Horizontal divider of the StatusStrip

Question

In a Windows.Forms application, I want to change the color of the horizontal divider line of the StatusStrip, or make this line invisible. Any ideas?

This is the I'm referring to:

file: Program.cs

using System;
using System.Data;
using System.Drawing;
using System.Data.Linq;
using System.Windows.Forms;

namespace test {
    class Program {

        [STAThread]

        static void Main() {
            Application.Run(new FormMain());
        }
    }
}

file: FormMain.cs

using System;
using System.Data;
using System.Drawing;
using System.Data.Linq;
using System.Windows.Forms;

namespace test {
    class Vars {
        public class Colors {
            public static Color BackRed = Color.FromArgb(040, 000, 000);
            public static Color ForeRed = Color.FromArgb(240, 120, 120);
            public static Color BackGrn = Color.FromArgb(000, 040, 000);
            public static Color ForeGrn = Color.FromArgb(120, 240, 120);
            public static Color BackBlu = Color.FromArgb(000, 000, 040);
            public static Color ForeBlu = Color.FromArgb(120, 120, 240);
        }
    }

    class FormMain : Form {
        MenuStrip menuStrip = new MenuStrip();
        StatusStrip statusStrip = new StatusStrip();

        public FormMain() {
            this.FormMain_Setup();
        }

        private void FormMain_Setup() {
            this.Top = 20;
            this.Left = 20;
            this.Width = 1200;
            this.Height = 675;
            this.BackColor = Vars.Colors.BackBlu;
            this.ForeColor = Vars.Colors.ForeBlu;
            this.MaximizeBox = false;
            this.StartPosition = FormStartPosition.Manual;
            this.FormBorderStyle = FormBorderStyle.Fixed3D;
            this.KeyDown += FormMain_KeyDown;
            this.FormMain_MenuStrip_Setup();
            this.FormMain_StatusStrip_Setup();
        }

        private void FormMain_StatusStrip_Setup() {
            this.statusStrip.Height = 30;
            this.statusStrip.AutoSize = false;
            this.statusStrip.BackColor = Vars.Colors.BackRed;
            this.statusStrip.ForeColor = Vars.Colors.ForeRed;
            this.statusStrip.SizingGrip = false;
            this.Controls.Add(statusStrip);
        }

        private void FormMain_MenuStrip_Setup() {
            this.menuStrip.Height = 30;
            this.menuStrip.AutoSize = false;
            this.menuStrip.BackColor = Vars.Colors.ForeGrn;
            this.menuStrip.ForeColor = Vars.Colors.BackGrn;
            this.Controls.Add(menuStrip);
        }

        private void FormMain_KeyDown(object sender, KeyEventArgs e) {
            this.FormMain_Exit();
        }

        private void FormMain_Exit() {
            this.Close();
        }
    }
}

Answer 1

When I add Application.EnableVisualStyles(); into Main() that problem line disappeared.

namespace test {
    class Program {

        [STAThread]

        static void Main() {
            Application.EnableVisualStyles(); // this line added
            Application.Run(new FormMain());
        }
    }
}

Answer 2

I found this 6+ years old question while I was googling around. I don't think it remains a problem for the OP. Just for the future readers.

---

When you add a StatusStrip instance by the designer or code, you will see a thin horizontal line over the top of the control.

You can get rid of this line by explicitly set the StatusStrip.BackColor property to any color. In the designer, change the color to anything and set it back to the inherited one (the Form's) and it will disappear. Alternatively, in code, set the property to itself:

private void FormMain_StatusStrip_Setup()
{
    this.statusStrip.BackColor = this.statusStrip.BackColor;
    //...
}

See Winforms ToolStrip.BackColor returns wrong color for more details about this behavior.

---

In your case, obviously the BackColor trick has no effect, the line remains as we can see in your image. This could be a result of a custom ToolStripRenderer if you have one assigned to the StatusStrip.Renderer property which uses the default values and ways to render the strips including the borders.

Consider this example:

public class FormMain
{
    public FormMain() : base()
    {
        this.BackColor = Color.Black;
        this.statusStrip.Renderer = new MyCustomRenderer();
    }
}

public class MyCustomRenderer : ToolStripProfessionalRenderer
{
    public MyCustomRenderer() : base(new MyColorTable()) { }
}

public class MyColorTable : ProfessionalColorTable
{
    public override Color StatusStripGradientBegin => Color.Black;
    public override Color StatusStripGradientEnd => Color.Black;
    // ...
}

Here, you need to override the renderer's OnRenderToolStripBorder method to prevent drawing the border of the StatusStrip.

public class MyCustomRenderer : ToolStripProfessionalRenderer
{
    public MyCustomRenderer() : base(new MyColorTable()) { }

    protected override void OnRenderToolStripBorder(ToolStripRenderEventArgs e)
    {
        if (!(e.ToolStrip is StatusStrip)) base.OnRenderToolStripBorder(e);
    }
}

Or maybe to draw the line with a color of your choice:

protected override void OnRenderToolStripBorder(ToolStripRenderEventArgs e)
{
    if (e.ToolStrip is StatusStrip)
        e.Graphics.DrawLine(Pens.Red, 0, 0, e.ToolStrip.Width, 0);
    else
        base.OnRenderToolStripBorder(e);
}