public static FrmHoliday GetSingleton()
{
if (frm == null || frm.IsDisposed)
{
frm = new FrmHoliday();
}
return(frm);
}
private void tsmiHoliday_Click(object sender, EventArgs e)
{
FrmHoliday frm = FrmHoliday.GetSingleton();
frm.MdiParent = this;
frm.Show();
frm.Activate();
}
private void FrmHoliday_FormClosed(object sender, FormClosedEventArgs e)
{
frm = null;
}