What is SelectedIndexChanged?

The SelectedIndexChanged event occurs when the SelectedIndex has just changed. The SelectedIndexChanged event does not fire unless the AutoPostBack property is True . The SelectedIndexChanged event handler receives two arguments: The RadDropDownList that is loading items.

What is the use of SelectedIndexChanged in asp net?

The SelectedIndexChanged event is raised when the selection from the list control changes between posts to the server. A list control must persist some values between posts to the server for this event to work correctly.

How do I use Onselectedindexchanged?

Add “onselectedindexchanged” event to the dropdown control. Then disable the textbox when dropdown selected value is 1. This is just an example, you may want to update it to be more flexible but I hope you get the idea. To compare the visible text rather than the value.

What is ListBox control event?

The ListBox represents a Windows control to display a list of items to a user. A user can select an item from the list. It allows the programmer to add items at design time by using the properties window or at the runtime.

How does the onselectedindexchanged event handler work?

The RadioButtonList has been assigned an OnSelectedIndexChanged event handler and the AutoPostBack property is set to True. The AutoPostBack property when set to True, it will raise PostBack when an item is selected or changed in the RadioButtonList and the OnSelectedIndexChanged event will be raised.

How to handle selectedindexchanged event in GridView?

In this article I will explain with an example, how to handle SelectedIndexChanged event for DropDownList inside GridView in ASP.Net using C# and VB.Net. The DropDownList inside GridView will be assigned an OnSelectedIndexChanged event and when an Item is selected (changed), the SelectedIndexChanged event handler is raised.

When does the selected index changed event happen?

Selected Index Changed Event System. Web. UI. Web Controls Occurs when the selection from the list control changes between posts to the server. The following example demonstrates how to specify and code a handler for the SelectedIndexChanged event to display the selection made by the user.

How to trigger onselectedindexchanged event in dropdownlist?

So, make sure that you have no repeated values in the list items to trigger this ” onselectedindexchanged ” event Add property ViewStateMode=”Enabled” and EnableViewState=”true” And AutoPostBack=”true” in drop DropDownList Also make sure the page is valid.