arrondir bordure panel

bonjour mactar85
en voici un avec backcolor gradient ,une image background....qui j'espere fera ton bonheur.
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//tu peux personnaliser dans ce  panel 
//•Gradeint Start Color
//•Gradient End Color
//•Border Color
//•Border Width
//•Shadow Offset
//•Round corner radius
//•Panel Image
//•Panel Image location
//.....
using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
 
namespace A1PanelCSharp
{
    // A1Panel class
    public partial class A1Panel : Panel
    {
        int _borderWidth = 1;
        [Browsable(true), Category(A1PanelGlobals.A1Category)]
        [DefaultValue(1)]
        public int BorderWidth
        {
            get { return _borderWidth; }
            set { _borderWidth = value; Invalidate(); }
        }
 
        int _shadowOffSet = 5;
        [Browsable(true), Category(A1PanelGlobals.A1Category)]
        [DefaultValue(5)]
        public int ShadowOffSet
        {
            get
            {
                return _shadowOffSet;
            }
            set { _shadowOffSet = Math.Abs(value); Invalidate(); }
        }
 
        int _roundCornerRadius = 4;
        [Browsable(true), Category(A1PanelGlobals.A1Category)]
        [DefaultValue(4)]
        public int RoundCornerRadius
        {
            get { return _roundCornerRadius; }
            set { _roundCornerRadius = Math.Abs(value); Invalidate(); }
        }
 
        Image _image;
        [Browsable(true), Category(A1PanelGlobals.A1Category)]
        public Image Image
        {
            get { return _image; }
            set { _image = value; Invalidate(); }
        }
 
        Point _imageLocation = new Point(4, 4);
        [Browsable(true), Category(A1PanelGlobals.A1Category)]
        [DefaultValue("4,4")]
        public Point ImageLocation
        {
            get { return _imageLocation; }
            set { _imageLocation = value; Invalidate(); }
        }
 
        Color _borderColor = Color.Gray;
        [Browsable(true), Category(A1PanelGlobals.A1Category)]
        [DefaultValue("Color.Gray")]
        public Color BorderColor
        {
            get { return _borderColor; }
            set { _borderColor = value; Invalidate(); }
        }
 
        Color _gradientStartColor = Color.White;
        [Browsable(true), Category(A1PanelGlobals.A1Category)]
        [DefaultValue("Color.White")]
        public Color GradientStartColor
        {
            get { return _gradientStartColor; }
            set { _gradientStartColor = value; Invalidate(); }
        }
 
        Color _gradientEndColor = Color.Gray;
        [Browsable(true), Category(A1PanelGlobals.A1Category)]
        [DefaultValue("Color.Gray")]
        public Color GradientEndColor
        {
            get { return _gradientEndColor; }
            set { _gradientEndColor = value; Invalidate(); }
        }
 
        public A1Panel()
        {
            this.SetStyle(ControlStyles.DoubleBuffer, true);
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.ResizeRedraw, true);
            this.SetStyle(ControlStyles.UserPaint, true);
            this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
            InitializeComponent();
        }
 
        protected override void OnPaintBackground(PaintEventArgs e)
        {
            base.OnPaintBackground(e);
 
            int tmpShadowOffSet = Math.Min(Math.Min(_shadowOffSet, this.Width - 2), this.Height - 2);
            int tmpSoundCornerRadius = Math.Min(Math.Min(_roundCornerRadius, this.Width - 2), this.Height - 2);
            if (this.Width > 1 && this.Height > 1)
            {
                e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
 
                Rectangle rect = new Rectangle(0, 0, this.Width - tmpShadowOffSet - 1,
                                   this.Height - tmpShadowOffSet - 1);
 
                Rectangle rectShadow = new Rectangle(tmpShadowOffSet, tmpShadowOffSet,
                                   this.Width - tmpShadowOffSet - 1, this.Height - tmpShadowOffSet - 1);
 
                GraphicsPath graphPathShadow = A1PanelGraphics.GetRoundPath(rectShadow, tmpSoundCornerRadius);
                GraphicsPath graphPath = A1PanelGraphics.GetRoundPath(rect, tmpSoundCornerRadius);
 
                if (tmpSoundCornerRadius > 0)
                {
                    using (PathGradientBrush gBrush = new PathGradientBrush(graphPathShadow))
                    {
                        gBrush.WrapMode = WrapMode.Clamp;
                        ColorBlend colorBlend = new ColorBlend(3);
                        colorBlend.Colors = new Color[]{Color.Transparent,
                Color.FromArgb(180, Color.DimGray),
                Color.FromArgb(180, Color.DimGray)};
 
                        colorBlend.Positions = new float[] { 0f, .1f, 1f };
 
                        gBrush.InterpolationColors = colorBlend;
                        e.Graphics.FillPath(gBrush, graphPathShadow);
                    }
                }
 
                // Draw backgroup
                LinearGradientBrush brush = new LinearGradientBrush(rect,
                this._gradientStartColor,
                this._gradientEndColor,
                LinearGradientMode.BackwardDiagonal);
                e.Graphics.FillPath(brush, graphPath);
                e.Graphics.DrawPath(new Pen(Color.FromArgb(180, this._borderColor), _borderWidth), graphPath);
 
                // Draw Image
                if (_image != null)
                {
                    e.Graphics.DrawImageUnscaled(_image, _imageLocation);
                }
            }
        }
    }
    // A1PanelGraphics class
    internal class A1PanelGraphics
    {
        public static GraphicsPath GetRoundPath(Rectangle r, int depth)
        {
            GraphicsPath graphPath = new GraphicsPath();
 
            graphPath.AddArc(r.X, r.Y, depth, depth, 180, 90);
            graphPath.AddArc(r.X + r.Width - depth, r.Y, depth, depth, 270, 90);
            graphPath.AddArc(r.X + r.Width - depth, r.Y + r.Height - depth, depth, depth, 0, 90);
            graphPath.AddArc(r.X, r.Y + r.Height - depth, depth, depth, 90, 90);
            graphPath.AddLine(r.X, r.Y + r.Height - depth, r.X, r.Y + depth / 2);
 
            return graphPath;
        }
    }
 
    // A1PanelGlobals class
    internal class A1PanelGlobals
    {
        public const string A1Category = "A1";
    }
 
}
bon code...................