Hello, I need help with this C# assignment Im not sure how exactly to write the code.

You are to develop an application that reads student records from a sequential text file from a secondary storage device and process them. For each student there are 4 records stored in the student file: the first record contains the full first and last name of the student, the second record contains the exam 1 grade, the third record contains the exam 2 grade and the fourth record contains the exam 4 grade. Your app is to read the 4 records corresponding to each student, compute the average score of the three exams and display one line in a listbox containing the full name of the student, the average score and the corresponding letter grade to that score. Your app is to process an unspecified number of student records until the end of the input file is reached. The input file is to be specified by the user when the program invokes the openFile windows dialog and allows the user to either select an input file or type the name of it. You should use the studentsl.txt file as your testfile while you develop your app. students2 - Notepad File Edit Format View He boe Merrell 70 80 90 Chris Rich 95 8575 Kathryn Stevens 708080CarlyColombo 65 75 85 Mason Johnson 45 48 55 Oliver Twist 95 90 91 Thomas Sawyer 91 92 99 Ginger Weston 78 76 75 Micahel Stevens 88 86 82 Michelle Steveson 77 75 79 Stuart Johnson 65 6869 Jenny Flores 98 96 92 Jonas Benson 65 66 68 James Bannerson 30 45 students3 - Notepa File Edit Format John Dillinger 89 78 99 Al Capone 78 90 54 Jesse Jones 90 34 56 Charles Manson 90 90 92 Ted Kozunski 78 76 74 Tom Horn 65 63 60 Adam Lanza 45 56 42 Andrew Kehoe 84 83 80 students1 - Notepad File Edit Format View Help Joe Merrell 70 80 90 Chris Rich 95 85 75 Kathryn Stevens 70 80 80 Carly Colombo 65 75 85 Form1 x \begin{tabular}{|c|} \hline \begin{tabular}{|l|} \hline Process \\ Input File \end{tabular} Exit \\ \hline \end{tabular} You are to develop an application that reads student records from a sequential text file from a secondary storage device and process them. For each student there are 4 records stored in the student file: the first record contains the full first and last name of the student, the second record contains the exam 1 grade, the third record contains the exam 2 grade and the fourth record contains the exam 4 grade. Your app is to read the 4 records corresponding to each student, compute the average score of the three exams and display one line in a listbox containing the full name of the student, the average score and the corresponding letter grade to that score. Your app is to process an unspecified number of student records until the end of the input file is reached. The input file is to be specified by the user when the program invokes the openFile windows dialog and allows the user to either select an input file or type the name of it. You should use the studentsl.txt file as your testfile while you develop your app. students2 - Notepad File Edit Format View He boe Merrell 70 80 90 Chris Rich 95 8575 Kathryn Stevens 708080CarlyColombo 65 75 85 Mason Johnson 45 48 55 Oliver Twist 95 90 91 Thomas Sawyer 91 92 99 Ginger Weston 78 76 75 Micahel Stevens 88 86 82 Michelle Steveson 77 75 79 Stuart Johnson 65 6869 Jenny Flores 98 96 92 Jonas Benson 65 66 68 James Bannerson 30 45 students3 - Notepa File Edit Format John Dillinger 89 78 99 Al Capone 78 90 54 Jesse Jones 90 34 56 Charles Manson 90 90 92 Ted Kozunski 78 76 74 Tom Horn 65 63 60 Adam Lanza 45 56 42 Andrew Kehoe 84 83 80 students1 - Notepad File Edit Format View Help Joe Merrell 70 80 90 Chris Rich 95 85 75 Kathryn Stevens 70 80 80 Carly Colombo 65 75 85 Form1 x \begin{tabular}{|c|} \hline \begin{tabular}{|l|} \hline Process \\ Input File \end{tabular} Exit \\ \hline \end{tabular}