How to change the background color of unused space tab in C# winforms?

Question

Ex

  |Tab1|Tab2|Tab3| {    }
  |                     |
  |                     |
  |                     |
  |                     |
  |____________________         


        

Answer 1

I think the only way to give that space a color is to override the OnPaintBackground method of the window, so just paste this on your form (window)

you must also change the Appearance Property to "Normal"

private void Form1_Load(object sender, EventArgs e)
{

}

protected override void OnPaintBackground(PaintEventArgs e)
{
    base.OnPaintBackground(e);
    Rectangle lasttabrect = tabControl1.GetTabRect(tabControl1.TabPages.Count - 1);
    RectangleF emptyspacerect = new RectangleF(
            lasttabrect.X + lasttabrect.Width + tabControl1.Left,
            tabControl1.Top + lasttabrect.Y, 
            tabControl1.Width - (lasttabrect.X + lasttabrect.Width), 
            lasttabrect.Height);

    Brush b = Brushes.BlueViolet; // the color you want
    e.Graphics.FillRectangle(b, emptyspacerect );
}

for me it's working perfectly