DynamicControlsPlaceholder - A placeholder that saves its child controls

Problem:

ASP.NET gives a developer the opportunity to programmatically add controls to a web form using ParentControl.Controls.Add(new Control());
However, these controls are not persisted in any way thus having to be recreated for each subsequent request.

Goal:

To create a control that behaves like a placeholder but additionally handles recreating dynamic controls on subsequent requests.

Procedure:

I have created a custom control called DynamicControlsPlaceholder that derives from Placeholder and overrides Load- and SaveViewState.
In SaveViewState, the control hierarchy is recursively traversed and the control type and ID persisted to a string
In LoadViewState the persisted information is used to recreate the control tree to the state before.

Download (V2.2):

• The sourcecode is available in C# as a VS.NET project.

• A ready-to-use assembly (including help file).

• A demo shows the usage of this control. Sourcecode for the Demo (C#) or Sourcecode for the Demo

From: http://www.denisbauer.com/ASPNETControls/DynamicControlsPlaceholder.aspx