// ... other code ... private void btnAddRecord_Click(object sender, EventArgs e) { addRecord frmAddRecord = new addRecord(); if (frmAddRecord.ShowDialog() == DialogResult.OK) { studentInfo.Add(frmAddRecord.Student); studentInfo.Add(frmAddRecord.Score); lstMarks.Items.Add(frmAddRecord.Student + " : " + frmAddRecord.Score); } }