asp.net gridview with checkbox

I have a grid view with checkbox in respected column for date of a month along with each row.   and two drop down list for month and year but these ddl are outside the gridview to retreive value in grid view with respective month and year.

I want to insert the value on the basis of ddlmonth ,ddlYear and selected checkbox from the date of respective employee.

I want to retrieve value from the database on the basis of ddl month and ddlyear  how much date a employee have work in that month. 

 

EmployeeName	1	2	3	4	5	6	7		8	9	10
ABC	ch1	ch2	ch3	ch4	ch5		ch6
PQR	ch1	ch2	ch3	ch4	ch5		ch6

 

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