Format a double value like currency but without the currency sign (C#)

Question

I feed a textbox a string value showing me a balance that need to be formatted like this:

###,###,###,##0.00

I could use the value.ToString

Answer 1

string result=string.Format("{0:N2}", value); //For result like ### ### ##.##

Answer 2

CultureInfo cultureInfo = new CultureInfo("en-US");
cultureInfo.NumberFormat.CurrencySymbol = "Rs.";

Thread.CurrentThread.CurrentCulture = cultureInfo;
decimal devimalValue = 3.45M;
this.Text = devimalValue.ToString("C2"); //Rs.3.45

Answer 3

string forDisplay = currentBalance.ToString("N2");