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    <p>Following <A href="http://stackoverflow.com/users/18941/thesoftwarejedi">TheSoftwareJedi's</A> suggestion, I ran some tests, and conclusively proved that it's the use of the PROG_Delegate that causes the exception.</p> <p>If I use MethodInvoker, the code runs without error.</p> <pre><code> private delegate void PROG_Delegate&lt;TGridLine&gt;(DataGridView dgv, IEnumerable&lt;TGridLine&gt; gridLines, string[] columns); public static void PopulateReadOnlyGrid&lt;TGridLine&gt;(DataGridView dgv, IEnumerable&lt;TGridLine&gt; gridLines, string[] columns) { if (dgv.InvokeRequired) { dgv.BeginInvoke(new MethodInvoker(delegate() { PopulateReadOnlyGrid(dgv, gridLines, columns); })); return; } GridUtils.StatePreserver statePreserver = new GridUtils.StatePreserver(dgv); System.Data.DataTable dt = CollectionHelper.ConvertToDataTable&lt;TGridLine&gt;((gridLines)); dgv.DataSource = dt; dgv.DataMember = ""; dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells; GridUtils.OrderColumns&lt;TGridLine&gt;(dgv, columns); statePreserver.RestoreState(); dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None; } </code></pre> <p>If I put the PROG_Delegate back in and remove <i>everything else</i> I get the exception back.</p> <pre><code> private delegate void PROG_Delegate&lt;TGridLine&gt;(DataGridView dgv, IEnumerable&lt;TGridLine&gt; gridLines, string[] columns); public static void PopulateReadOnlyGrid&lt;TGridLine&gt;(DataGridView dgv, IEnumerable&lt;TGridLine&gt; gridLines, string[] columns) { if (dgv.InvokeRequired) { dgv.BeginInvoke ( new PROG_Delegate&lt;TGridLine&gt;(PopulateReadOnlyGrid&lt;TGridLine&gt;), new object[] { dgv, gridLines, columns } ); } //GridUtils.StatePreserver statePreserver = new GridUtils.StatePreserver(dgv); //System.Data.DataTable dt = CollectionHelper.ConvertToDataTable&lt;TGridLine&gt;((gridLines)); //dgv.DataSource = dt; //dgv.DataMember = ""; //dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells; //GridUtils.OrderColumns&lt;TGridLine&gt;(dgv, columns); //statePreserver.RestoreState(); //dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None; } </code></pre> <p>So, there's an easy workaround, and the use of the MethodInvoker makes the code more succinct and readable.</p> <p>On a theoretical level, there's still the question as to why it's crashing, given that the PROG_Delegate is legal and it's working for other people. I suspect the best answer we can come to is "some obscure bug", which will remain obscure because coders prefer to use Method Invoker anyway.</p>
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    1. PO"CLR detected an invalid program." when calling Generic Methods
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    1. USAndrew Stapleton
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