The Program in C# Program to Create an Identity Matrix is given below:

using System;

namespace IdentityMatrix
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello Codeauri Family, enter the size of the identity matrix :");
            int size = int.Parse(Console.ReadLine());
            int[,] matrix = CreateIdentityMatrix(size);
            PrintMatrix(matrix);
        }

        static int[,] CreateIdentityMatrix(int size)
        {
            int[,] matrix = new int[size, size];
            for (int i = 0; i < size; i++)
            {
                for (int j = 0; j < size; j++)
                {
                    if (i == j)
                    {
                        matrix[i, j] = 1;
                    }
                    else
                    {
                        matrix[i, j] = 0;
                    }
                }
            }
            return matrix;
        }

        static void PrintMatrix(int[,] matrix)
        {
            int size = matrix.GetLength(0);
            for (int i = 0; i < size; i++)
            {
                for (int j = 0; j < size; j++)
                {
                    Console.Write(matrix[i, j] + " ");
                }
                Console.WriteLine();
            }
        }
    }
}

Output:

Hello Codeauri Family, enter the size of the identity matrix :

1 0 0
0 1 0
0 0 1

Pro-Tips💡

Here are the step by step execution of above program:

1. The using System directive at the top of the file includes the System namespace in the program, which provides access to various system-level functions, including the Console class used in this code.
2. The code defines a namespace IdentityMatrix that encapsulates all of the code in the program.
3. The Program class contains the program’s main method, Main, which is the entry point of the program.
4. In the Main method, the program prompts the user to enter the size of the identity matrix by writing a message to the console. The size is then read from the console and stored in the size variable.
5. The CreateIdentityMatrix method is then called with the size parameter. This method returns an identity matrix of the specified size, which is stored in the matrix variable.
6. The PrintMatrix method is then called with the matrix parameter, which prints the contents of the matrix to the console, row by row.
7. The CreateIdentityMatrix method initializes a two-dimensional integer array matrix of the specified size and sets the diagonal elements to 1 and the rest to 0. This is done by using nested for loops to iterate over the rows and columns of the array. If the row and column indices are equal (i == j), the current element is set to 1, otherwise it is set to 0.
8. The PrintMatrix method prints the contents of the matrix to the console, row by row. This is done by using nested for loops to iterate over the rows and columns of the matrix and printing the elements, separated by a space. After each row is printed, a line break is added to separate the rows.