The Header property will return the values contained in your C1TreeViewItems, you can get the string value using the following code:
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                    Dim item As C1TreeViewItem = _tree.SelectedItem _textBlock.Text = item.Header.ToString()  | 
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| C# | 
                     
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                    C1TreeViewItem item = _tree.SelectedItem; _textBlock.Text = item.Header.ToString();  | 
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What You've Accomplished
Run your application and observe that the Header property will return the values contained in your C1TreeViewItems.