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private void Form1_Load(object sender, EventArgs e)
{
frm=new Form2();
frm.TopLevel = false;
frm.Show();
this.panel1.Controls.Add(frm);
this.panel1.Resize+=new EventHandler(panel1_Resize);
}
Form2 frm;
private void panel1_Resize(object sender, EventArgs e)
{
if (frm != null)
{
frm.Size = this.panel1.Size;
}
}