c# Extentions In

In.cs

public static class Extentions
{
    public static bool In<T>(this T value, params T[] args) where T : IComparable
    {
        foreach (T arg in args)
            if (arg.Equals(value))
                return true;
        return false;
    }
    
    public static bool In<T>(this T value, IEnumerable<T> args) where T : IComparable
    {
        foreach (T arg in args)
            if (arg.Equals(value))
                return true;
        return false;
    }
}