cancelling an oracle command while executing

Question

Hi,

I am developing one windows based application using c#.
I have one datagird and one search button. By clicking on the search button it wil connect to the database and get data and bind it to the datagrid.
My requirement is after clicking on the search button one dialogbox like thing should be shown which wil contain a lable and a cancel button. If we click on the cancel button it should stop executing the query and it should not fetch the data. so, the datagrid will be empty.

Is there any way to do this functionality. It is very urgent for me.
If somebody knows please help me.

Thanks and regards
Pallavi.B