ListItemCollection Class
Assembly: System.Web (in system.web.dll)
The ListItemCollection class represents a collection of ListItem objects. The ListItem objects, in turn, represent the items displayed in list controls, such as the ListBox. To programmatically retrieve ListItem objects from a list control, use one of following methods:
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Use the indexer to get a single ListItem from the collection, using array notation.
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Use the CopyTo method to copy the contents of the collection to a System.Array object, which can then be used to get items from the collection.
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Use the GetEnumerator method to create a System.Collections.IEnumerator implemented object, which can then be used to get items from the collection.
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Use foreach (C#) or For Each (Visual Basic) to iterate through the collection.
The Count property specifies the total number of items in the collection, and is commonly used to determine the upper bound of the collection. You can add and remove items from the collection by using the Add and Remove methods.
The following code example demonstrates creating ListItemCollection objects, adding items to the collections, and removing items from the collections. In the example, the ListItemCollection named listBoxData is used as the data source for a ListBox control called ListBox1, and the ListItemCollection called ddBoxData is used as the data source for a DropDownList control called DropDownList1.