private void emailCredentialsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            EmailCredential childform = new EmailCredential();

            childform.MdiParent = this;
            childform.Show();
        }
 private void btn_emailCreden_Click(object sender, EventArgs e)
 {
     EmailCredential eCredential = new EmailCredential();
     eCredential.ShowDialog();
 }