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Save data stored in table to xml file

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 qry = @"select productname,unitprice from products";       SqlConnection conn = new SqlConnection(connString);       try       {          SqlDataAdapter da = new SqlDataAdapter();          da.SelectCommand = new SqlCommand(qry, conn);          conn.Open();          DataSet ds = new DataSet();          da.Fill(ds, "products");          ds.WriteXml(@"c:\productstable.xml");       }       catch(Exception e)       {          Console.WriteLine("Error: " + e);       }       finally       {          conn.Close();       }    } }