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Entity Framework Update table without primary Key (II)

The property ‘xxx’ is part of the object’s key information and cannot be modified

UserRight dboUserRight = DBModel.UserRights.FirstOrDefault(x => x.UserID == id 
                                                             && x.PageID == pid); 
dboUserRight.CanWrite = newValue; 

Method 1: Replace old record

UserRight updatedUserRight = new UserRight();
updatedUserRight.CanWrite = newValue;
updatedUserRight.OtherProperty = xxxx;

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