How to validate my textbox in vb.net for windows application?

Question

i want validate my textbox in vb.net for windows application.....it could be accept only strings if user enter any numbers in textbox ...it will show error..what is the code for this ..

karthick babu · Answer

Wrtie this code in text box key press event. It allows only characters and backspace only. Then set error provider control to show the errors while pressing other than strings. Try If e.KeyChar = vbBack Then Return If Not Char.IsLetter(e.KeyChar) Then e.KeyChar = Nothing Catch ex As Exception MessageBox.Show(ex.Message) End Try Hope it helps

ms44cn · Answer

If you need complex functions you 'd better refer to Microsoft Enterprise Library . It contain a Invalidation Block.

Alistair Thrussell · Answer

You can always do something like this: private void textBox1_KeyPress(object sender KeyPressEventArgs e) { String allowedChars = abcdefghijklmnopqrstuvwxyz; if(allowedChars.IndexOf(e.KeyChar.ToString().ToLower()) != -1) { e.Handled = true; } }