Compare tables based on date range and one column using LINQ?

There are two Data Tables.
The first table is as follows: CustDT

and the second table is : MasterDT

Output DT

Process: CustDT column “productsegment” = MaterDT Column "productsegment "
then check from CustDT Startdate and enddate is lies between masterDT Start Date and FinishDate. If yes then write value in Select “spendvalue”.
and from CustDT Startdate and enddate is not lies between masterDT Start Date and FinishDate then Copy date from CustDT and Write dates in select.


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