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Execute Scalar with SqlCommand

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");       thisConnection.Open();       SqlCommand thisCommand = thisConnection.CreateCommand();       thisCommand.CommandText = "SELECT COUNT(*) FROM Customers";       Object countResult = thisCommand.ExecuteScalar();       Console.WriteLine("Count of Customers = {0}", countResult);       thisConnection.Close();     }   }