CapDemo.GetQuestion.chk_CheckAll_CheckedChanged C# (CSharp) Метод

        private void chk_CheckAll_CheckedChanged(object sender, EventArgs e)
        {
            if (chk_CheckAll.Checked == true)
            {
                foreach (DataGridViewRow row in dgv_Question.Rows)
                {
                    row.Cells["Check"].Value = true;
                }
            }
            else
            {
                foreach (DataGridViewRow row in dgv_Question.Rows)
                {
                    row.Cells["Check"].Value = null;
                }
            }
        }