Finding Data : DataSet « Database « C# / C Sharp

Finding Data

using System;
using System.Data;
using System.Data.SqlClient; 
using System.Collections.Generic;
using System.Text;

class Program {
    static void Main(string[] args) {
        SqlConnection thisConnection = new SqlConnection(
             @"Server=(local)\sqlexpress;Integrated Security=True;" +
        SqlDataAdapter thisAdapter = new SqlDataAdapter("SELECT CustomerID, CompanyName FROM Customers", thisConnection);
        SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter);

        DataSet thisDataSet = new DataSet();
        thisAdapter.Fill(thisDataSet, "Customers");
        Console.WriteLine("# rows before change: {0}",thisDataSet.Tables["Customers"].Rows.Count);

        DataColumn[] keys = new DataColumn[1];
        keys[0] = thisDataSet.Tables["Customers"].Columns["CustomerID"];
        thisDataSet.Tables["Customers"].PrimaryKey = keys;

        DataRow findRow = thisDataSet.Tables["Customers"].Rows.Find("AAA");

        if (findRow == null) {
            DataRow thisRow = thisDataSet.Tables["Customers"].NewRow();
            thisRow["CustomerID"] = "AAA";
            thisRow["CompanyName"] = "AAA Ltd.";
            if ((findRow = thisDataSet.Tables["Customers"].Rows.Find("AAA")) != null) {
        } else {
            Console.WriteLine("AAA already present in database");
        thisAdapter.Update(thisDataSet, "Customers");
        Console.WriteLine("# rows after change: {0}",thisDataSet.Tables["Customers"].Rows.Count);


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