Format a string as currency

string.Format(System.Globalization.CultureInfo.GetCultureInfo("en-GB").NumberFormat,"{0:c}", 12.012);

string.Format("{0:£0,0.00}", 12.012)

 <globalization requestEncoding="utf-8" responseEncoding="utf-8" culture="en-GB" uiCulture="en-GB" />