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PONonblocking update to a DataGridView
 

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    <p>I understand how to use delegates to update controls on the main control thread, works like a charm. My problem here is if I'm adding a large <code>DataSet</code> (say 2000 items) to a bound <code>DataGridView</code>, it takes 5-8 seconds for the grid to populate and during that 5-8 seconds the whole GUI is locked. How can I update the <code>DataGridView</code> such that it doesn't lock the user interface?</p> <p>To be clear, the problem isn't that I'm doing a slow query to a database and the UI is blocking on that, I already have the <code>DataSet object[]</code> and adding the array of objects to a <code>BindingList&lt;object&gt;</code> which the <code>DataGrid</code> is bound to so:</p> <pre><code>BindingList&lt;object&gt; dataProvider = new BindingList&lt;object&gt;(); DataGridView gridView = new DataGridView(); gridView.DataSource = dataProvider; // ...stuff happens... object[] source = dataSet; //of 2000 items foreach (object item in source) { //this foreach blocks dataProvider.Add(item); } </code></pre> <p>I tried various things (that I knew wouldn't work but figured I'd see) like creating a delegate that did the <code>dataProvider.Add()</code>, but that didn't matter since it still had to happen on the control thread.</p> <p>A couple good suggestions revolved around building the <code>BindingList</code> first and then setting the <code>gridView.DataSource</code>. While this works (it updates the grid instantly), the only way I see to add more data is to create another new <code>BindingList</code>, do a <code>gridView.DataSource.copyTo()</code> (to get the existing data) and add the new data on top of that, then set the <code>gridView.DataSource</code> to the new <code>BindingList</code>. This won't work for me since the objects in my list are not static, they are each uploading data to a server asynchronously, and copying them to a new <code>BindingList</code> would cause problems.</p>
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