CapDemo.GUI.ViewQuestionInCatalogue.txt_SearchCatalogue_TextChanged C# (CSharp) Method

        private void txt_SearchCatalogue_TextChanged(object sender, EventArgs e)
        {
            //QuestionBL questionBL = new QuestionBL();
            //List<DO.Question> ListQuestion = questionBL.GetQuestion();

            QuestionBL QuestionBL = new QuestionBL();
            Catalogue Cat = new Catalogue();
            Cat.IDCatalogue = IDCat;
            List<DO.Question> QuestionList;
            QuestionList = QuestionBL.GetQuestionByCatalogue(Cat);
            //if (QuestionList != null)
                //dgv_Question1.DataSource = QuestionList;
            //loadQuestion();
            ListtoDataTableConverter converter = new ListtoDataTableConverter();
            DataTable dt = converter.ToDataTable(QuestionList);

            dgv_Question1.DataSource = dt;
            dt.DefaultView.RowFilter = string.Format("NameQuestion LIKE '%{0}%' or TypeQuestion LIKE '%{0}%' or NameCatalogue LIKE '%{0}%' or QuestionTitle LIKE '%{0}%'or Sequence LIKE '%{0}%'", txt_SearchCatalogue.Text);

            dgv_Question1.Columns["IDCatalogue"].Visible = false;
            dgv_Question1.Columns["IDQuestion"].Visible = false;
            dgv_Question1.Columns["IDCatalogue"].Visible = false;
            dgv_Question1.Columns["AnswerContent"].Visible = false;
            dgv_Question1.Columns["AnswerList"].Visible = false;
            dgv_Question1.Columns["Date"].Visible = false;

            dgv_Question1.Columns["Sequence"].HeaderText = "STT";
            dgv_Question1.Columns["NameQuestion"].HeaderText = "Tên Câu Hỏi";
            dgv_Question1.Columns["NameCatalogue"].HeaderText = "Tên chủ Đề";
            dgv_Question1.Columns["TypeQuestion"].HeaderText = "Loại Câu hỏi";

            dgv_Question1.Columns["Sequence"].ReadOnly = true;
            dgv_Question1.Columns["NameQuestion"].ReadOnly = false;
            dgv_Question1.Columns["NameCatalogue"].ReadOnly = true;
            dgv_Question1.Columns["TypeQuestion"].ReadOnly = true;

            dgv_Question1.Columns["Sequence"].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
            dgv_Question1.Columns["NameCatalogue"].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
            dgv_Question1.Columns["TypeQuestion"].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
        }