c# one array contains all elements another array code example

Example 1: c# arraylist contains

IList arList = new ArrayList();
arList.Add(100);
arList.Add("Hello World");
arList.Add(300);

Console.WriteLine(arList.Contains(100)); // true

Example 2: c# check if array contains value

public static bool Contains(Array a, object val)
    {
        return Array.IndexOf(a, val) != -1;
    }