using System.Globalization;
 
public class Program {
	public static void Main() {
		var minhaCultura = new CultureInfo("pt-BR"); 
		minhaCultura.DateTimeFormat.ShortDatePattern = "dd/MM/yyyy";
		minhaCultura.DateTimeFormat.ShortTimePattern = "HH:mm";
		minhaCultura.NumberFormat.NumberDecimalDigits = 2;
		minhaCultura.NumberFormat.NumberGroupSeparator = "_";
		minhaCultura.NumberFormat.NumberDecimalSeparator = ",";
		System.Console.WriteLine(string.Format(minhaCultura, "{0:N}", 43239.11));
	}
}
 
//https://pt.stackoverflow.com/q/44957/101

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