Why is the StreamWriter not writing?

I am trying to write a bit of text to a file called reciept.txt. I have included the "System.IO" namespace. When I click the save button it should just write that simple bit of text in the file. When I open the file however, it's just blank. The file already exists.

private void btnSave_Click(object sender, EventArgs e)
      {
          string deskPath = System.Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
          bool fileExists = File.Exists(DesktopBounds + "/reciept.txt");

          using (StreamWriter sw = new StreamWriter(deskPath+"reciept.txt"))
          {
              sw.WriteLine("asdasdasd");

          }
      }

Any suggestions why it's not writing even when things look right?

Tags: C#