i need help for exeption handeling....

int[] vertex;
        int[,] AMatrix;
        int[,] AdjacencyMatrix;
        int Length;

        public void SetVertex()
        {
            Console.WriteLine("Please enter the number of vertices");
            int n = Convert.ToInt32(Console.ReadLine());
            while (n < 2)
            {
                Console.WriteLine("You must enter a number greater than 1\n plz enter another one:");
                n = Convert.ToInt32(Console.ReadLine());
            }
            vertex = new int[n];
            for (int i = 0; i <= n-1; i++)
                vertex[i] = i;
        }
        public void SetEdges()
        {
            AdjacencyMatrix = new int[vertex.Length, vertex.Length];
            for (int i = 0; i < vertex.Length; i++)
                for (int j = 0; j < vertex.Length; j++)
                    AdjacencyMatrix[i, j] = 0;

            Console.WriteLine("please enter the number of the edges:");
            int e = Convert.ToInt32(Console.ReadLine());

            for (int i = 0; i < e; i++)
            {
                Console.WriteLine("from ");
                int s = 0;
                s = Convert.ToInt32(Console.ReadLine());
                   
                Console.WriteLine("to ");
                int d = 0;
                d = Convert.ToInt32(Console.ReadLine());
                AdjacencyMatrix[s, d] = 1; // <<-------- Exception happens here
            
        }