Master page problems in IIS...................

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.NET

hi
i have a master page on that a master page i have one calender control
on selecting that date on calender1_SelectionChanged , and calender1_VisibleMonthChanged are getting fired and session["date"] is getting filled and again i am calling the parentpage.aspx
so that session can be retrieved and according to that grid view get binds again
the gridview refreshes and shows all the data this is working fine on development server

but when on running IIS 7.5
on changing the dates of the calender which is present on the master page
its working fine but
the gridview is not binding even the label is not getting refresh
it should show the date which is present in session