Multiple sequences can be combined into a single sequence using the LINQ Concat operator. Concat takes two sequences as input and outputs a new sequence that sequentially adds each element from both input sequences.   Here is an illustration of how to combine two lists of Student objects into one list using the Concat operator:  List students1 = ...
List students2 = ...
var allStudents = students1.Concat(students2);  In this example, the students1 and students2 lists are combined into a single list called allStudents using the Concat operator. The Concat operator creates a new list from both input lists that have the items in the original lists' order, one after the other.   To link more than two lists, you can chain together several Concat operations.  List students1 = ...
List students2 = ...
List students3 = ...
var allStudents = students1.Concat(students2).Concat(students3);  You are combining the lists of students1, students2, and students3 into a single list here called allStudents.   In conclusion, by accepting two sequences as input and returning a new sequence that combines the elements of both input sequences, one after the other, the Concat operator of LINQ may be used to combine multiple sequences into a single sequence. It can be used to chain together several Concat operations to connect more than two lists into a single one, as well as to combine multiple lists, arrays, etc. of the same type.