private void button2_Click(object sender, EventArgs e)
        {
            int IDBaiQC = Int16.Parse(this.textID.Text);

            Views.CreateDoiTac CreateDoiTac = new Views.CreateDoiTac(this, IDBaiQC)
            {
                StartPosition = FormStartPosition.CenterParent
            };
            CreateDoiTac.ShowDialog();
        }
        private void listDoiTac_SelectedIndexChanged(object sender, EventArgs e)
        {
            int index = this.listDoiTac.FocusedItem.Index;

            if (index == this.selectedDoiTacIndex)
            {
                this.selectedDoiTacIndex = -1;
                return;
            }
            this.selectedDoiTacIndex = index;
            Views.CreateDoiTac detailForm = new Views.CreateDoiTac(index, this.dataDoiTac[index], this)
            {
                StartPosition = FormStartPosition.CenterParent
            };
            detailForm.ShowDialog();
        }