using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        string dec1 = "100,00";

        string dec2 = "100.00";

        string dec3 = "1000,00";

        string dec4 = "1.000,00";

        string dec5 = "1,000.00";

        string dec6 = "1.000,50";

        string dec7 = "1,000.50";

​

        decimal output = 0;

​

        CultureInfo provider = new CultureInfo("tr-TR");

        decimal.TryParse(dec1, NumberStyles.Currency, provider, out output);

        Console.WriteLine(dec1 + " -> " + output);

        decimal.TryParse(dec2, NumberStyles.Currency, provider, out output);

        Console.WriteLine(dec2  + " -> " + output);

        decimal.TryParse(dec3, NumberStyles.Currency, provider, out output);

        Console.WriteLine(dec3  + " -> " + output);

        decimal.TryParse(dec4, NumberStyles.Currency, provider, out output);

        Console.WriteLine(dec4  + " -> " + output);

        decimal.TryParse(dec5, NumberStyles.Currency, provider, out output);

        Console.WriteLine(dec5 + " -> " + output);

        decimal.TryParse(dec6, NumberStyles.Currency, provider, out output);

        Console.WriteLine(dec6  + " -> " + output);

        decimal.TryParse(dec7, NumberStyles.Currency, provider, out output);

        Console.WriteLine(dec7  + " -> " + output);

    }

}