How to Create and Read Values of Dynamic Controls in ASP.Net

Assign SelectedIndexChange Event to DroupDownList

Add the "ddl_SelectedIndexChanged" event to the droupdownlist dynamically using the following code:





Example



The following shows how to to create a dynamic RadioButtonList and read its value.

.ASPX Code



C# Code



Read RadioButtonList Value



Example



Create dynamic CheckBoxList and read their value:

.ASPX Code



C# Code



Read CheckBoxList Value



Example



Dynamically Created Controls Losing Data After Post-back or Retaining State for Dynamically Created Controls in ASP.NET Applications

Before we proceed, we need to keep in mind one thing. When you create a dynamic control in a page and if you do a post-back then the created control will be lost. I mean to say that "When using dynamic controls, you must remember that they will exist only until the next post-back. ASP.NET will not re-create a dynamically added control". You need to recreate all dynamically created controls on every post-back (in load event at the latest). You also need to ensure that they get the same ID as before to trigger events and maintain View State.

To show this issue I have used the following code: