Process p = Process.Start('notepad.exe', fName) Private void button1_Click(object sender, EventArgs e)Ĭonst string fName = buffer = Guid.NewGuid().ToString() //junk data I'm using another method here in case you want to log writes etc. Public static void AppendText(string FileName, string Buffer) This code will append the text, create the file if needed, and display the output after each write. File.AppendAllText() creates a file if it does not exist and appends the text (not a line). System.IO.File.WriteAllText(filePath, text) StreamWriter sw = File.AppendText(filePath) įileStream aFile = new FileStream(filePath, FileMode.Append, FileAccess.Write) StreamWriter sw = new StreamWriter(aFile) NOTE: commented code are all of the different attempts that failed: public static void FileWriter(string filePath, string text, bool fileExists)įileStream aFile = new FileStream(filePath, FileMode.Create, FileAccess.Write) I am also passing the filepath, and the text to be appended. I am passing a boolean to force the creation of a new file the first time it runs. I can append a line, but I don't need to append a line. I can create the file, and write text to it, but when I have to append text, for some reason, it fails. I need to add text (not a line) to an existing text file, using C#.

Write to text file using streamwriter c