Write a program in C# Sharp to check whether a given matrix is an Identity Matrix

//In a square matrix if all the main diagonal elements are 1's and 
//all the remaining elements are 0's is called an Identity Matrix.
using System;
class Exercise31 
{
    public static void Main()
    {
      	int[,] arr1 = new int[50,50];
        int i, j, r1,c1;
	   Console.Write("\n\n Check whether a given matrix is an Identity Matrix :\n ");
       Console.Write("-----------------------------------------------------------\n");   
     Console.Write(" Input the orders(2x2, 3x3, ...) of square matrix : ");
	 r1 = Convert.ToInt32(Console.ReadLine());
	 c1=r1;
	 Console.Write(" Input elements in the matrix :\n");
       for(i=0;i<r1;i++)
        {
            for(j=0;j<c1;j++)
            {
	           Console.Write(" element - [{0}],[{1}] : ",i,j);
	           arr1[i,j] = Convert.ToInt32(Console.ReadLine());  
            }
        } 	
 	 Console.Write(" The matrix is :\n");
	 for(i=0;i<r1;i++)
	 {
	   for(j=0;j<c1 ;j++)
	     Console.Write(" {0}  ",arr1[i,j]);
	    Console.Write("\n");
	 }
        for (i = 0; i < r1; i++)
        {
            for (j = 0; j < c1; j++)
            {
                if ((i == j && arr1[i, j] != 1) || (i != j && arr1[i, j] != 0))
                {
                    goto label;
                }
            }              
        }
    Console.WriteLine(" The matrix is an Identity Matrix.\n\n");
    return;
label:
    Console.WriteLine("\n The matrix is not an Identity Matrix\n\n");
    }
}