How to avoid winforms treeview icon changes when item selected

Simply set the SelectedImageIndex for each node to the same value as ImageIndex. So, if you’re creating your node programatically:

        TreeNode node = new TreeNode("My Node");
        node.ImageIndex = 1;
        node.SelectedImageIndex = 1;

Or you can specify the whole lot in the constructor:

        TreeNode node = new TreeNode("My Node", 1, 1);

You can do the same thing using the design time editor if you’re adding nodes at design time. You just need to set the SelectedImageIndex at the node level and not at the TreeView level.