Have you added that ACCDB file to your project? If not, you should do so. That will prompt you to copy the file into the project, which you should accept. I think that it will also generate a Data Source. If it doesn't do that automatically, you should open the Data Sources window and create one yourself. That will give you a typed DataSet that you can use to store the data in your app and table adapters that you can use to retrieve data and save changes.