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RadDropDownListElementSelectAll Method
Selects all items if the SelectionMode allows it.

Namespace: Telerik.WinControls.UI
Assembly: Telerik.WinControls.UI (in Telerik.WinControls.UI.dll) Version: 2018.2.619.40 (2018.2.619.40)
Syntax
public void SelectAll()
Exceptions
ExceptionCondition
InvalidOperationExceptionSelecting all items is not a valid operation in the current selection mode. SelectionMode = + this.selectionMode.ToString() + .
See Also