how to validation in email id textbox in desktop application

public static bool isEmail(string inputEmail)
{
   if (inputEmail != "")
   {
     string strRegex = @"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
       @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
          @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
          Regex re = new Regex(strRegex);
          if (re.IsMatch(inputEmail))
              return (true);
          else
              return (false);
      }
      return (true);
  }

if (Common.isEmail(txtbx_Email.Text))
           {

else
            {
                MessageBox.Show("Email not valid!", "Save", MessageBoxButton.OK, MessageBoxImage.Warning);
                txtbx_Email.Focus();
                return false;
            }