and I seem to have problems with events This time it is the DropDownList SelectedIndexChanged event that is not firing. The SqlDataSource arguments of the dsNotes were bound to the Session. So, the problem is that i need to save the both values of DropDownLists to a database, i can do easily for the first DropDownList , but how to capture the second value ( DropDownList2. RowsPerPage property webgrid i want to choose in DropDownList. I can able to bind the values to the dropdownlist. Text="您选择的学校是:"+DropDownList1. Now I will explain how to get dropdownlist selected value using JavaScript in asp. Using Forums > Off-Topic Posts (Do Not Post Here) Dropdownlist in MVC. Assigns any sources of the event and its information to the control's parent. How To Handle OnChange / SelectedIndexChanged Type Event In JavaScript For The AJAX ComboBox If you have ever used the AJAX ComboBox control and needed to interact with it client side in JavaScript, you will notice it's a bit of a different animal than it's ASP. Unfortunately there is no sample code from the aspx-source and the link to the sample project code is dead. NET MVC seems not very straight forward. HtmlHelper htmlHelper, string name, System. When the selectedindexchanged event is fired, I store the viewstate in a dataview and filter it by the value of the radio button which checked property is set to true. 6m developers to have your questions answered on Grid Dropdownlist Select Event Selected Item Text and Value Undefined of UI for ASP. what do you mean with: 'How can I make dropdownlist no postback' ? In your example code I do not see the OnSelectedIndexChanged event. Platforms: ASP. As the previous poster indicated, I too wonder if the dropdownlist is getting created early enough in the page life-cycle (before viewstate is loaded on a postback) for the SelectedIndexChanged event to fire. IsPostBack Then". The drop down list can be configured so that it causes the grid to filter records when the user selects an item. That's why we chose this exact name. This dropdownlist has a OnSelectedIndexChanged event. In the same way, you can write your JS functions to handle client-side events. DropDownList1. The Virtual Scrolling feature is used to display a large amount of records in the DropDownList, that is, when scrolling, an AJAX request is sent to fetch some amount of data from the server dynamically. By default the SelectedIndex is "John". 6m developers to have your questions answered on Trigger change event manually of Kendo UI for jQuery DropDownList. Net DropDownList and an ASP. Inside the datalist i am having a dropdownlist and a textbox. This simple control brings a very friendly experience to the end user, with enhanced mobile and keyboard support, server and client templates, rich client-side API with a comprehensive set ot events. I have a ddl in a template column of a data grid. DropDownList SelectedIndexChanged event not firing I have a dropdown list that has many items in it - so in order to reduce viewstate size I have shut off viewstate for that control. so i write a tip about that topics. EventArgs e)rnrn Label1. Grid within a dropdownlist Sample Code in C# or vb. Hi, I have a drop downlist which selected index chang by Js when check box check. The testing that i did. This tells me I've at least wired the SelectedIndexChanged event properly. In this gridview control we edit particular gridview row data through this DropdownList selectedIndexChanged event. When the selectedindexchanged event is fired, I store the viewstate in a dataview and filter it by the value of the radio button which checked property is set to true. Value Case 0: Label1. Here’s how the markup would look like. We can use Visual Studio to create ASP. 6m developers to have your questions answered on Trigger change event manually of Kendo UI for jQuery DropDownList. 解决dropdownlist数据绑定后选择下拉列表后返回的值不变或为空以及不执行SelectedIndexChanged事件 12-18 很多时候会出现这样的情况: 1、选择下拉列表中的某一项之后,string selectedid=Fanwei. Net MVC 4 DropDownList Example by Tan Woon How · Published April 14, 2014 · Updated March 25, 2016 In this tutorial, We will show you how to get data from controller and pass data back to view to display Data into DropDownList. Net DropDownList is set to True. NET Core Those of you who worked with ASP. Text = "You got Grade E!". datalist tutorial get search data from the database sql server using dropdownlist selectedindexchanged event. of UI for ASP. you create a dropdownlist from an enum in ASP. Net Web Application To ASP. Controls / Grid / How To / Common. Here i have used two drop down lists to perform this task. What I want is that when user selects the wage type from the dropdownlist if the for example the user selects "salary" from the dropdownlist the settype method in the wage should execute and the view should display the properties of the salary and if the user selects hourly. Do I have to add any javascript code to get the SelectedIndex from the dropdownList ? I´m not very used to this, so I hope somebody can help me. There are several articles describing how to do this is code behind however: Is it possible to set the value of a dropdownlist to a session variable on the aspx page?. DataGridItemEventArgs e). That is first part of task, the next is to get the values of the dropdownlist of this user control to be used in web application. This is a most asked question in asp. NET WebForms Controls and ASP. Select the value of asp:DropDownList Selected Item (VB. Perhaps there is. Now, according to the Event Life Cycle rules, when you select an Option from DropDownList, it Posts Back and goes to Page Load Event first and then it comes to the SelectedIndexChanged Event. net netadvanatge control, i am facing very strange problem i am using dropdownlist within the tab of UltraWebTab control when i change the selection in dropdownlist it doesn't fire the event selectedindexchanged. Keyword Research: People who searched dropdownlist default value also searched. I want, when user focused an element of dropdownlist, SelectedIndexChanged event will not be triggered, and pressing enter or left mouse down events will trigger SelectedIndexChanged event only. All the form elements are encapsulated in a class called CoverObject. I tried using dropDownList. In this article I am going to explain an easy way to populate dropdownlist in MVC. This provides an alternate way for users to enter filter criteria. 3) I create either a RadioButtonList, CheckBoxList or DropDownList. NET Web Forms. 4) I have set AutoPostBack = true and attached the SelectedIndexChanged event handler and method. We will also add yet a new control, to make things more interesting - the DropDownList, which allows the user to select an item from a list. You have selectedindexchanged event attached to dropdownlist and this cause page postback which causes the modal window to close. Protected Sub ListBox1_SelectedIndexChanged(ByVal sender _ As Object, ByVal e As System. This is a very pared down version of my code, but it contains the problem areas. The AutoPostBack feature is a handy way to refresh a page when data being displayed depends on the selection made in a DropDownList. I have two tables, Users and Roles. Getting Started The Basics. Grid within a dropdownlist Sample Code in C# or vb. Maybe some codebehind to show? Or do you need a refreshed DropDownList / TextBoxes without a full postback? In that case use a scriptmanager and an updatepanel around DDL/TB's. Parse(((DropDownList)sender). So, the problem is that i need to save the both values of DropDownLists to a database, i can do easily for the first DropDownList , but how to capture the second value ( DropDownList2. I have placed a dropdownlist in the header template of a column from my AspxGridView. An operator is a reserved symbol or word/letter used to do logical or mathematical operations in the PostgreSQL statement. The GridView control in ASP. The SelectedIndexChanged event of will work / fire / trigger only when the AutoPostBack property of the ASP. In this Blog, we will explore one interesting Bug, which ASP. The topics in this section provide comprehensive information on using DevExpress ASP. Please see the Note section of the ASPxComboBox. Text Case 1: Label1. Basically, I have created an ASP Dropdownlist that I populate with names from a MS Access db. Bind DetailView onSelectedIndexChanged event of Gridview --Example of onSelectedIndexChanged event in ASP. js MVC Security codingbat design. How to get a WebDataGrid cell value in DropDownList_SelectedIndexChanged event? I have GRIDVIEW in ASP. ASPMANTRA | Asp. Chat Now Cart My Downloads Free Trial Log In. Introduction. SelectedItem. So, when ever a selection in the dropdownlist changes, the webform is posted back to the server automatically. Hi, I have a dropdownlist in side a gridview, Onselectedindexchanged I want to some action. NET Code Snippets Javascript SQL Server Gridview asp. I also show that how to call java script method through onchange event of DropDownList (onchange="selectedIndexChanged()"). As the previous poster indicated, I too wonder if the dropdownlist is getting created early enough in the page life-cycle (before viewstate is loaded on a postback) for the SelectedIndexChanged event to fire. NET using VB. Filter with MS DropDownList Instead of Textbox. ddStates_SelectedIndexChange says to populate ddCounties. NET & C#) I am having a repeater inside an update panel and there is one DropDownList inside repeater. As you likely have full system admin on the server the default database will be master so you will find all. Dropdownlist. The event is not fired when the value of the widget is changed programmatically. Telerik ASP. Net Set number of rows to display in Gridview according to Dropdown Selection in Asp. I have loaded a DropDownList in the first row of the child gridview and have loaded checklists in all other rows of the child gridview (I hid the checklists in the first row and the dropdownlist in all other rows). This tells me I've at least wired the SelectedIndexChanged event properly. Learn how to add this feature programmatically to ASP. HTML Markup : Add Gridview to HTML Page. The testing that i did. Problem: On changing the value of Dropdown1 nothing happens dropdown1_selctedIndexchange event do not fire the code and control as follow. New here? Start with our free trials. The Virtual Scrolling feature is used to display a large amount of records in the DropDownList, that is, when scrolling, an AJAX request is sent to fetch some amount of data from the server dynamically. Join a community of over 2. DropDownList SelectedIndexChanged Event does not fire and when selecting a new item the dropdown reverts back to 0 (first item). These controls are categories as server and client based. SelectedIndexChanged event is raised when the dropdownlist control item selection changes between posts to the server. DropDownList SelectedIndexChanged event not working when placed inside GridView Footer in ASP. Join a community of over 2. How To Create MultiColum Dropdownlist using DropDownExtender Control SelectedIndexChanged Linq WCF Ajax Article WPF node. It will not fire on initial formload postback. I have used Cascading DropDownList for Country/State/City in ASP. I have a DropDown which is bounded to an ObjectDataSource. Net MVC dropdownlist selectedindex change event: Create a controller - Dropdownlist. using the popupcontrol extender, a panel, and a gridview, we can have the effect of a gridview within a dropdownlist. Now my grid has functionalities of opening file, copy file, edit description of file, emailing file and deleting file. Databound DropDownList and SelectedIndexChanged Event issues; Dropdown selectedindexchanged event firing when submit button clic; DropDownList SelectedIndexChanged event not firing when in a panel; SelectedIndexChanged event of a DropDownList sometimes not firing; SelectedIndexChanged event. The best way is to handle the server-side Init event of your controls and set their ClientInstanceName in code. selectedindexchanged not firing with onchange method in javascript dropdown list i'm using javascript method "onchange" to get dropdown selected value i get the. The first one specifies the table name. AutoPostBack = True ' Manually register the event-handling method for the ' SelectedIndexChanged event. I also used Updatepanel but after that the action what I want its not happening.