Entity Framework The ALTER TABLE statement conflicted with the FOREIGN KEY constraint

Question

On updating database in Entity Framework , Code first Migration, I am getting this error:

The ALTER TABLE statement conflicted with the FOREIGN KEY constr

Answer 1

I got the solution of my Problem. Problem is "data" which i have in my clients table. Because my client table have medicalgroupid values which are not actually exist that's why it is giving me error on foreign key constraint.

Update Client set MedicalGroupId = NULL