How to use Ajax : CollapsiblePanelExtender in ASP.NET

Step 1: Take one panel and all the content you want to collapse put into this panel.

Step 2: Set the Collapsed Property true.

Step 3: ExpandControlID/CollapseControlID : The Controls that will expand or collapse the panel on a click, respectively. If these values are the same, the panel will automatically toggle its state on each click.

Step 4: TargetControlID is PanelID

Step 5: Select Panel and Set the Property SuppressPostBack="True"
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