how to find the next batch date available using sql server query

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C#

in database records as follows

Minor_Code     Startdate

 PSCRB        11/05/2013
 R-AFF        12/05/2013
 PSCRB        14/05/2013
 R-AFF        15/05/2013
 PSCRB        17/05/2013
 R-AFF        18/05/2013
 PSCRB        20/05/2013
 R-AFF        21/05/2013
 PSCRB        27/05/2013
 R-AFF        28/05/2013

In design as follows

PSCRB   Dropdownlist(From database Startdate are retrieved)
R-AFF   Dropdownlist(From database Startdate are retrieved)

          11/05/2013
          14/05/2013
PSCRB     17/05/2013
          20/05/2013
          27/05/2013

          12/05/2013
          15/05/2013
R-AFF     18/05/2013
          21/05/2013
          28/05/2013

Correct way user has to select is RPSCRB date 11/05/2013(from the dropdownlist) and R-AFF date 12/05/2013(from the dropdownlist)

suppose if user select RPSCRB date 11/05/2013(from the dropdownlist) and R-AFF date 15/05/2013(from the dropdownlist) that time check from the database using sql server query,check the next available batch date.

for that how can i check next available batch date using sql server from the database.

rgds,
narasiman P.