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How can you get the size of a file in bytes?

Ravi Vishwakarma 405 07 May 2025

How can you get the size of a file in bytes? with example.

c# c#file handling
Updated 21 May 2025
Ravi Vishwakarma
Ravi Vishwakarma

IT-Hardware & Networking

Ravi Vishwakarma is a dedicated Software Developer with a passion for crafting efficient and innovative solutions. With a keen eye for detail and years of experience, he excels in developing robust software systems that meet client needs. His expertise spans across multiple programming languages and technologies, making him a valuable asset in any software development project.

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1 Answers

Utpal Vishwas
Utpal Vishwas 21 May 2025
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To get the size of a file in bytes in C#, you can use the FileInfo class from the System.IO namespace.

Example: Get File Size in Bytes

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = @"C:\example\myfile.txt";

        if (File.Exists(filePath))
        {
            FileInfo fileInfo = new FileInfo(filePath);
            long sizeInBytes = fileInfo.Length;

            Console.WriteLine($"File size: {sizeInBytes} bytes");
        }
        else
        {
            Console.WriteLine("File does not exist.");
        }
    }
}

Notes:

  1. FileInfo.Length returns the size in bytes as a long.
  2. Always check if the file exists to avoid exceptions.

Convert to KB/MB (Optional):

double sizeInKB = sizeInBytes / 1024.0;
double sizeInMB = sizeInBytes / (1024.0 * 1024.0);
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