form validation

[slim]

Ok second question of the day.

Can someone tell me the code I need to validate form entry.
I want a message box to appear if someone attempts to submit details(by clicking a button) if they have left a textbox empty (or put the wrong info in).

Thanks
Andy

 

[Mudface]

There's many ways to do this. As a starter you might try stuff like: -

If TextBox1.Text = "" Then MsgBox ....

If Not IsNumeric(TextBox1.Text) Then MsgBox ...

MaxValue = 1000 ' As an example
If TextBox1.Text > MaxValue Then MsgBox ...

Note you can also restrict what people can actually type into a textbox in the first place with the TextBox_Change() Event.