In ADO.NET, ExecuteNonQuery() "For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command" (http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.executenonquery.aspx)
In EF v1, context.SaveChanges() method returns "The number of objects in an Added, Modified, or Deleted state when SaveChanges was called." (http://msdn.microsoft.com/en-us/library/bb739065.aspx)
Please tell, when multiple entities (or single entity) are added or updated to context and context.SaveChanges() method is called, how to check if actual INSERT or UPDATE was successful.
Can we assume if there was NO exception that INSERT(s) or UPDATE(s) was successful ?
Yes, if there is no exception you may assume that the statements executed successfully.
Maybe this is not direct answer to the question, but may help. By default all commands are encapsulated in one DbTransaction when SaveChanges method is called (Julia Lerman, Programming Entity Framework). So, or all commands will be successfully executed, or neither. That's one way to know if insert, or update or delete was successful.