How to search by multiple columns with OR operator in linq

Problem Statement : I have scenario where I have total 10 textbox. user can fill any textbox and search it. Here if user filled multiple textboxes and click on search then I need to put OR operator between selected fields(example text1value from tbl1 OR text2value from tbl2 )

Note: Every textBox has flag value if user filled it with data then flag will be 1. If flag is 1 then textbox value to check from table if exists in db.

Can anyone please help me how to achieve this using LINQ in C#

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