File Operations In C#

This article will explain simple file operations using C# code

This article will explain simple file operations like creating folder, creating file, appending file and deleting file, using C# code.

Here, we will also check if the Folder and File already exist or not. I hope this code will help a bit in your daily programming life as it is most commonly used.

Create console application and replace the code in Program.cs file.

Program.cs file code

using System;
using System.Text;
using System.IO;

namespace FileOperations
{
    class Program
    {
        static void Main(string[] args)
        {
            string folderPath = @"c:\\RKFolder";
            string fileName = "OutputFile.txt";
            string filePath = System.IO.Path.Combine(folderPath, fileName);

            try
            {
                CreateFolder(folderPath);
                CreateFile(filePath, fileName);

                // Adding data to the file
                string message = string.Empty;
                for (byte i = 0; i < 10; i++)
                {
                    message = "Sample Text - " + i;
                    AppendTextToFile(filePath, message);
                }
                Console.WriteLine("\nFile successfully updated on path:\t " + filePath);
                Console.WriteLine("Press Enter to Exit...");
                Console.ReadLine();
            }
            catch (Exception ex)
            {
                Console.WriteLine("Ufff, something went wrong...");
                Console.WriteLine(ex.Message);

                Console.WriteLine("Press Enter to Exit...");
                Console.ReadLine();
            }
        }
        static void AppendTextToFile(string filePath, string message)
        {
            // Open and append the file
            using (System.IO.FileStream fs = new System.IO.FileStream(filePath, FileMode.Append))
            {
                byte[] info = new UTF8Encoding(true).GetBytes(System.Environment.NewLine + message);
                fs.Write(info, 0, info.Length);
            }
        }
        private static void CreateFolder(string folderPath)
        {
            // Create folder if not present
            bool folderExists = Directory.Exists(folderPath);
            if (!folderExists)
                Directory.CreateDirectory(folderPath);
        }

        private static void CreateFile(string filePath, string fileName)
        {
            if (!System.IO.File.Exists(filePath))
            {
                // Create file
                System.IO.FileStream fs = System.IO.File.Create(filePath);
                fs.Close();
            }
            else
            {
                // Delete the file
                Console.WriteLine("File \"{0}\" already exists.", fileName);
                File.Delete(filePath);
                Console.WriteLine("File deleted...");

                // Create the file
                System.IO.FileStream fs = System.IO.File.Create(filePath);
                fs.Close();
                Console.WriteLine("File re-created...");
                return;
            }
        }
    }
}

Execute the project. Given below is the output.