I am having a problem with my program

I am using DataReport to create a report based on a table in my database
My program open the database and while it is opened some changes to the table is done and the datareport is showed while the database is opened

I need to change the Connection String in order to refresh the link to the opened database
but every time I call the procedure that change the connection string (In the Enviroment Designer) a dialog appears to specify the connection string
and the report show a message that it couldn't retrieve any fields
So how can I solve this
I mean to change the connection string after the changes of the table happens and then refresh my data in the report

Thank you very much