To get the selected item value of the DropDownList control on the post back, use the server-side OnValueSelect event of the DropDownList, so that you can access the DropDownList data in the code behind. The OnValueSelect server-side event triggers the post back when the value of the DropDownList item is changed and maps to the corresponding event handler in the code behind. In the server-side event handler, you can access the value, ID, text, and checked state details by using the DropdownListEventArgs variable. Refer to the following code example.
|Article ID:||Published Date:||Last Revised Date:||Platform:||Control:||Product Version:|
|3660||01/31/2015||09/18/2015||ASP.NET Web Forms||DropDownList||22.214.171.124|