private void btnClose_Click(object sender, EventArgs e)
{
DialogResult dialogResult = MessageBox.Show("¿Esta seguro que desea Salir?",
"Salir", MessageBoxButtons.YesNo);
if (dialogResult == DialogResult.Yes)
{
FormularioAcesso formularioAcesso = new FormularioAcesso();
formularioAcesso.Show();
this.Close();
}
}
public frmPrincipal()
{
InitializeComponent();
bool open = false;
FormularioAcesso formulario = new FormularioAcesso();
foreach (Form frm in Application.OpenForms)
{
if (frm.GetType() == typeof(FormularioAcesso))
{
open = true;
MessageBox.Show("El formulario ya esta abierto");
break;
}
}
if (!open)
{
formulario.MdiParent = this;
formulario.Show();
}
}