Dynamically Add a WEB control. Click the control to obtain the dynamically added control.

The code in PageLoad is as follows:
For (int I = 0; I <GridView1.Rows. Count; I ++)
{
TextBox txt = new TextBox ();
Txt. ID = "txt" + I;
GridView1.Rows [I]. Cells [7]. Controls. Add (txt );
}

In the Click Event of a button
For (int I = 0; I <GridView1.Rows. Count; I ++)
{
Control controlText = GridView1.Rows [I]. Cells [7]. FindControl ("txt" + I );
}

Note:

The code for dynamically adding controls cannot be placed in non-IsPostBack. You can execute the code for dynamically adding controls, whether IsPostBack or not.
For example:

Page_Load ()
{
If (! This. IsPostBack)
{

}
This. addControls ();
}