How do I fetching the selected row selected value from datatable and display it in textbox...

private void GetRowsByFilter()
        {
            var DataSet1 = new DataSet();

            var table1 = new DataTable("Orders");
            DataSet1.Tables.Add(table1);
            var table = DataSet1.Tables["Orders"];
            table.Columns.Add(new DataColumn { Caption = "Transction type", ColumnName = "Transctiontype", DataType = typeof(string) });
            table.Columns.Add(new DataColumn { Caption = "Transaction category", ColumnName = "Transactioncategory", DataType = typeof(string) });
            table.Columns.Add(new DataColumn { Caption = "Date", ColumnName = "Date", DataType = typeof(DateTime) });
            table.Columns.Add(new DataColumn { Caption = "Amount", ColumnName = "Amount", DataType = typeof(int) });
            table.Columns.Add(new DataColumn { Caption = "Vendor", ColumnName = "Vendor", DataType = typeof(string) });


            var newRw = table.NewRow();
            newRw["Transctiontype"] = "Life style";
            newRw["Date"] = DateTime.Now;
            newRw["Amount"] = 1000;
            newRw["Vendor"] = "Net play";
            table.Rows.Add(newRw.ItemArray);

            newRw = table.NewRow();
            newRw["Transctiontype"] = "Non Life style";
            newRw["Date"] = DateTime.Now;
            newRw["Amount"] = 15000;
            newRw["Vendor"] = "Microsoft";
            table.Rows.Add(newRw.ItemArray);

            newRw = table.NewRow();
            newRw["Transctiontype"] = "Life style";
            newRw["Date"] = DateTime.Now;
            newRw["Amount"] = 15000;
            newRw["Vendor"] = "CodeProject";
            table.Rows.Add(newRw.ItemArray);

            string expression;

            expression = "Amount = 1000 and Transctiontype = 'Life style' and vendor = 'Net play'";
            DataRow[] foundRows;

            foundRows = table.Select(expression);

            if (foundRows.Any())
            {
                //textbox.text = foundRows[0].ItemArray[0]
            }
        }