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

  1. using System;
  2. using System.Text;
  3. using System.IO;
  5. namespace FileOperations
  6. {
  7. class Program
  8. {
  9. static void Main(string[] args)
  10. {
  11. string folderPath = @"c:\\RKFolder";
  12. string fileName = "OutputFile.txt";
  13. string filePath = System.IO.Path.Combine(folderPath, fileName);
  15. try
  16. {
  17. CreateFolder(folderPath);
  18. CreateFile(filePath, fileName);
  20. // Adding data to the file
  21. string message = string.Empty;
  22. for (byte i = 0; i < 10; i++)
  23. {
  24. message = "Sample Text - " + i;
  25. AppendTextToFile(filePath, message);
  26. }
  27. Console.WriteLine("\nFile successfully updated on path:\t " + filePath);
  28. Console.WriteLine("Press Enter to Exit...");
  29. Console.ReadLine();
  30. }
  31. catch (Exception ex)
  32. {
  33. Console.WriteLine("Ufff, something went wrong...");
  34. Console.WriteLine(ex.Message);
  36. Console.WriteLine("Press Enter to Exit...");
  37. Console.ReadLine();
  38. }
  39. }
  40. static void AppendTextToFile(string filePath, string message)
  41. {
  42. // Open and append the file
  43. using (System.IO.FileStream fs = new System.IO.FileStream(filePath, FileMode.Append))
  44. {
  45. byte[] info = new UTF8Encoding(true).GetBytes(System.Environment.NewLine + message);
  46. fs.Write(info, 0, info.Length);
  47. }
  48. }
  49. private static void CreateFolder(string folderPath)
  50. {
  51. // Create folder if not present
  52. bool folderExists = Directory.Exists(folderPath);
  53. if (!folderExists)
  54. Directory.CreateDirectory(folderPath);
  55. }
  57. private static void CreateFile(string filePath, string fileName)
  58. {
  59. if (!System.IO.File.Exists(filePath))
  60. {
  61. // Create file
  62. System.IO.FileStream fs = System.IO.File.Create(filePath);
  63. fs.Close();
  64. }
  65. else
  66. {
  67. // Delete the file
  68. Console.WriteLine("File \"{0}\" already exists.", fileName);
  69. File.Delete(filePath);
  70. Console.WriteLine("File deleted...");
  72. // Create the file
  73. System.IO.FileStream fs = System.IO.File.Create(filePath);
  74. fs.Close();
  75. Console.WriteLine("File re-created...");
  76. return;
  77. }
  78. }
  79. }
  80. }

Execute the project. Given below is the output.

File Operations In C#
File Operations In C#