OpenChild From Thro Mdi Parent

private void Btn_Attendance_Click(object sender, EventArgs e)
{OpenChildForm(new AttendanceModuel());
}

Dashboard Form Code OpenChlidForm(new Attendance Moduel());

private void BtnOpenModuel_Click(object sender, EventArgs e)
{string str = !this.rbtnMorning.Checked ? (!this.rbtnEvening.Checked ? (!this.rbtnMeeting.Checked ? "Special" : "Meeting") : "Evening") : "Morning";new Attendance () { sShift = str }.Show();
}

btnOpenModuel Funtion get 

line 4 open in child form but now form open direct how to openc new attendance form in childForm