Params prameter, is giving error while accesing.

Question

namespace ParamsCheck

{

   class Program

   {

      public void Method(params int [] arr)

      {

      arr[1]=Convert.ToInt32( Console.ReadLine());

      }

      static void Main(string[] args)

      {

      Program obj = new Program();

      //int[] arr = new int[1];

      int []arr= {1 };

      obj.Method();

      Console.Read();

      }

   }

}

 

 

 I am getting this error.