Be.Windows.Forms.HexBox.OnPaintBackground C# (CSharp) Method

        protected override void OnPaintBackground(PaintEventArgs e)
        {
            switch (_borderStyle)
            {
                case BorderStyle.Fixed3D:
                    {
                        if (TextBoxRenderer.IsSupported)
                        {
                            VisualStyleElement state = VisualStyleElement.TextBox.TextEdit.Normal;
                            Color backColor = this.BackColor;

                            if (this.Enabled)
                            {
                                if (this.ReadOnly)
                                    state = VisualStyleElement.TextBox.TextEdit.ReadOnly;
                                else if (this.Focused)
                                    state = VisualStyleElement.TextBox.TextEdit.Focused;
                            }
                            else
                            {
                                state = VisualStyleElement.TextBox.TextEdit.Disabled;
                                backColor = this.BackColorDisabled;
                            }

                            VisualStyleRenderer vsr = new VisualStyleRenderer(state);
                            vsr.DrawBackground(e.Graphics, this.ClientRectangle);

                            Rectangle rectContent = vsr.GetBackgroundContentRectangle(e.Graphics, this.ClientRectangle);
                            e.Graphics.FillRectangle(new SolidBrush(backColor), rectContent);
                        }
                        else
                        {
                            // draw background
                            e.Graphics.FillRectangle(new SolidBrush(BackColor), ClientRectangle);

                            // draw default border
                            ControlPaint.DrawBorder3D(e.Graphics, ClientRectangle, Border3DStyle.Sunken);
                        }

                        break;
                    }
                case BorderStyle.FixedSingle:
                    {
                        // draw background
                        e.Graphics.FillRectangle(new SolidBrush(BackColor), ClientRectangle);

                        // draw fixed single border
                        ControlPaint.DrawBorder(e.Graphics, ClientRectangle, Color.Black, ButtonBorderStyle.Solid);
                        break;
                    }
                default:
                    {
                        // draw background
                        e.Graphics.FillRectangle(new SolidBrush(BackColor), ClientRectangle);
                        break;
                    }
            }
        }