Asp.net C# - Custom configuration attribute

Question

I have a config file as follows :

 <section>
    <template Count="20">
     <data>
     some data here
     </data>
     <data>
     some more data here
     </data>
    </template>

    <template Count="25">
     <data>
     some data here
     </data>
     <data>
     some more data here
     </data>
    </template>        
</section>

I have a template class inherited from ConfigurationElementCollection :

public sealed class template<T> : ConfigurationElementCollection, IEnumerable<T>
       where T : ConfigurationElement, new()
{
...
}

I need a way to access the attribute "count", How should I define the count ConfigurationProperty and do I have to over ride the OnDeserializeUnrecognizedElement ?