Exclude Non-Numeric Problem

Question

string s= oElement2.InnerText;
 string nonNumericValue = string.Concat(s.Where(a => !Char.IsDigit(a))); 
double dblPrice = Convert.ToDouble(s);

I am parsing a webpage and the result "1,500\r\nIn Stock" crashes my application. I am trying to exclude all the nonnumeric characters. Is this Lambda Expression incorrect ? thank you in Advance.