Grade Management System VB 2010

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Design a simple grade management system (GMS). Each course is defined by a file. The GMS will permit the instructor to create course files, to update the files with final marks, and to calculate the final letter grades based on the statistical distribution of the final marks in the course. The GMS will employ two forms, as follows:
The initial form (main menu) will be used to determine which activity the user is to perform and will require the user to specify a class.
? The main menu should provide the following activities:
? Create a new course file. The filename will be the course name and number. A textbox will be used to enter the name of the new course. The names of all course files will be maintained in a file called “courses.txt”.
? Edit an existing course file. A ListBox will display the available course files. The highlighted course name in the list box will be the file selected for editing.
? Calculate letter grades for all students in a course. See below.
? Once a file has been identified, entries to that course file will be performed using a second form, the “data entry” form.
The “data entry” form will be used to add entries to a course file, to edit existing entries, and to delete entries. Each line of the file contains a student number, a final mark (out of 100), and a letter grade (initially “N”). Each value is separated from the next by a comma. The course file should be displayed in a ListBox. By selecting a line of the ListBox, the corresponding line can be edited as follows:
? Three TextBoxes display the student number, score, and present letter grade.
? Four Buttons provide the functions:
? “Add” adds a new line to the ListBox (and file) constructed from the values provided in the three TextBoxes.
? “Delete” removes the highlighted line from the ListBox (and file).
? “Change” constructs a new line from the existing one by replacing any values that have corresponding new entries in the TextBoxes. If a TextBox is empty, then the corresponding value is not replaced.
? “Exit” updates the file with the changes, closes the file, and closes the “Data entry” window.
When the “calculate letter grade” activity is selected, letter grades will be assigned to all students by calculating the mean and standard deviation. The variables “m” and “s” denote the mean and standard deviation of the students’ scores and can be computed using their formulae. The “Edit” activity can subsequently be used to view the grades.

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