Varaible where clause in linq

I have a generic List T, I need to query this list based on which field in this list is selected , so I need to have a variable where clause, how can I achieve this

List<T>, has GroupCode, Product, Country, Region

Currently I am doing

if (field =  GroupCode)
newfilteredList = (from p in filteredList.Where(r => r.GroupCode == FilterValue)

else if field =  product)
newfilteredList = (from p in filteredList.Where(r => r.product == FilterValue)


I want to do something like
newfilteredList = (from p in filteredList.Where(WhereClause)

Where the WhereClause would be some string witht he FilterField and value
LVL 1
countrymeisterAsked:
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Fernando SotoRetiredCommented:
Seeming that Linq is a strongly typed extension using strings in where clause in that way is not supported directly. You can use, "Dynamic LINQ (Part 1: Using the LINQ Dynamic Query Library)", too accomplish this. At this link you will find samples on how to use it and where to download the library.
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