Question

i have a 4 list in c# how i can make a list from them. means to say make a list from the result of 4 list.

Answer 1

You can also use the List constructor to achieve this.

Something like

List<string> list1 = new List<string>();
List<string> list2 = new List<string>();
List<string> list3 = new List<string>();

...

List<string> concat = new List<string> (list1.Concat(list2).Concat(list3));