How to bind drop down list?

Question

Hi friends,

     I have a doubt how to bind drop down list. i have a table.

 

Id	Category Name	Main Category	Weight
1	Curriculum	0	0
2	Science	1	1
3	Non-Curriculum	0	0
4	Physics	2	2
5	Acting	3	1
6	Concave Lense	4	3

 In this table the main category is denotes the subcategory which will come under that category the weight denotes that sub category level.

 

for the above table i want to bind drop down like this format 

Curriculum

-Science

--Physics

---Concave Lense

Non-Curriculum

-Acting

Can any one know the solutions please help me. u often see this is in article posting sites. if any one have the idea tell me,
 
Thanks,