Paul Abbott questions

Paul Abbott answers

• Primary Key based on Foreign Keys EF
• Visual Studio running the wrong code
• Entity Framework 6 - Select Parents Where Children Equal
• Entity Framework 6 - Select Parents Where Children Equal
• Append to a Text File (Not Overwrite!)
• ORM and Database Constraints
• Filter XDocument more efficiently
• Prevent a TFS task (work item) from being "Resolved"
• SQL average multiple columns for each row with nulls
• Windows Phone 8.1 WinRT memory leak with ObservableCollection