The properties of some Web server controls are not simple values or objects, but collections. For example, the individual values of a ListBox Web server control are implemented as a collection of ListItem objects.

To set a collection-based control property

Instantiate the item you want to use, and then add it to the control's collection.

The following code example shows how to add a ListItem object to a ListBox control by adding it to the control's Items collection. In the first example, the item is explicitly created before being added. In the second example, items are created and added at the same time.

Visual BasicВ	Copy Code
Dim li As ListItem = New ListItem("Item 1") ListBox1.Items.Add(li) ' Create and add the items at the same time ListBox1.Items.Add(New ListItem("Apples")) ListBox1.Items.Add(New ListItem("Oranges")) ListBox1.Items.Add(New ListItem("Lemons"))

Visual BasicВ

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Dim li As ListItem = New ListItem("Item 1")
ListBox1.Items.Add(li)

' Create and add the items at the same time
ListBox1.Items.Add(New ListItem("Apples"))
ListBox1.Items.Add(New ListItem("Oranges"))
ListBox1.Items.Add(New ListItem("Lemons"))

C#В	Copy Code
// Create the items and then add them to the list. ListItem li = new ListItem("Item 1"); ListBox1.Items.Add(li); // Create and add the items at the same time. ListBox1.Items.Add(new ListItem("Apples")); ListBox1.Items.Add(new ListItem("Oranges")); ListBox1.Items.Add(new ListItem("Lemons"));

C#В

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// Create the items and then add them to the list.
ListItem li = new ListItem("Item 1");
ListBox1.Items.Add(li);

// Create and add the items at the same time.
ListBox1.Items.Add(new ListItem("Apples"));
ListBox1.Items.Add(new ListItem("Oranges"));
ListBox1.Items.Add(new ListItem("Lemons"));

To set a collection-based control property

See Also

Tasks

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