I have two multiline textboxes, no wrap (horizontal/vertical scrollbars)

Is there a way I can sync the scrolling so when I scroll one, the other one scrolls?

OK, unfortunately, the regular textbox control doesn't have scroll events. That's a pain. The RichTextbox control, on the other hand, does. So this is easier with a rich text control. You can do the following:

Const WM_USER As Integer = &H400

Const EM_GETSCROLLPOS As Integer = WM_USER + 221

Const EM_SETSCROLLPOS As Integer = WM_USER + 222

Declare Function SendMessage Lib "user32.dll" Alias "SendMessageW" (ByVal hWnd As IntPtr, ByVal msg As Integer, ByVal wParam As Integer, ByRef lParam As Point) As Integer

Private Sub RichTextBox1_VScroll(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RichTextBox1.VScroll

Dim pt As Point

End Sub

Every time you scroll (vertically) on richtextbox1, you set the scroll position on richtextbox2. You can also do the same in the HScroll event to capture horizontal scrolling.

If you *need* to do this with a regular textbox, then you have to create a custom textbox by inheriting the textbox class, and overriding the wndproc method to look for scrolling messages, then fire a custom scrolling event. To keep it simple, I'd rather use the richtextbox control.

I would much rather use a RichTextbox, but I can't. I also need to change the width of the caret (so it resembles a block) and as far as I know, this can only be done in a regular textbox.