How to append data to file and clear it when it's closed

[y khan]

I have values changing at some rate per second that i am storing in a variable then i am printing these values in a file. So i have to append the values into the file so that they are not over written and all the values are displayed line by line. But when i close the program i need the file to be cleared. But only when i close the program and not when the function exits that it clears the file.

[samueal]

To append the data to a file use:

File.AppendAllText("myfile.txt","I am a C# developer");

use \r\n to write in the new Line.

To clear the file while closing write the Code in the form's Dispose method