the thing about ASP.NET is that it can have only one form tag per page. While this seems awkward to anyone outside ASP.NET (it seemed awkward even to us when we migrated from .NET 1.1 to .NET 2.0, when this was introduced) it makes sense once you get the feel of it.
Namely, in ASP.NET you do not actually submit a form, rather you create an event handler for each button (or any other UI element for that matter) and in the code behind you write an event handler. So for example you can have 3 buttons in one form - each button has its event handler - meaning that when the button is clicked the code inside of the event handler will be executed. So, even though you have only one form, by taking advantage of the event handlers it's like having three submit buttons.
You can find plenty of great videos on ASP.NET here:
The first few talk about creating the user interface (form) and handling events and postbacks, which is exactly what you are looking for.
I hope you will find this information helpful. Please let us know if there is anything else we can do for you.
the Telerik team
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