Did you use the dataset builder in .net to build you dataset ? The tables(schema) in dataset must match exactly with the tables(schema) in your database. Make sure that first. Then create an instance of that dataset class in you project.
When you program starts, connect to the databse.
After connecting, you can use a data adapter to fill the dataset.
Dont forget to set the dataset as datasource for the report.
You'll find the things mentioned above in many other places, but these are common sources of error. So make sure you've done these things right.
One more thing. If you find it difficult to make the dataset exactly like the schema in your database, you can try untyped dataset.
Edited by raiyan - 18 Apr 2007 at 6:49am