Input Field validation (Accept only numbers)

• In this exercise you will learn one of the methods of validating inputs at field level

• Add a new form to project. Name it as frmTextboxvalid.
• Place a Label and  a TextBox. Name the textbox as txtNumbers.
• Click at "View" and then at "Code" to enter the code window.
• Click at the combo box on the left side and select txtNumbers.
• Click at the combo box on the right side and select KeyPress event.
• Then write the following code.

                    Private Sub txtNumbers_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtNumbers.KeyPress


                          If Asc(e.KeyChar) <> 8 Then
                                   If Asc(e.KeyChar) < 48 Or Asc(e.KeyChar) > 57 Then
                                          e.Handled = True
                                  End If
                          End If


                   End Sub

• Run the Application.