ASP.NET Interface Controls - Checkbox - Linked CheckBoxes with Tri-States


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Use the ParentCheckBoxID property to link child check boxes to their parent check boxes.
When a parent check box has checked and unchecked child check boxes, it will be partially checked.
ASP.NET 
<obout:OboutCheckBox runat="server" ID="ChkParent" ... />

<obout:OboutCheckBox runat="server" ID="ChkChild"  ParentCheckBoxID="ChkParent" ... />

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