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Put this code snippet your TextBox KeyPress Event, you will have your Number Only TextBox Working.

private void numberOnlyTextBox1_KeyPress(object sender, KeyPressEventArgs e)
{
 //allow digits only
 if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && e.KeyChar != '.')
 {
   e.Handled = true;
 }

 // allow one decimal point
 if (e.KeyChar == '.' && (sender as TextBox).Text.IndexOf('.') > -1)
 {
  e.Handled = true;
 }
}

Thanks
A Rahim Khan