C# Regex to allow only alpha numeric

Question

I have the following regex ^[a-zA-Z0-9]+$ which would allow alpha numeric characters. The problem here is that if I enter only numeric character like \"897687\"

Answer 1

This function will return true or false based on whether the Regular Expression is matched or not,

   public static Boolean isAlphaNumeric(string strToCheck)
    {
        Regex rg = new Regex(@"^[a-zA-Z0-9\s,]*$");
        return rg.IsMatch(strToCheck);
    }