using System;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        var sourceValue = "0,123"; //Input value

        decimal result = decimal.Parse(sourceValue, CultureInfo.GetCultureInfo("de-de"));  //Convert Decimal value with German(de-de) culture

        Console.WriteLine(result.ToString(CultureInfo.InvariantCulture));  //Now print converted decimal to string using "InvariantCulture" culture

    }

}