using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        string dateTimeInputParameter = "2022-01-18T00:00:00.000";

        string dateFormatOptionParameter = "M";

        string cultureParameter = "fr-fr";

        string numericalValue = "2345.67";

        string numericalFormatOptionParameter = "F";

        Console.WriteLine(

            GlobalizeDateString(dateTimeInputParameter, dateFormatOptionParameter, cultureParameter)

            );

        Console.WriteLine(

            GlobalizeNumericalString(numericalValue, numericalFormatOptionParameter, cultureParameter)

            );

    }

    public static string GlobalizeNumericalString(string input, string formatOption, string cultureName){

        CultureInfo culture = CultureInfo.GetCultureInfo(cultureName);

        if(culture == null) return "error";

        decimal d;

        if(!decimal.TryParse(input, out d)) return "error";

        return d.ToString(formatOption, culture);

    }

    public static string GlobalizeDateString(string input, string formatOption, string cultureName){

        CultureInfo culture = CultureInfo.GetCultureInfo(cultureName);

        if(culture == null) return "error";

        DateTime date;

        if(!DateTime.TryParse(input, out date)) return "error";

        return date.ToString(formatOption, culture);

    }

}

​