Trying to create a try...catch loop to validate if the value in a textbox is greater than 0. Not sure how to write it. Can someone give me a good example and explain why it is done that way?
Do not use Try Catch to test a textbox value. A try catch should only be used for situations that you can't predict and or correct programmatically. You need to use a validation tool or just check the text with the IsNumber function and > 0 then reload the page with a label indicating error if not. I will post more if this isn't clear to you but look into Validation tools. I think that's your best approach. However; I do not know if there are validation tools pre-built to test what you want. You may have to do a little customization or just postback the page and check the value in code on the server side.
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