Question

I need to replicate this window’s bottom part to use in my own Form.

Answer 1

What you need to do is override the painting of an existing control or create your own control. Personally, I’d override the painting of a Panel control, which would then be the panel for the entire bottom section of your window.

A Gradient Panel is a common requirement and there is a blog post for it here (code provided below).

Obviously you don’t want to paint a full gradient, but it demonstrates how the painting works on the control.

You can either paint a gradient using a smaller subset of the entire panel or paint using something like Graphics.DrawPath and draw your straight line at the correct colour.

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Blog Post Code (to avoid dead links):

using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace PostXING.Controls
{
    /// <summary>
    /// GradientPanel is just like a regular panel except it optionally  
    /// shows a gradient.
    /// </summary>
    [ToolboxBitmap(typeof(Panel))]
    public class GradientPanel : Panel
    {
        /// <summary>
        /// Property GradientColor (Color)
        /// </summary>
        private Color _gradientColor;
        public Color GradientColor {
            get { return this._gradientColor;}
            set { this._gradientColor = value;}
        }

        /// <summary>
        /// Property Rotation (float)
        /// </summary>
        private float _rotation;
        public float Rotation {
            get { return this._rotation;}
            set { this._rotation = value;}
        }

        protected override void OnPaint(PaintEventArgs e) {
                        if(e.ClipRectangle.IsEmpty) return; //why draw if non-visible?

            using(LinearGradientBrush lgb = new 
                           LinearGradientBrush(this.ClientRectangle, 
                      this.BackColor, 
                      this.GradientColor, 
                      this.Rotation)){
                e.Graphics.FillRectangle(lgb, this.ClientRectangle);
            }

                        base.OnPaint (e); //right, want anything handled to be drawn too.
        }
    }
}