[c#] Clearing content of text file using C#

How can I clear the content of a text file using C# ?

You can use always stream writer.It will erase old data and append new one each time.

using (StreamWriter sw = new StreamWriter(filePath))
{                            
    getNumberOfControls(frm1,sw);
}

Just open the file with the FileMode.Truncate flag, then close it:

using (var fs = new FileStream(@"C:\path\to\file", FileMode.Truncate))
{
}

Simply write to file string.Empty, when append is set to false in StreamWriter. I think this one is easiest to understand for beginner.

private void ClearFile()
{
    if (!File.Exists("TextFile.txt"))
        File.Create("TextFile.txt");

    TextWriter tw = new StreamWriter("TextFile.txt", false);
    tw.Write(string.Empty);
    tw.Close();
}

Another short version:

System.IO.File.WriteAllBytes(path, new byte[0]);

 using (FileStream fs = File.Create(path))
 {

 }

Will create or overwrite a file.