I am generating employee timesheet using asp.net with c#

Hi,

 

I have an application where we can generate timesheet for the employee, where employee can generate for complete month, now the requirement is employee can generate for fortnight (15 days)  and then employee can generate for remaining days later.

 

Here I am facing the issue is while generating the timesheet I am taking  complete days count for that month and I am generating the timesheet for 15 days now and later I will generate for remaining 15 days, now iam unable to generate for those remaining 15 days it is showing that timesheet already generatedfor that particular dates selected.

 

Any help can be appricated