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private void simpleButton3_Click(object sender, EventArgs e)
{
var curNode = treeList1.FocusedNode;
var preNode = treeList1.FocusedNode.PrevNode;
if(preNode != null)
{
var curNodeIndex = treeList1.GetNodeIndex(curNode);
var preNodeIndex = treeList1.GetNodeIndex(preNode);
treeList1.SetNodeIndex(curNode, preNodeIndex);
treeList1.SetNodeIndex(preNode, curNodeIndex);
}
}