private void SaveButton_Click(object sender, EventArgs e)
 {
     if (PhoneTextBox.Text == "" || CompanyIDMaskedTextBox.Text == "" || AddressTextBox.Text == "" || EmailTextBox.Text == "")
     {
         MessageBox.Show("Insert All Fields");
     }
     else
     {
         string PhoneNum = PhoneTextBox.Text;
         int    Error    = 0;
         int    z;
         for (int i = 0; i < PhoneNum.Length; i++)
         {
             z = (int)PhoneNum[i];
             if (z < 40 || z > 57)
             {
                 Error = 1;
                 break;
             }
         }
         if (Error == 0)
         {
             int r = ControllerObject.AddCompany(Convert.ToInt32(CompanyIDMaskedTextBox.Text), CompanyNameMaskedTextBox.Text, AddressTextBox.Text, Convert.ToInt32(PhoneTextBox.Text), EmailTextBox.Text + AtLabel.Text + EmailDomainComboBox.Text + ComLabel.Text);
             if (r != 0)
             {
                 MessageBox.Show(CompanyNameMaskedTextBox.Text + " " + "is Added");
                 Hide();
                 new Admin(Username).Show();
             }
             else
             {
                 MessageBox.Show("Error in Adding" + " " + CompanyNameMaskedTextBox.Text);
                 return;
             }
         }
         else
         {
             MessageBox.Show("Invalid Phone Number! Check Your Entry");
         }
     }
 }