ช่วยดูให้หน่อยครับผม Select datatable แล้วมันไม่เรียงให้ครับ

private void RefreshData()
        {
            Cursor = Cursors.WaitCursor;
            List<string> _file = new List<string>();
            _file = TORServices.clsFile_Path.GetFilesRecursive(TORServices.clsPathData.Path_AllReport, "*.Report");
            if (_file.Count <= 0) { return; }
            DataTable dt = new DataTable();
            dt.Columns.Add(new DataColumn("SampleID",typeof(string)));
            dt.Columns.Add(new DataColumn("Parameter", typeof(string)));
            dt.Columns.Add(new DataColumn("Value", typeof(string)));
            dt.Columns.Add(new DataColumn("Date", typeof(string)));
            dt.Columns.Add(new DataColumn("ผู้วิเคราะห์", typeof(string)));
            dt.Columns.Add(new DataColumn("Seleced", typeof(Boolean)));
            for(int f = 0;f < _file.Count-1;f++)
            {
                dgvmgKg.DataSource = GetTable("SELECT * FROM `mg_Kg$Print_Area`", _file[f]).DefaultView;
                dgvmgL.DataSource = GetTable("SELECT * FROM `mg_L$Print_Area`", _file[f]).DefaultView;
                for (int i = 0; i < this.dgvmgL.RowCount - 1; i++)
                {
                    if (this.dgvmgL[this.dgvmgL.ColumnCount - 1, i].Value.ToString().Trim().Length != 0)
                    {
                        DataRow dr = dt.NewRow();
                        dr["SampleID"] = this.dgvmgL[this.dgvmgL.ColumnCount - 6, i].Value.ToString().Trim();
                        dr["Parameter"] = this.dgvmgL[this.dgvmgL.ColumnCount - 5, i].Value.ToString().Trim();
                        dr["Value"] = this.dgvmgL[this.dgvmgL.ColumnCount - 4, i].Value.ToString().Trim();
                        dr["Date"] = this.dgvmgL[this.dgvmgL.ColumnCount - 3, i].Value.ToString().Trim();
                        dr["ผู้วิเคราะห์"] = this.dgvmgL[this.dgvmgL.ColumnCount - 2, i].Value.ToString().Trim();
                        dr["Seleced"] = true;
                        dt.Rows.Add(dr);
                       
                    }
                }

                for (int i = 0; i < this.dgvmgKg.RowCount - 1; i++)
                {
                    if (this.dgvmgKg[this.dgvmgKg.ColumnCount - 1, i].Value.ToString().Trim().Length != 0)
                    {
                        DataRow dr = dt.NewRow();
                        dr["SampleID"] = this.dgvmgKg[this.dgvmgKg.ColumnCount - 6, i].Value.ToString().Trim();
                        dr["Parameter"] = this.dgvmgKg[this.dgvmgKg.ColumnCount - 5, i].Value.ToString().Trim();
                        dr["Value"] = this.dgvmgKg[this.dgvmgKg.ColumnCount - 4, i].Value.ToString().Trim();
                        dr["Date"] = this.dgvmgKg[this.dgvmgKg.ColumnCount - 3, i].Value.ToString().Trim();
                        dr["ผู้วิเคราะห์"] = this.dgvmgKg[this.dgvmgKg.ColumnCount - 2, i].Value.ToString().Trim();
                        dr["Seleced"] = true;
                        dt.Rows.Add(dr);
                    }
                } 
            }
            dt.Select("", "SampleID ASC");//ตัวนี้ต้อง select ยังไงครับ
            dataGridView1.DataSource =dt ;
            Cursor = Cursors.Default;
        }