How to: Write to a Text File C#

 string[] lines = { "First line", "Second line", "Third line" };
        // WriteAllLines creates a file, writes a collection of strings to the file,
        // and then closes the file.  You do NOT need to call Flush() or Close().
        System.IO.File.WriteAllLines(@"C:\Users\Public\TestFolder\WriteLines.txt", lines);

 string text = "A class is the most powerful data type in C#. Like a structure, " +
                       "a class defines the data and behavior of the data type. ";
        // WriteAllText creates a file, writes the specified string to the file,
        // and then closes the file.    You do NOT need to call Flush() or Close().
        System.IO.File.WriteAllText(@"C:\Users\Public\TestFolder\WriteText.txt", text);

delete Temporary Internet Files in windows 7

C:\Users\%username%\AppData\Local\Microsoft\Windows\Temporary Internet Files