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Troubleshooting Question

Compare between two lists data and select Different in third list in entity framework

Temody Mas
Temody Mas asked
Last Modified: 2020-09-19
I have an updated list and save this list before last changes in another list now I need query to compare between this two list and found difference, put it in third list

what I try
var ThirdList = newdata.Except(original_data);
but has exception That the first list doesn't Contain definition for Except

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