Postsave event handlers in C#

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C#3.5

Hi,

I am new to Event Handlers in ASp.Net. My doubt is, In a page there are 3 Textboxes (Name, Email and Details). Out of those 3, Name and Email are the mandatory fields. Wilthout fillinf those textboxes, if user clicks on SAVE, it should give an error (red mark on the mandatory fields) and shouldn't save.

I am working on a website with the help of it's API.

The only thing i do have is, The GUIDs of the Name and Email fields.

Can anyone please help me on how to do this? I do not have code and all.... i have to get a brief idea before doing this. Thanks in advance.

What I have tried:

I tried in google but syntax is unable to find. Any help would be appreciated.