in repeater control RPST date must next date of RAFF date

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C#3.5

In repeater control as follows

Coursename Coursedate AMt
RPST 29 Apr 2014 500
RAFF 29 Apr2014 600


I want to validate RAFF date must be next date of RPST date.


In repeater control i want output as follows


Coursename Coursedate AMT
RPST 29 Apr 2014 500
RAFF 30 Apr2014 600


how can i validate in asp.net.

with warm rgds,
Jeagan B.