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Calculating Sequential Access Files in Visual Basic.Net

In my application I've created a sequential access file or often call a text file in Visual Basic.Net. I am wondering how can I code the program to calculate the average of all the data from the sequential access file?

Example: Let say my money program ask me to enter the amount (one at a time) of all the things I bought today and the amount I enter would store in the sequential file. The money program has a average button that will calculate the average of all amount I spent. How can code the average button to read all the amount I enter in the sequential file and give me the average? Program examples would be helpful.

Thank you.

Solution Preview

Create an integer variable sum in the subroutine. Now read teh first entry of the file and add it to sum, such as:
sum = sum + (entry from the ...