check alphanumeric characters in string in c#

Question

I have used the following code but it is returning false though it should return true

string check,zipcode;
zipcode=\"10001 New York, NY\";
check=isalpha         


        

Answer 1

tring check,zipcode;
zipcode="10001 New York, NY";
check=isalphanumeric(zipcode)

    public static Boolean isAlphaNumeric(string strToCheck)
            {
                Regex rg = new Regex("[^a-zA-Z0-9]");

                //if has non AlpahNumeric char, return false, else return true.
                return rg.IsMatch(strToCheck) == true ? false : true;
            }

this code return always false, because the symbole ^ means that's this string doesn't contains any alphanumeric caractere, you need to delete the this ^