How to: Write Text to a File

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.NET Framework Developer's Guide

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.

Note:
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.

Example

Visual Basic

Imports System
Imports System.IO
Imports System.Text

Class Program

    Public Shared Sub Main(ByVal args As String())

        Dim mydocpath As String = _
        	Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
        Dim txtList As String() = Directory.GetFiles(mydocpath, "*.txt")
        Dim sb As New StringBuilder()

        For Each txtName As String In txtList
            Using sr As New StreamReader(txtName)
                sb.AppendLine(txtName.ToString())
                sb.AppendLine("= = = = = =")
                sb.Append(sr.ReadToEnd())
                sb.AppendLine()
                sb.AppendLine()

            End Using
        Next

        Using outfile As New StreamWriter(mydocpath & "\AllTxtFiles.txt")
            outfile.Write(sb.ToString())
        End Using
    End Sub
End Class

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());
        }
    }
}

Change History

Date	History	Reason
January 2010	Improved example.	Customer feedback.

How to: Write Text to a File

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