ExtensionMethods.cs

public static class Extensions
{
    public static bool IsNumeric(this String value)
    {
        return Regex.IsMatch(value, @"^\d+$");
    }

    public static string Numeric(this string value)
    {
        return Regex.Replace(value, "\\D", String.Empty);
    }

    public static IEnumerable<Control> All(this ControlCollection controls)
    {
        foreach (Control control in controls) {
            foreach (Control grandchild in control.Controls) {
                yield return grandchild;
            }
            yield return control;
        }
    }

    public static bool TryParse<T>(this Enum e, string value, out T result)
    {
        return TryParse<T>(e, value, out result, false);
    }

    public static bool TryParse<T>(this Enum e, string value, out T result, bool ignoreCase)
    {            
        try {
            result = (T) Enum.Parse(typeof(T), value, ignoreCase);
            return true;
        }
        catch {
            result = default(T);
        }
        return false;
    }
}