hi,
  As you must have guessed i am new to VB.Net.All iwanted to ask you is that i want to put the check on integer e.g if user passed "awais" then he shouldnt pass 123 with it.Means he shouldnt pass "awais123".I can put the check on simple Integer value but if passed together with string .How can i chekc it.
Thanks

I'm not too sure I understand your question(s).

To perform a simple check to verify whether a textbox contains ALL integers use:

Dim check As String = TextBox1.Text
If IsNumeric(check) Then
            'code here
End If

If the user is entering a fixed format ID number or something like that and you wanted to check whether the last three characters were integers, you might use the substring property:

Dim check As String = TextBox1.Text
If IsNumeric(check.Substring(check.Length - 3, 3)) Then
            'code here
End If

This code would check the last three characters of the textbox were integers.

Hi,
   Thanks alot.The substring method has helped me solved my problem.thanks again.
  awais