Adds an element to the end of the NameValueCollection.
            
Overload List
| Name | Description | |
|---|---|---|
| Add(NameValueEntry) | 
            Adds a NameValueEntry to the end of the NameValueCollection.
              | |
| Add(String, String) | 
            Adds an element with the specified String key and
            String value to the end of the NameValueCollection.
              |