Gets or sets the selection mode of the System.Web.UI.WebControls.ListBox control.
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Use the ListBox.SelectionMode property to specify the mode behavior of the System.Web.UI.WebControls.ListBox control. Setting this property to ListSelectionMode.Single indicates only a single item can be selected from the System.Web.UI.WebControls.ListBox control, while ListSelectionMode.Multiple specifies multiple items can be selected.
The value of the ListBox.SelectionMode property is stored in view state.