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this.Visible = false;
FrmMain fm = new FrmMain();
fm.Show();
private void FrmMain_FormClosed(object sender, FormClosedEventArgs e)
{
Application.OpenForms["Form1"].Close();
}
this.Visible = false;
FrmMain fm = new FrmMain();
fm.Closed+= abc;
fm.Show();
private void abc(object sndr, EventArgs param)
{
this.Close();
}