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How to: Write Text to a File

Updated: January 2010

The following code example shows how to write text to a text file.

It reads all the text flies, using a "*.txt" search pattern, from the user's documents folder and writes them into a large text file.

NoteNote:

Visual Basic users may choose to use the methods and properties provided by the My.Computer.FileSystem object for file I/O. For more information, see My.Computer.FileSystem Object.

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

class Program
{

    static void Main(string[] args)
    {

        string mydocpath = 
          Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
        string[] txtList = Directory.GetFiles(mydocpath, "*.txt");
        StringBuilder sb = new StringBuilder();

        foreach (string txtName in txtList)
        {
            using (StreamReader sr = new StreamReader(txtName))
            {
                sb.AppendLine(txtName.ToString());
                sb.AppendLine("= = = = = =");
                sb.Append(sr.ReadToEnd());
                sb.AppendLine();
                sb.AppendLine();
            }

        }

        using (StreamWriter outfile = 
        	new StreamWriter(mydocpath + @"\AllTxtFiles.txt"))
        {
            outfile.Write(sb.ToString());
        }
    }
}

Date

History

Reason

January 2010

Improved example.

Customer feedback.

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