Csharp/C Sharp/Language Basics/Using

Demonstrate using statement

<source lang="csharp"> /* C#: The Complete Reference by Herbert Schildt Publisher: Osborne/McGraw-Hill (March 8, 2002) ISBN: 0072134852

• /

// Demonstrate using statement.

using System; using System.IO;

public class UsingDemo {

 public static void Main() { 
   StreamReader sr = new StreamReader("test.txt"); 

   // Use object inside using statement. 
   using(sr) { 
     Console.WriteLine(sr.ReadLine()); 
     sr.Close(); 
   } 

   // Create StreamReader inside the using statement. 
   using(StreamReader sr2 = new StreamReader("test.txt")) { 
     Console.WriteLine(sr2.ReadLine()); 
     sr2.Close(); 
   } 
 } 

}

      </source>

This version does not include the using System statement

<source lang="csharp"> /* C#: The Complete Reference by Herbert Schildt Publisher: Osborne/McGraw-Hill (March 8, 2002) ISBN: 0072134852

• /

// This version does not include the using System statement.

public class ExampleConsoleWriteLine {

 // A C# program begins with a call to Main(). 
 public static void Main() { 

   // Here, Console.WriteLine is fully qualified. 
   System.Console.WriteLine("A simple C# program."); 
 } 

}

      </source>