private void PopulateTreeView(string dirPath)
{
treeView1.Nodes.Clear();
TreeNode rootNode;
DirectoryInfo info = new DirectoryInfo(@dirPath);
if (info.Exists)
{
rootNode = new TreeNode("Aspose.Cells");
rootNode.Tag = info;
treeView1.Nodes.Add(rootNode);
GetDirectories(info.GetDirectories(), rootNode);
rootNode.ExpandAll();
}
}