private void itmExit_Click(object sender, System.EventArgs e)
{
int mdiChildrenLenght = this.MdiChildren.Length;
if (mdiChildrenLenght != 0)
{
for (int i = 0; i < mdiChildrenLenght; i++)
{
TextForm documentForm = (TextForm)ActiveMdiChild;
documentForm.Close();
}
}
System.Windows.Forms.Application.Exit();
}