Showing Confirm at runtime in .net 2.0

Hi,

      I am working on .NET 2.0 application. I have a button on form. When User clicks on button I want to show  first alert. I am able to do this by adding Attribute to the button in C#. After display message I am doing some things in C# like if file exists or not. IF file doesnt exist I want to show second Confirm box. How can I display Confirm box from C#? I cannot add atrribute to button because at the page load I dont know if the file exists or not.

 

Thank you

Vishal
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