public static FRM_Calculo Instance()
{
if (instance == null)
{
instance = new FRM_Calculo();
}
return(instance);
}
private void mCalcular_Click(object sender, EventArgs e)
{
for (int intIndex = Application.OpenForms.Count - 1; intIndex > 0; intIndex--)
{
if (Application.OpenForms[intIndex] != this)
{
Application.OpenForms[intIndex].Close();
}
}
FRM_Calculo form_calculo = new FRM_Calculo();
form_calculo.MdiParent = this;
form_calculo.Show();
}