Get click event for Graphics in asp.net

We are writing a text in an image using System.Drawing.Graphics.Drawstring. Below code is shown

        Bitmap bitMapImage = new System.Drawing.Bitmap(@"D:\ABC\Chart1.png");
        Graphics graphicImage = Graphics.FromImage(bitMapImage);
        //Smooth graphics is nice.
        graphicImage.SmoothingMode = SmoothingMode.AntiAlias;

        String drawString = "250";
        Font drawFont = new Font("Arial", 12,FontS开发者_运维技巧tyle.Bold);
        SolidBrush drawBrush = new SolidBrush(Color.White);
        PointF drawPoint= new PointF(169.0F, 85.0F); .

        graphicImage.DrawString(drawString, drawFont, drawBrush, drawPoint);

        //Set the content type
        Response.ContentType = "image/jpeg";

        //Save the new image to the response output stream.
        bitMapImage.Save(Response.OutputStream, ImageFormat.Jpeg);

        //Clean house.
        graphicImage.Dispose();
        bitMapImage.Dispose();

The code takes an imagefile and writes the string (here:250).Now when user clicks 250, the new window should get open.

Not sure how to get the click event of 250?

Please help! Thanks

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This is ASP.NET detecting a click on drawn text in an image is possible but far from ideal. You should instead render text using a div or other html element by positioning it over the image and detect clicks on the that instead using javascript.

See Text Blocks Over Image

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It would be easier to render the image to a container like a DIV or SPAN, and add an onclick to container:

<div onclick="doSomething();">
    <!-- rendered image here -->
</div>

You might also look into using an Image Map, like this:

function foo() {
 alert("Hello World!")
}

<img src="/images/someimage.png" usemap="#somemap" />
<map name="somemap">
    <area coords="0,0,82,126" onclick="foo()" nohref="true" href="#" />
</map>