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How to count all checked nodes of WinForms TreeViewAdv?
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You can get the count for all checked nodes in WinForms TreeViewAdv control by using CheckedNodes property. Refer the below code for your reference.
C#
int checkedCount = treeView1.CheckedNodes.Count;
VB.Net
Dim checkedCount As Integer = treeView1.CheckedNodes.Count
Take a moment to peruse the WinForms TreeViewAdv - CheckBox documentation, to learn more about checkbox with examples.