I apologise if I this is the second post of this kind.
But its first from me. I serached before posting & I did not get the desired answer.
I wasn't talking about you- when I posted my response it appeared twice for some strange reason. That's the double-post I was reffering to. You're question is a good one

Now I tried what u have suggested. But I want that data should be refreshed whenever user is changes the parameters. But its not happening.
You need to tell it to refresh- Try Form.Subform.Requery- replace Form with the form's name and subform with the subform's name. I think that should do it. This is from memory, so it might be a little off.

Also there is some data when I open the form for teh first time & no criteria ad been selected or entered
I'm afraid I don't understand what you mean by this. Can you explain a little more?