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    <blockquote> <p><strong>Problem</strong>: In my WPF version, I am setting the textbox's text to empty (as a test), which occurs, but afterwards the TreeViewItem's header text is being pasted which is not what I want.</p> </blockquote> <p>I think a parent UI element is handling (and therefore overriding) the <code>Drop</code> event so you're not getting the results you expect. As a matter of fact, when trying to recreate your issue, I couldn't even get my TextBox.Drop event to fire. However, using the TextBox's PreviewDrop event, I was able to get what (I think) is your expected result. Try this:</p> <pre><code> private void textBox1_PreviewDrop(object sender, DragEventArgs e) { TextBox tb = sender as TextBox; if (tb != null) { // If the DataObject contains string data, extract it. if (e.Data.GetDataPresent(DataFormats.StringFormat)) { string fileName = e.Data.GetData(DataFormats.StringFormat) as string; using (StreamReader s = File.OpenText(fileName)) { ((TextBox)sender).Text = s.ReadToEnd(); } } } e.Handled = true; //be sure to set this to true } </code></pre> <p>I think that code snippet should answer most of the questions you posed except for this one:</p> <blockquote> <p>Why is TreeViewItem node always null in the WPF version?</p> </blockquote> <p>The <code>DataObject</code> you are passing in the DragDrop event does not support passing a <code>TreeViewItem</code>. In your code (and mine) we specify that the data format will be <code>DataFormats.StringFormat</code> which cannot be cast to a <code>TreeViewItem</code>.</p>
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    1. COThanks, I needed `e.Handled = true` and to fix how I was checking `e.Data`.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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