add price of selected items from checklistbox in c# windows

Question

Plz help me!

 

I am developing a VS 2010 C# windows form application such that I have a checkedlistbox with subject name when i choose course from combobox then checkboxlist shows all subject related to course name. also I have simple checkbox for (select all subject), i want to check all subject or check particular subject . Now when i checked subject then  fee will be added and show on textbox . fee is given into the database of subject table

 

For example:

                        Subject Name=  Fee 

Checkedlistbox item 1 English=  1000

Checkedlistbox item 2 Hindi    =   500

Checkedlistbox item 3 Marathi = 800

Checkedlistbox item 4 Science= 2000

Checkedlistbox item .......n

 

On a subject selected event, If for instance I checked items 1,2 and 4, I want the sum of these values (i.e 3500)

displayed in textbox1.

Many thanks.