change BackColor of scrollbar in winform app

In Windows Forms (WinForms) applications, the ScrollBar control does not have a BackColor property by default. This means that you cannot directly change the background color of a ScrollBar by setting its BackColor property.

 

you can work around this limitation by creating a custom ScrollBar control by inheriting from the existing ScrollBar control and overriding the OnPaint method to draw your custom background color.

 

using System;
using System.Windows.Forms;

public class CustomScrollBar : VScrollBar
{
    public CustomScrollBar()
    {
        this.SetStyle(ControlStyles.UserPaint, true);
        this.BackColor = Color.Blue; // Set your desired background color
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);

        using (SolidBrush brush = new SolidBrush(this.BackColor))
        {
            e.Graphics.FillRectangle(brush, e.ClipRectangle);
        }
    }
}

we create a custom ScrollBar control named CustomScrollBar and set its BackColor property to the desired background color. We then override the OnPaint method to draw the background color as a rectangle. You can replace Color.Blue with your preferred background color.