formatting - Force ASP.NET textbox to display currency with $ sign

Question

Is there a way to get an ASP.NET textbox to accept only currency values, and when the control is validated, insert a $ sign beforehand?

Examples:

10.23 becomes $10.23
$1.45 stays $1.45
10.a raises error due to not being a valid number

I have a RegularExpressionValidator that is verifying the number is valid, but I don't know how to force the $ sign into the text. I suspect JavaScript might work, but was wondering if there was another way to do this.

Answer 1

The ASP.NET MaskedEdit control from the AJAX Control Toolkit can accomplish what you're asking for.