public bool checkChildFrmExist(string childFrmName)
{
foreach (Form childFrm in this.ParentForm.MdiChildren)
{
if (childFrm.Text == childFrmName)
{
childFrm.Activate();
return true;
}
}
return false;
}
private void button1_Click(object sender, EventArgs e)
{
if (this.checkChildFrmExist("Form2") == true)
{
return;
}
Form2 f2 = new Form2();
f2.MdiParent = this.MdiParent;
f2.Show();
}