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    <p>Here's what ended up working really well.</p> <p>First, the ugly (but necessary) part - mapping where all of the booths are and storing the values. So, for booth1 we would store the four corner points of the area we wanted to highlight.</p> <p>On the image, we use a normal asp:image, but set the ImageUrl to BoothMap.ashx, a handler we've designed to draw the booth locations, sending in the booth location in the querystring. So, it might look like...</p> <pre><code>&lt;asp:Image ID="imgBoothMap" ImageUrl="BoothMap.ashx?ID=A1" runat="server" /&gt; </code></pre> <p>Our handler looks something like this... </p> <pre><code> &lt;%@ WebHandler Language="C#" Class="BoothMap" %&gt; using System.Drawing; using System.Drawing.Imaging; using System.Web; public class BoothMap : IHttpHandler { public void ProcessRequest (HttpContext context) { context.Response.ContentType = "image/jpg"; //load booth corners Point[] points = GetBoothCorners(context.Request.QueryString["ID"]); Image curImage = Image.FromFile(@"C:\BoothMap.jpg"); Graphics g = Graphics.FromImage(curImage); Pen transPen = new Pen(Color.FromArgb(128, 132, 112, 255), 10); Brush transBrush = new SolidBrush(Color.FromArgb(128, 132, 112, 255)); g.FillPolygon(transBrush, points); curImage.Save(context.Response.OutputStream, ImageFormat.Jpeg); g.Dispose(); curImage.Dispose(); context.Response.End(); } public bool IsReusable { get { return true; } } } </code></pre> <p>All this provides the framework for us to highlight map locations in ASP.Net. If we wanted to, we could easily modify the code to highlight multiple areas of the map, change colors, etc.</p>
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    1. POHighlighting Areas on Image in ASP.Net
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    1. USjcelgin
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      1. VTUpMod
    1. COThe reason it was done like this (and not using jQuery) is because the rest of the site architecture didn't really lend itself to jQuery or more importantly, a good means to pull the necessary data from the DB. Having to do it all entirely server-side, this worked fine.
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    2. CODoesn't look bad. The only thing I would change would be to use the `using` pattern on those `IDisposable` objects, just in case.
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      1. USAndrew Barber
 

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