inserting 10 digits number from textbox to sql server 2005 error

[kiki2012]

It try to insert 10 digits number to database sql server through textbox it give me this error.

Here is the code which i use for validation the textbox

Private Sub contacttxt_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles contacttxt.KeyPress
        If (e.KeyChar < Chr(48) Or e.KeyChar > Chr(57)) And e.KeyChar <> Chr(8) Then
            MessageBox.Show("cannot enter char selection only ")
            e.Handled = True

        Else

            If contacttxt.Text.Length >= 10 Then
                If e.KeyChar <> ControlChars.Back Then
                    MsgBox("Only 10 Digit")
                    e.Handled = True
                End If
            End If
        End If
    End Sub