how to update or insert new value in manually created data table other than editing the code #peace

// add columns in the Region table          
            DataColumn col = new DataColumn("RegionID", typeof(int));
            regiontable.Columns.Add(col);
            col = new DataColumn("RegionDescription");
            regiontable.Columns.Add(col);

            // add columns in the Territory table
            col = new DataColumn("TerritoryID", typeof(int));
            territorytable.Columns.Add(col);
            col = new DataColumn("TerritoryDescription");
            territorytable.Columns.Add(col);
            col = new DataColumn("RegionID", typeof(int));
            territorytable.Columns.Add(col);

            // add the two tables to the dataset
            RegionsTerritories.Tables.Add(regiontable);
            RegionsTerritories.Tables.Add(territorytable);

            // add some rows in the region table
            DataRow row = RegionsTerritories.Tables["RegionTable"].NewRow();
            row[0] = 3;
            row[1] = "region 3";
            RegionsTerritories.Tables["RegionTable"].Rows.Add(row);

            row = RegionsTerritories.Tables["RegionTable"].NewRow();
            row[0] = 2;
            row[1] = "region 2";
            RegionsTerritories.Tables["RegionTable"].Rows.Add(row);

            // add some rows in the Territory table
            row = RegionsTerritories.Tables["TerritoryTable"].NewRow();
            row[0] = 44122;
            row[1] = "terri 44122";
            row[2] = 3;
            RegionsTerritories.Tables["TerritoryTable"].Rows.Add(row);

            row = RegionsTerritories.Tables["TerritoryTable"].NewRow();
            row[0] = 53404;
            row[1] = "terri 53404";
            row[2] = 3;
            RegionsTerritories.Tables["TerritoryTable"].Rows.Add(row);

            row = RegionsTerritories.Tables["TerritoryTable"].NewRow();
            row[1] = "terri 60601";
            row[2] = 2;
            row[0] = 60601;
            RegionsTerritories.Tables["TerritoryTable"].Rows.Add(row);

            row = RegionsTerritories.Tables["TerritoryTable"].NewRow();
            row[0] = 94105;
            row[1] = "terri 94105";
            row[2] = 2;
            RegionsTerritories.Tables["TerritoryTable"].Rows.Add(row);          

            // set up ParentBS and ChildBS and filteredChildBS
            parentBS.DataSource = RegionsTerritories;
            parentBS.DataMember = "RegionTable";

            childBS.DataSource = RegionsTerritories;
            childBS.DataMember = "TerritoryTable";

            filteredChildBS.DataSource = RegionsTerritories;
            filteredChildBS.DataMember = "TerritoryTable";

            // bind the regionComboBoxColumn to the parentBS
            this.regionComboBoxColumn.DataSource = parentBS;
            this.regionComboBoxColumn.DisplayMember = "RegionDescription";
            this.regionComboBoxColumn.ValueMember = "RegionID";

            // bind the territoryComboBoxColumn to the childBS
            this.territoryComboBoxColumn.DataSource = childBS;
            this.territoryComboBoxColumn.DisplayMember = "TerritoryDescription";
            this.territoryComboBoxColumn.ValueMember = "TerritoryID";

            // Bound to a datatable
            DataTable dtViewData = new DataTable("ViewData");
            dtViewData.Columns.Add("RegionID", typeof(Int32));
            dtViewData.Columns.Add("TerritoryID", typeof(Int32));
            DataRow dr = dtViewData.NewRow();
            dr["RegionID"] = 3;
            dr["TerritoryID"] = 44122;
            dtViewData.Rows.Add(dr);
            dr = dtViewData.NewRow();
            dr["RegionID"] = 2;
            dr["TerritoryID"] = 60601;
            dtViewData.Rows.Add(dr);

            dataGridView1.AutoGenerateColumns = false;
            dataGridView1.DataSource = dtViewData;
            dataGridView1.Columns[0].DataPropertyName = "RegionID";
            dataGridView1.Columns[1].DataPropertyName = "TerritoryID";