C# Module Build

De-dupe API Need a class library to be built using C# (4.0) and Dynamic Linq to achieve the following functionality. Please do not use any DataTable, DataView to achieve this, only use Dynamic Linq. Functionality: Take a DataTable and as per columns specified and output criteria, data should be filtered and returned in a new DataTable. Input : 1. DataTable ([login to view URL]) 2. Column criteria (single column or multiple column or all columns) List<string> 3. Output Criteria (Unique rows/ Duplicate rows) enum Output: DataTable ([login to view URL]) Example: if column criteria is one column, find all unique rows for all that column and all duplicate rows for that column and so on for multiple columns Required: 1. Clean code 2. Comments 3. Use of abstract or interfaces where necessary 4. Should be able to handle 1 million rows (not worried about time, but no memory leaks please) 5. Please try to keep it simple 6. No need to get into threading in class library as it adds overload