validate the from date and excel 2nd row date mustbesame

Question

In run mode as follows

 

From date Calendar1 To date Calendar2 Import (Button)

In excel records as follows

Date Course Session Faculty

18-Aug-14 RMFA 1 DOC

18-Aug-14 MC 2 DRS

19-Aug-14 SSO 3 BSR

19-Aug-14 EFA 4 MJ

19-Aug-14 SSO 5 BSR

19-Aug-14 EFA 6 MJ

I have one Gridview as follows

When user click the Import Button, The above excel records will be displayed in Gridview.

 

In Gridview Record as follows

Date Course Session Faculty

18-Aug-14 RMFA 1 DOC

18-Aug-14 MC 2 DRS

19-Aug-14 SSO 3 BSR

19-Aug-14 EFA 4 MJ

19-Aug-14 SSO 5 BSR

19-Aug-14 EFA 6 MJ

I want to validate user has to select the From date 18-Aug-14 from the calendar1 and in excel

2nd row must be 18-Aug-14 date .

For your understanding i am writing as follows

Fromdate selected date and in excel 2nd row date must be the same.

For that how can i validate in asp.ent using C#.