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How to: Write Text to a File 

The following code examples show how to write text to a text file.

The first example shows how to add text to an existing file. The second example shows how to create a new text file and write a string to it. Similar functionality can be provided by the WriteAllText methods.

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.

Example

using System;
using System.IO;

class Test 
{
    public static void Main() 
    {
        // Create an instance of StreamWriter to write text to a file.
        // The using statement also closes the StreamWriter.
        using (StreamWriter sw = new StreamWriter("TestFile.txt")) 
        {
            // Add some text to the file.
            sw.Write("This is the ");
            sw.WriteLine("header for the file.");
            sw.WriteLine("-------------------");
            // Arbitrary objects can also be written to the file.
            sw.Write("The date is: ");
            sw.WriteLine(DateTime.Now);
        }
    }
}
using System;
using System.IO;
public class TextToFile 
{
    private const string FILE_NAME = "MyFile.txt";
    public static void Main(String[] args) 
    {
        if (File.Exists(FILE_NAME)) 
        {
            Console.WriteLine("{0} already exists.", FILE_NAME);
            return;
        }
        using (StreamWriter sw = File.CreateText(FILE_NAME))
        {
            sw.WriteLine ("This is my file.");
            sw.WriteLine ("I can write ints {0} or floats {1}, and so on.", 
                1, 4.2);
            sw.Close();
        }
    }
}

See Also

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