[Solved] List.IndexOf(x) : Error => No overload for method ‘IndexOf’ takes 1 arguments in c# [closed]

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Do not confuse the static methods in the Array Class that must be used in conjunction with arrays and the instance methods of the List<T> Class.

    var array = new string[] { "a", "b", ";", "," };
    int i = Array.IndexOf(array, ";");


    var list = new List<string> { "a", "b", ";", "," };
    int j = list.IndexOf(";");

Since Array.IndexOf is a static method, you must pass it an array as the first parameter, where as List<T>.IndexOf is called on a List<T> instance (i.e., on an object of that type), and therefore such a parameter is not required.

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solved List.IndexOf(x) : Error => No overload for method ‘IndexOf’ takes 1 arguments in c# [closed]