namespace System.Web.ModelBinding {
    using System;
 
    internal static class ValueProviderUtil {
 
        public static string CreateSubPropertyName(string prefix, string propertyName) {
            if (String.IsNullOrEmpty(prefix)) {
                return propertyName;
            }
            else if (String.IsNullOrEmpty(propertyName)) {
                return prefix;
            }
            else {
                return prefix + "." + propertyName;
            }
        }
 
    }
}