User Control And Properties

Question

Hi,

   

   In my Application, I am creating a User Control which contain  GridView and Button. In User Control I have defined two Properties, one for UCDSource as DataTable and another SFlag  as Boolean flag. 

   On Button's Click Event I set SFlag to true and make Visible Property of few Columns to false. Now again when I click to the same button's Click Event I won't get the Boolean Property as true its display as false.

   I find all set value lost on the Post back on the Parent Page.

I want all those Property values on the events of Buttons contains in the User Control.

I think I missing something basic about Event handling in the User Control.

Any Help appreciated........

Thanks,

  VIKram