How do I prevent users clicking a button twice?

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If you simply disable the button then ASP.NET won’t post the form. Also you want to deal with client-side validation. Here’s my solution: 

<asp:Button runat="server" ID="btnSave" 
   Text="Save" OnClick="btnSave_Click" 
   OnClientClick="if (!Page_ClientValidate()){ return false; } this.disabled = true; this.value="Saving...";" 
   UseSubmitBehavior="false" />

See @Dave Ward’s post for a description of UseSubmitBehavior.

If you have multiple validation groups you’ll need to enhance this solution for that.

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