How to implement treeviews/lists in asp.net and c#?

Question

Hi ,

I have two tables in Sql Server Database:
Table1: Category - Columns Category_ID, categoryName
Table2: SubCategory --Columns SubCategory_ID, SubCategoryName, Category_ID

How to create treeviews for each category?
Category Table Data:
1   Item1
2   Item2
3   Item3
4   Item4

SubCategory Table Data
1  SubItem1   Item1
2  SubItem2   Item1
3  SubItem3   Item1
4  SubItem4   Item2
5  SubItem5   Item2
6  SubItem6   Item3
7  Subitem7   Item3

 How to display the below treeviews/Lists on UI

Item1                       Item2                   Item3                    Item4       
  SubItem1                   SubItem4              SubItem6
  SubItem2                   SubItem5              SubItem7
  SubItem3

Please provide me the asp.net and c# code that will generate the above UI. I am new to c#..

Thanks