InvalidOperationException: Sequence contains more than one element

Question

I have the following code below for a payroll program. The first dictionary holds the employee IDs and corresponding basic pays held in a master data table. The second dict

Answer 1

You can use FirstOrDefault() but SingleOrDefault throws an exception if more than one element exists.

Here you can see exactly what the single or default method does: http://msdn.microsoft.com/en-us/library/system.linq.enumerable.singleordefault(v=vs.100).aspx