atFirstOrDefault
atFirstOrDefault is a method in C# that is part of the LINQ (Language Integrated Query) library. It is used to retrieve the first element of a sequence that satisfies a condition, or a default value if no such element is found. This method is an extension method for IEnumerable<T> and IQueryable<T>.
The atFirstOrDefault method takes two arguments: an optional predicate, which is a function that returns true
The default value for reference types is null, and for value types, it is the type's default
This method can be particularly helpful when dealing with databases or other data sources where results might