//Menu editar
 private void editarEmailsToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (Application.OpenForms.OfType <frmManterEmail>().Count() > 0)
     {
         MessageBox.Show("Formulario manutenção de emails já está aberto!", "Aviso");
     }
     else
     {
         frmManterEmail telaManterEmails = new frmManterEmail();
         telaManterEmails.ShowDialog();
     }
 }
Exemple #2
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 //Menu editar
 private void editarEmailsToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (Application.OpenForms.OfType<frmManterEmail>().Count() > 0)
     {
         MessageBox.Show("Formulario manutenção de emails já está aberto!", "Aviso");
     }
     else
     {
         frmManterEmail telaManterEmails = new frmManterEmail();
         telaManterEmails.ShowDialog();
     }
 }