Fibonacci Series in C#

using System;  
  public class Fibonacci
   {  
     public static void Main(string[] args)  
      {  
         int n1=0,n2=1,n3,i,num;    
         Console.Write("Enter the Number of Elements: ");    
         num = int.Parse(Console.ReadLine());  
         Console.Write(n1+" "+n2+" "); 
         for(i=2;i<number;++i) 
         {    
          n3=n1+n2;    
          Console.Write(n3+" ");    
          n1=n2;    
          n2=n3;    
         }    
      }  
   }  

Output:

Enter the Number of Elements: 7
0 1 1 2 3 5 8 

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