Write a program in C# Sharp to calculate determinant of a 3 x 3 matrix

using System;  
public class Exercise28 
{  
    public static void Main()
   {
            int i,j;
        	int[,] arr1 = new int[10,10];
            int det=0;
       Console.Write("\n\nCalculate the determinant of a 3 x 3 matrix :\n");
       Console.Write("-------------------------------------------------\n");  
	 Console.Write("Input elements in the matrix :\n");
       for(i=0;i<3;i++)
        {
            for(j=0;j<3;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<3;i++)
	 {
	   for(j=0;j<3 ;j++)
	     Console.Write("{0}  ",arr1[i,j]);
	    Console.Write("\n");
	 }
  for(i=0;i<3;i++)
      det = det + (arr1[0,i]*(arr1[1,(i+1)%3]*arr1[2,(i+2)%3] - arr1[1,(i+2)%3]*arr1[2,(i+1)%3]));

  Console.Write("\nThe Determinant of the matrix is: {0}\n\n",det);
  }
}