c# - How to change pen color

Change Pen Color
PenColorProperty.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Text" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="System.Drawing.Imaging" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        Bitmap bmp = new Bitmap(500,250);
        Graphics g = Graphics.FromImage(bmp);
        g.Clear(Color.YellowGreen);

        Pen drawingPen = new Pen(Color.MediumSeaGreen, 2);

        Point p1 = new Point(100, 50);
        Point p2 = new Point(400, 50);

        g.DrawLine(drawingPen, p1, p2);

        Point p3 = new Point(100, 100);
        Point p4 = new Point(400, 100);

        drawingPen.Color = Color.Snow;
        g.DrawLine(drawingPen, p3, p4);

        String path = Server.MapPath("~/Image/PenColorProperty.jpg");
        bmp.Save(path,ImageFormat.Jpeg);

        Image1.ImageUrl = "~/Image/PenColorProperty.jpg";
        g.Dispose();
        bmp.Dispose();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>asp.net drawing - how to set change Pen Color Property</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DodgerBlue; font-style:italic;">
            How to set change Pen Color Property in asp.net drawing
            <br />Pen.Color Property
        </h2>
        <hr width="500" align="left" color="DeepSkyBlue" />
        <asp:Image
             ID="Image1"
             runat="server"
             />
        <br />
        <asp:Button 
            ID="Button1"
            runat="server"
            OnClick="Button1_Click"
            Text="Test Pen Color Property"
            Height="45"
            Font-Bold="true"
            ForeColor="DodgerBlue"
            />
    </div>
    </form>
</body>
</html>
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