AEMManager.AemInstanceDialog.validate_EnsureNumber C# (CSharp) Method

        private void validate_EnsureNumber(object sender, CancelEventArgs e)
        {
            int outValue;
              TextBox text = (TextBox)sender;
              if (!int.TryParse(text.Text, out outValue)) {
            MessageBox.Show(this, "Invalid number: " + text.Text, "Invalid number", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            e.Cancel = true;
              }
        }