C#: Find the size of a specified file in bytes

Last update on June 23 2025 12:58:46 (UTC/GMT +8 hours)

File Size in Bytes

Write a C# program to find the size of a specified file in bytes.

Sample Solution:-

C# Sharp Code:

using System;
using System.Collections.Generic;
using System.IO; // Importing the System.IO namespace for file handling

// This is the beginning of the Exercise29 class
public class Exercise29 {
    // This is the main method where the program execution starts
    public static void Main() {
        // Creating a FileInfo object representing a file at the specified path
        FileInfo f = new FileInfo("/home/students/abc.txt");

        // Displaying the size of the file in bytes using FileInfo's Length property
        Console.WriteLine("\nSize of a file: " + f.Length.ToString());
    }
}

Sample Output:

Size of a file: 31 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C# program to calculate the combined size of all files in a directory in bytes.
• Write a C# program to determine the size in bytes of a text file excluding whitespace characters.
• Write a C# program to compress a text file and show its size before and after compression.
• Write a C# program to read a file and report its size in kilobytes and megabytes as well.

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