I have to generate thumbnails from some images when my module displays a list with employee from our database. I already found tutorials like http://aspnet.4guysfromrolla.com/articles/012203-1.aspx and http://www.sitepoint.com/article/generating-asp-net-images-fly/ but all of them are working with something like this:

<img src="ShowImage.aspx?img=/images/BillGates.jpg" />

..where ShowImage.aspx is a web control which takes the URL to an image and then outputs the corresponding thumbnail. Now my problem is not writing the ShowImage.aspx, but where to save it or how it can be accessed when just storing it in the module folder as direct accessing ascx files in the DNN folders is forbidden (e.g. when storing the file in my modules folder, then <img src="myDNN/DesktopModules/myModule/ShowImage.aspx?img=billGates.jpg" /> won't work as it would have to directly access the ShowImage.aspx)

I tried it this way now, can anyone confirm if this is correct and robust? My thumbnailGenerator is in my module folder:

string url_thumbnailGenerator = "http://" + Request.Url.Host + ":" + Request.Url.Port + TemplateSourceDirectory + "/DisplayThumbnail.aspx";

// output> http://localhost:1234/myDNNinstall/DesktopModules/MyModule/DisplayThumbnail.aspx

where TemplateSourceDirectory is a DNN variable which (obviously?) returns the path to the module directory relative to http://server/DNN/. It works, but I am not sure, if there is a better way..