How do you concatenate Lists in C#?

Question

If I have:

List myList1;
List myList2;

myList1 = getMeAList();
// Checked myList1, it contains 4 strings

myList2 = getMeAnother         


        

Answer 1

Take a look at my implementation. It's safe from null lists.

 IList all= new List();

 if (letterForm.SecretaryPhone!=null)// first list may be null
     all=all.Concat(letterForm.SecretaryPhone).ToList();

 if (letterForm.EmployeePhone != null)// second list may be null
     all= all.Concat(letterForm.EmployeePhone).ToList(); 

 if (letterForm.DepartmentManagerName != null) // this is not list (its just string variable) so wrap it inside list then concat it 
     all = all.Concat(new []{letterForm.DepartmentManagerPhone}).ToList();