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The dimensions of the two matrices are obtained from the user and its addition is performed by adding corresponding elements.

Here is source code of the C# Program to Perform Matrix Addition. The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

/*
 * C# Program to Perform Matrix Addition 
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace ConsoleApplication8
{
    class Program
    {
        public static void Main(string[] args)
        {
            int m, n,i,j;
            Console.Write("Enter Number Of Rows And Columns Of Matrices A and B : ");
            m = Convert.ToInt16(Console.ReadLine());
            n = Convert.ToInt16(Console.ReadLine());
            int[,] A = new int[10, 10];
            Console.Write("\nEnter The First Matrix : ");
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    A[i, j] = Convert.ToInt16(Console.ReadLine());
                }
            }
 
            int[,] B = new int[10, 10];
            Console.Write("\nEnter The Second Matrix:");
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    B[i, j] = Convert.ToInt16(Console.ReadLine());
                }
            }
            Console.Clear();
            Console.WriteLine("\nMatrix A : ");
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    Console.Write(A[i, j] + "\t");
 
                }
                Console.WriteLine();
            }
            Console.WriteLine("\nMatrix B: ");
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    Console.Write(B[i, j] + "\t");
 
                }
                Console.WriteLine();
            }
            int[,] C = new int[10, 10];
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    C[i, j] = A[i, j] + B[i, j];
                }
            }
            Console.Write("\nSum Matrix :");
            for (i = 0; i < m; i++)
            {
                for (j = 0; j < n; j++)
                {
                    Console.Write(C[i, j] + "\t");
 
                }
                Console.WriteLine();
            }
            Console.Read();
        }
    }
}

This C# program, we are reading the number of rows and columns for matrices A and B using ‘m’ and ‘n’ variables respectively. Using for loop we are entering the coefficient element values for both the matrix A and B using A[i,j] and B[i,j] array variables respectively.

 
Enter Number Of Rows And Columns Of Matrices A and B : 3  3
Enter the First Matrix : 
1 2 3
2 3 4
3 4 5
Enter the Second Matrix :
1 2 3
2 1 4
1 1 5
Matrix A :
1 2 3
2 3 4
3 4 5
Matrix B :
1 2 3
2 1 4
1 1 5
Sum Matrix :
2 4 6
4 4 8
4 5 10

C# Program to Add Two Matrices