how selected all month through save one parameter in c# desktop

Question

how checkbox selected all months  save table one parameter in c# window

 

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ID	Fee Name	Payment Amount	Months
1	Exam	500	January
2	Exam	500	February
3	Exam	500	March
4	Exam	500	April
5	Exam	500	May
6	Exam	500	June
7	Exam	500	July
8	Exam	500	August
9	Exam	500	September
10	Exam	500	October
11	Exam	500	November
12	Exam	500	December