When building a webapplication, have you ever wanted to display an alert asking a user whether he really, really wanted to delete some data?

In ASP.NET 2.0 this is made easy by the OnClientClick property on the button control.

Just enter the following JavaScript in the property and the user will have to confirm the action. If the user cancels, then the button will not perform a postback and the serverside event never even fires.

if (!confirm('Are you sure you want to delete this customer?')) return;

[11/27/2007] Update:

The code above will work if the button you're adding the OnClientClick to has UseSubmitBehavior="false" if not, then you should use:

if (!confirm('Are you sure you want to delete this customer?')) return false;

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