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This will only allow numbers to be entered into a textbox control. You can allow apply the codes to a combobox controls edit box. This works with VB.NET and VB 2005, VB 2008, and Visual Basic 2010.
'Allow only numbers when someone types in a textbox control ' 'Add a textbox to the form and name is: txt . Then put the following ' 'Code needs to be in the Textbox_KeyPress event of the textbox control. If e.KeyChar.IsNumber(e.KeyChar) = False Then e.Handled = True End If