Question about "[" - "]" mark

Hi all,

When I am reading this article :

http://asp.net/learn/dataaccess/tutorial02cs.aspx?tabid=63

I found most of its class methods are under some "[" and "]" mark. For example :

[CODE]
// What the meaning of this one line below?
[System.ComponentModel.DataObject] 
public class ProductsBLL
{


// And also one line below? 
    [System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Select, true)]
    public Northwind.ProductsDataTable GetProducts()
    {
        return Adapter.GetProducts();
    }
[/CODE]

I don't understand what is this "[System.ComponentModel.DataObject]" used for? (and also the ones at the top of getProducts() method)

Is there any tutorial for this "[aCharacter]" ?

Hi,
it's an attribute, more specifically a DataObjectAttribute. 
According to the documentation on MSDN: Use the DataObjectAttribute attribute to identify an object as suitable for use by an ObjectDataSource object. Design-time classes such as the ObjectDataSourceDesigner class use the DataObjectAttribute attribute to present suitable objects to bind to an ObjectDataSource object. 
Grz, Kris.
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