Convert.ToDateTime does not work in Where clause

[Oboro]

Am trying to run the following linq query:

var budgetAllocated = from a in _scope.Extent<BudgetDetail>()
                              where (Convert.ToDateTime(a.DateAllocated).Month == DateTime.Toady.Month)
                              select a;

But I keep getting the following error:

Execution of 'System.Convert:ToDateTime(Object)' on the database server side currently not implemented.

Please, can any one help? I have been at this all day.

[Oboro]

Found a solution, check "Compare DateTime Objects" thread.