. Net Framework Data Provider Error

This exception occurs when the Dispose () method of the SqlConnection object is invoked in the destructor, but not elsewhere. Search for MSDN resources to find answers:
Http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=473449&SiteID=1
The following is an explanation of the Sqldatareader.close () method:
Http://msdn2.microsoft.com/en-us/library/system.da ta.sqlclient.sqldatareader.close.aspx
Note this text:
Do don't call Close or Dispose on a Connection, a DataReader, or no other managed object into the Finalize method of your CLA Ss. In a finalizer, your should on -ly release unmanaged The Your class owns directly. If your class does not own the any unmanaged resources, does not include a Finalize method in your class definition.
Do not call connection, DataReader, or the close () or Dispose () methods of other managed objects in destructors, the destructor should simply place the unmanaged members of the class, and do not create destructors if the class does not contain unmanaged members.

This type of problem usually occurs when a thread-safe object is accessed across threads, and even if you do not show one, there will be separate threads within the CLR.