Cause: the res:// path changed. Need to be modified
Change connection for edmx file from metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;
To metadata=res://projectname/foldername.csdl|res://*/Model1.ssdl|res://*/Model1.msl;
The red color part is intructing to call another contructor.
class ListNode { private object data; private ListNode next;
public ListNode(object dataValue) : this(dataValue, null) { }
public ListNode(object dataValue, ListNode nextNode) { data = dataValue; next = nextNode; } }