Correctly print a double value using Tostring()

Question

I’m having difficulty printing a monetary value correctly with the distribution of its decimal places, I used the ToString() using parameters such as "C", "F" and "N", what needs to be done to leave a correct monetary value?

using static System.Console;
using System.Globalization;

namespace AtividadeRepeticao
{
    class Program2
    {
        static int Main(string[] args)
        {
            double valor = 1000.50;
            Write($"Valor: {valor.ToString("C", CultureInfo.CurrentCulture)}");
            ReadKey();
            return 0;
        }
    }
}    

// Valor esperado
1.000,50
// Valor imprimido
100.050,00

Answer 1

If you want a monetary value you use a decimal and not a double. If you want in the current culture you have no reason to specify this.

using static System.Console;

namespace AtividadeRepeticao {
    class Program2 {
        static void Main() {
            decimal valor = 1000.50M;
            Write($"R$: {valor}");
        }
    }
}

Behold working in the ideone. And in the .NET Fiddle. Also put on the Github for future reference.

I think this code produces a more suitable result, but if you want to insist on your way and the problem is quotation marks inside quotation marks then use parentheses:

using static System.Console;

namespace AtividadeRepeticao {
    class Program2 {
        static void Main() {
            decimal valor = 1000.50M;
            Write($"R$: {valor.ToString(("C"))}");
        }
    }
}

Behold working in the ideone. And in the .NET Fiddle. Also put on the Github for future reference.