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Deleting 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(                 @"Data Source=.\SQLEXPRESS;" +                 @"AttachDbFilename='NORTHWND.MDF';" +                 @"Integrated Security=True;Connect Timeout=30;User Instance=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("1");       findRow.Delete();       int rowsAffected = thisAdapter.Update(thisDataSet, "Customers");             Console.WriteLine("Deleted {0} rows.", rowsAffected);       Console.WriteLine(thisDataSet.Tables["Customers"].Rows.Count);       thisConnection.Close();     }   }