how to push new values to arrays in c# code example

Example 1: c# push numbers to array

List<int> add_list= new List<int>();
for (int i = 0; i < 400; i++)
{
   add_list.Add(value);
}

Example 2: add item to an array c#

List<string> l = new List<string>(){"one","two","tree","four",};