C# sometimes currency format does not work

Question

It seems that sometimes the currency format does not work:

string Amount = "11123.45";
Literal2.Text = string.Format("{0:c}", Amount);

reads 11123.45

it should be:

$11,123.45

Answer 1

That code would never work - because Amount is a string, not a number. The currency format only applies to numbers.

For example:

decimal amount = 11123.45m;
Console.WriteLine(string.Format("{0:c}", amount);

(Note that using double for currencies is almost always a bad idea, as double can't exactly represent many decimal numbers. Decimal is a more appropriate type for financial data.)

Answer 2

It's because Amount is a string instead of a numeric.