Display BMP File Width and Height using BinaryReader in C#

using System;
using System.IO;

class BMPDimensions
{
    // Main method that runs the program
    static void Main(string[] args)
    {
        // Ask the user for the name of the BMP file
        Console.WriteLine("Please enter the name of the BMP file:");

        // Read the name of the BMP file from the user
        string fileName = Console.ReadLine();

        try
        {
            // Open the file in binary mode using BinaryReader
            using (BinaryReader reader = new BinaryReader(File.Open(fileName, FileMode.Open)))
            {
                // Check if the file starts with "BM" (this indicates it's a BMP file)
                reader.BaseStream.Seek(0, SeekOrigin.Begin); // Move to the start of the file
                byte[] fileType = reader.ReadBytes(2); // Read the first two bytes

                // If the file type is not "BM", it's not a valid BMP file
                if (fileType[0] != 0x42 || fileType[1] != 0x4D)
                {
                    Console.WriteLine("This is not a valid BMP file.");
                    return;
                }

                // Read the width (bytes 18-21)
                reader.BaseStream.Seek(18, SeekOrigin.Begin);
                int width = reader.ReadInt32(); // Read the width value

                // Read the height (bytes 22-25)
                reader.BaseStream.Seek(22, SeekOrigin.Begin);
                int height = reader.ReadInt32(); // Read the height value

                // Display the width and height of the BMP image
                Console.WriteLine($"Width: {width} pixels");
                Console.WriteLine($"Height: {height} pixels");
            }
        }
        catch (FileNotFoundException)
        {
            // Handle file not found error
            Console.WriteLine("Error: The specified BMP file could not be found.");
        }
        catch (Exception ex)
        {
            // Handle other unexpected errors
            Console.WriteLine("An error occurred: " + ex.Message);
        }
    }
}

 Output

//If the user enters image.bmp, and the file contains the following data at the relevant positions:
Width: 800 pixels (position 18-21)
Height: 600 pixels (position 22-25)

//The output would be:
Please enter the name of the BMP file:
image.bmp
Width: 800 pixels
Height: 600 pixels