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    <p>Rather than use SendMessage and mark your DLL as unsafe you can use the <code>GetScrollPos</code> and <code>SetScrollPos</code> functions from user32.dll.</p> <p>I've wrapped the code up into your MyTreeView class so it's nicely encapsulated.</p> <p>You just need to call the <code>AddLinkedTreeView</code> method like so:</p> <pre><code>treeView1.AddLinkedTreeView(treeView2); </code></pre> <p>Here's the source for the MyTreeView class.</p> <pre><code>public partial class MyTreeView : TreeView { public MyTreeView() : base() { } private List&lt;MyTreeView&gt; linkedTreeViews = new List&lt;MyTreeView&gt;(); /// &lt;summary&gt; /// Links the specified tree view to this tree view. Whenever either treeview /// scrolls, the other will scroll too. /// &lt;/summary&gt; /// &lt;param name="treeView"&gt;The TreeView to link.&lt;/param&gt; public void AddLinkedTreeView(MyTreeView treeView) { if (treeView == this) throw new ArgumentException("Cannot link a TreeView to itself!", "treeView"); if (!linkedTreeViews.Contains(treeView)) { //add the treeview to our list of linked treeviews linkedTreeViews.Add(treeView); //add this to the treeview's list of linked treeviews treeView.AddLinkedTreeView(this); //make sure the TreeView is linked to all of the other TreeViews that this TreeView is linked to for (int i = 0; i &lt; linkedTreeViews.Count; i++) { //get the linked treeview var linkedTreeView = linkedTreeViews[i]; //link the treeviews together if (linkedTreeView != treeView) linkedTreeView.AddLinkedTreeView(treeView); } } } /// &lt;summary&gt; /// Sets the destination's scroll positions to that of the source. /// &lt;/summary&gt; /// &lt;param name="source"&gt;The source of the scroll positions.&lt;/param&gt; /// &lt;param name="dest"&gt;The destinations to set the scroll positions for.&lt;/param&gt; private void SetScrollPositions(MyTreeView source, MyTreeView dest) { //get the scroll positions of the source int horizontal = User32.GetScrollPos(source.Handle, Orientation.Horizontal); int vertical = User32.GetScrollPos(source.Handle, Orientation.Vertical); //set the scroll positions of the destination User32.SetScrollPos(dest.Handle, Orientation.Horizontal, horizontal, true); User32.SetScrollPos(dest.Handle, Orientation.Vertical, vertical, true); } protected override void WndProc(ref Message m) { //process the message base.WndProc(ref m); //pass scroll messages onto any linked views if (m.Msg == User32.WM_VSCROLL || m.Msg == User32.WM_MOUSEWHEEL) { foreach (var linkedTreeView in linkedTreeViews) { //set the scroll positions of the linked tree view SetScrollPositions(this, linkedTreeView); //copy the windows message Message copy = new Message { HWnd = linkedTreeView.Handle, LParam = m.LParam, Msg = m.Msg, Result = m.Result, WParam = m.WParam }; //pass the message onto the linked tree view linkedTreeView.RecieveWndProc(ref copy); } } } /// &lt;summary&gt; /// Recieves a WndProc message without passing it onto any linked treeviews. This is useful to avoid infinite loops. /// &lt;/summary&gt; /// &lt;param name="m"&gt;The windows message.&lt;/param&gt; private void RecieveWndProc(ref Message m) { base.WndProc(ref m); } /// &lt;summary&gt; /// Imported functions from the User32.dll /// &lt;/summary&gt; private class User32 { public const int WM_VSCROLL = 0x115; public const int WM_MOUSEWHEEL = 0x020A; [DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern int GetScrollPos(IntPtr hWnd, System.Windows.Forms.Orientation nBar); [DllImport("user32.dll")] public static extern int SetScrollPos(IntPtr hWnd, System.Windows.Forms.Orientation nBar, int nPos, bool bRedraw); } } </code></pre> <p><strong>Edit</strong>: Added forwarding of the WM_MOUSEWHEEL message as per MinnesotaFat's suggestion.</p>
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