private void btnAddParent_Click(object sender, EventArgs e) { int selectedRow = dataGridStudents.CurrentCell.RowIndex; int studentID = int.Parse( dataGridStudents.Rows[selectedRow].Cells[0].Value.ToString()); AddNewParentWindow wnd = new AddNewParentWindow(studentID); wnd.FormClosed += (o, s) => { parentsListDataGridView.DataSource = StudentDAL.GetStudentParents(studentID); }; wnd.ShowDialog(); }