a problem with ext.net1.0 examples

[hefeilixin]

hi ,
i am interested in Ext.net, so i look up the example of https://examples1.ext.net/#/Combinat.../Simple_Tasks/.

it's a good job, but when i read through it carefully i got a problem with that it's code is missing partially.

So ,I can understand what's this mean "category.Categories" and "category.Tasks" etc.

i don't know what the "SimpleTasksDataContext" Class like and its context, and in my opinion the Categories is a Tables and its class reflection is the categorie,how can the category use Categories as its property?

it's the same with category.Tasks. Can you help me providing a copy of this Class file or explain the relationship of this Tables?

Thank you a lot!

[hefeilixin]

i've seen some content about sql.linq ,and i know this "category.Tasks" mean getting data directly from Tasks(Table) through Category

but how this category.Categories work out?

Is this entity internal relationship?

How can I create a table like it ?