error message in ado.net

hi all i am trying to learn ado.net .......i am trying to make a program that connect to a database with access xp when i try to connect the program with OLEDB data adapter (in this step) after trying to make the querey it give me this error (knowing that my database has no password from access): the connection couldnot be opened because of the following error: format of the initialization string doesnot conform to the ole db specification and after that it ask me to the user name and password of the database!!! so what is the problem and how can i solve it thanks for the help