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this.IsMdiContainer = true;
private void aToolStripMenuItem_Click(object sender, EventArgs e)
{
Form2 f = new Form2();
f.MdiParent= this;
f.Show();
}
private void bToolStripMenuItem_Click(object sender, EventArgs e)
{
Form4 f = new Form4();
f.MdiParent = this;
f.Show();
}
private void button1_Click(object sender, EventArgs e)
{
foreach (Form frm in this.MdiChildren)
{
frm.Close();
}
}
private void button1_Click(object sender, EventArgs e)
{
foreach (Form frm in this.MdiChildren)
{
frm.Close();
}
}