Execute Scalar with SqlCommand : SqlCommand « ADO.Net « C# / CSharp Tutorial

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();
    }
  }

32.18.SqlCommand
	32.18.1.	Create a SqlCommand
	32.18.2.	Create SqlCommand with both sql query and connection
	32.18.3.	SqlCommand: AutoClose
	32.18.4.	Execute two sql commands
	32.18.5.	Asynchronous Processing Sql command
	32.18.6.	Start process of retrieving a data reader asynchronously, check the IsCompleted property value.
	32.18.7.	SqlCommand with Callback Handler
	32.18.8.	Add parameters to the SqlCommand
	32.18.9.	SQL StoredProcedure
	32.18.10.	Execute Scalar with SqlCommand
	32.18.11.	Execute the scalar SQL statement and store results
	32.18.12.	Executing a Parameterized Query with SqlCommand
	32.18.13.	Batch Update Demo
	32.18.14.	Execute update statement with SqlCommand against MDF file
	32.18.15.	Executing a Query That Returns a Single Value
	32.18.16.	Async Command Object Demo