RPST and RFPFF date must be continous

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ASP.NET

I want to validate date must be continuous

course name RPST

Batch date 23 sep 15

Submit

When i click submit the course name and batch date is saved in database.

Course name RFPFF

Batch date 29 sep 15

i want the RFPFF date must be the next date of RPST date.

in run mode RFPFF Batch date must be 24 sep 15 not any other date(29 sep 15)

for that how can i validate in asp.net using c#.