Lambda expressions

When you start coding in c#, EF you need to get familiar to Lambda. By time you start to use it all queryable objects.

Here is the article at Microsoft docs.

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/statements-expressions-operators/lambda-expressions

And here is an other article in codeproject:

https://www.codeproject.com/Articles/33769/Basics-of-LINQ-Lamda-Expressions