How to filter textbox input to numeric only?

Question

How do I suppress all data except numeric?

This is not working on KeyDown():

If e.KeyData < Keys.D0 Or e.KeyData > Keys.D9 Then
          


        

Answer 1

The purpose of your function could help provide additional solutions. Checking for a numeric value on each KeyPress is likely overkill. Then you have to overkill it more by accounting for backspace, delete, copy, paste, etc.

For example, if you are storing a telephone number, you should use the "IsNumeric" function on the validate and update step. Alternatively, if you are selecting quantity of an item "NumericUpDown" control would be more appropriate than a TextBox.