Question

I am developing a dynamic website in ASP.NET. As a trial I tried a code shown below, that adds some controls to Panel1. When user clicks a button for the first time the controls are added to the Panel but when user clicks the same button for second time, the previous controls are replaced with new ones. But I want the controls to be appended one after the other each time the user clicks the button. The code is something like this:

Control c=Page.LoadControl("DData.ascx");
Panel1.Controls.Add(c);

I also tried

Control c=Page.LoadControl("DData.ascx");
Panel1.Controls.AddAt(Panel1.Controls.Count,c);

But this replaces the first output. Please tell me how to append these controls?

Answer 1

As you would expect, this appends a single control:

Control c = Page.LoadControl("DData.ascx");
Panel1.Controls.Add(c);

You can append as many controls as you wish in this fashion.

However, you need to keep track of the controls you are adding in some persisted/stateful fashion (database, Session, ViewState, etc.).

You need to rebuild the control tree every time the page loads.

See my answers to similar questions:

• https://stackoverflow.com/a/10050755/453277
• https://stackoverflow.com/a/9545079/453277