Is there a way to ensure that the vertical scrollbar remains visible via AutoScroll in WinForms?

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Yes, you can ensure that the vertical scrollbar remains visible by setting the VerticalScroll property to true on the control that has auto-scrolling enabled. This will make the scrollbar always visible, even if the content does not fill up the entire scrolling area.

Here is an example:

// Enable auto-scrolling and show the vertical scrollbar always
panel1.AutoScroll = true;
panel1.VerticalScroll.Visible = true;

You can adjust the properties of the scrollbar, such as its width and appearance, by accessing the VerticalScroll property and setting its properties.

panel1.VerticalScroll.Enabled = true;
panel1.VerticalScroll.Width = 25;
panel1.VerticalScroll.ScrollBarToolTipText = "Scroll up or down";
panel1.VerticalScroll.BackColor = Color.Gray;

By setting these properties, you can customize the appearance and behavior of the vertical scrollbar to meet your needs.