ASP.NET ArrayList

ASP.NET Web Forms - ArrayList object

The ArrayList object is a collection of items that contain a single data value.

Try it - instance

ArrayList DropDownList

ArrayList RadioButtonList

Create ArrayList

The ArrayList object is a collection of items that contain a single data value.

Add an item to ArrayList using the Add() method.

The following code creates an ArrayList object called mycountries and adds four items:

By default, an ArrayList object contains 16 entries. ArrayList can be adjusted to its final size via trimToSize() method:

With the Sort() method, ArrayList can also be sorted alphabetically or numerically:

To reverse-sort, apply the Reverse() method after the Sort() method:

Bind data to ArrayList

ArrayList objects automatically generate text and values for the following controls:

• asp:RadioButtonList
• asp:CheckBoxList
• asp:DropDownList
• asp:Listbox

In order to bind data to the RadioButtonList control, first create a RadioButtonList control (without any asp:ListItem elements) in the .aspx page:

Then add the script that created the list, and bind the values in the list to the RadioButtonList control:

The DataSource property of the RadioButtonList control is set to the ArrayList, which defines the data source for the RadioButtonList control. The DataBind() method of the RadioButtonList control binds the RadioButtonList control to the data source.

Note: Data values are used as the Text and Value properties of the control. To add a Value different from Text, use the Hashtable object or the SortedList object.

That's ASP.NET use of arrayList objects.