private void button2_Click(object sender, EventArgs e)
 {
     if (MessageBox.Show("¿Seguro que desea regresar al formulario anterior?", "",
                         MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
     {
         return;
     }
     else
     {
         this.Dispose();
         casting           = new ContratarCasting();
         casting.MdiParent = this.MdiParent;
         casting.Show();
     }//
 }
 private void button2_Click(object sender, EventArgs e)
 {
     if (MessageBox.Show("¿Seguro que desea regresar al formulario anterior?","",
         MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
     {
         return;
     }
     else
     {
         this.Dispose();
         casting = new ContratarCasting();
         casting.MdiParent = this.MdiParent;
         casting.Show();
     }//
 }