Csharp/CSharp Tutorial/ADO.Net/DataTableCollection

Filter DataTableCollection: criteria and sort

<source lang="csharp">using System; using System.Data; using System.Data.SqlClient; class MainClass {

  static void Main(string[] args)
  {
     string connString = @"server = .\sqlexpress;integrated security = true;database = northwind";
     string sql1 = @"select * from customers";
     string sql2 = @"select * from products where unitprice < 10";
     string sql = sql1 + sql2;
     SqlConnection conn = new SqlConnection(connString);
     try
     {
        SqlDataAdapter da = new SqlDataAdapter();
        da.SelectCommand = new SqlCommand(sql, conn);
        DataSet ds = new DataSet();
        da.Fill(ds, "customers");
        DataTableCollection dtc = ds.Tables;
        Console.WriteLine("CompanyName".PadRight(20) +"ContactName".PadLeft(23) + "\n");
        string fl = "country = "Germany"";
        string srt = "companyname asc";
        foreach (DataRow row in dtc["customers"].Select(fl, srt))
        {
          Console.WriteLine("{0}\t{1}",
             row["CompanyName"].ToString().PadRight(25),
             row["ContactName"]);
        }
        Console.WriteLine("ProductName".PadRight(20) +"UnitPrice".PadLeft(21));
        foreach (DataRow row in dtc[1].Rows)
        {
           Console.WriteLine("{0}\t{1}",
              row["productname"].ToString().PadRight(25),
              row["unitprice"]);
        }
     }
     catch(Exception e)
     {
        Console.WriteLine("Error: " + e);
     }
     finally
     {
        conn.Close();
     }
  }

}</source>