Entity Framework 6 - Knowledge Base (KB)

Is Null, Is Not Null in Entity Framework Linq

I have a method that receives a category id, followed by two optional string parameters that default to null....I tried using a few similar answers from other questions on SO but sofar none have helped....I am trying to get the linq to EF query to work as...

Optional Parameters in EntityFrameWork query

My method signatures are as following. Only Id is mandatory, all other three parameters are option. I need to handle this in where clause. If optional ones are present then i need to add them to where clause otherwise query should be built on Id and whate...