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Discussion :: Properties

If a class Student has an indexer, then which of the following is the correct way to declare this indexer to make the C#.NET code snippet given below work successfully?

  Student s = new Student();
  s[1, 2] = 35;

 class Student
 {   
    int[ ] a = new int[5, 5]; 
    public property WriteOnly int this[int i, int j]  
   {        
        set      
        {        
            a[i, j] = value;       
        }          
     }
   }

class Student 
{   
    int[ , ] a = new int[5, 5];  
    public int property WriteOnly   
    {        
           set    
           {            
            a[i, j] = value;        
           }     
      } 
  }

 class Student
 {    
    int[ , ] a = new int[5, 5]; 
    public int this[int i, int j]    
    {       
        set     
        {         
           a[i, j] = value;   
        }   
     }  
  }



 class Student
 {   
     int[ , ] a = new int[5, 5];    
     int i, j;     
     public int this     
     {          
          set         
          {            
             a[i, j] = value;      
          }
          
        }  
     }