Best Extension Methods: Is Matching with one of any String

Using below extension method we can check that a value is matching with one of any parameter or not...

    //  below function is replacement for such condition   if(reallyLongStringVariableName == "string1" || 
    //    reallyLongStringVariableName == "string2" || 
    //    reallyLongStringVariableName == "string3")
    //{
    //  // do something....
    //}
    public static bool In(this T source, params T[] list)
    {
        if (null == source) throw new ArgumentNullException("source");
        return list.Contains(source);
    }

Compiled By: Rajesh Rolen