Use the PartialCheck property to determine whether the folder is partially checked. The Check property determines whether the folder is checked or unchecked. Use the HasCheckBoxes property to assign a check box to each folder in the control's list. Use the PartialCheck property to enable partial check feature. This way, if a folder is checked, it's parent folder is partial checked, if it contains un-checked folders, or full checked, if all child folders are checked.