Create a 2GB file instantaneously : C#

 using System;  
 using System.Collections.Generic;  
 using System.Globalization;  
 using System.IO;  
 using System.Linq;  
 using System.Text;  
 using System.Threading.Tasks;  
 using System.Text.RegularExpressions;  
 namespace ConsoleApplication3  
 {  
   class Program  
   {  
     static void Main(string[] args)  
     {  
       // Create a file of size 2 GB instantaneously (for testing purposes)  
       FileStream fs = new FileStream(@"D:\huge_dummy_file", FileMode.CreateNew);  
       fs.Seek(2048L * 1024 * 1024, SeekOrigin.Begin);  
       fs.WriteByte(0);  
       fs.Close();  
     }  
   }  
 }