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The ImageSave() approach demonstrated so far has one problem When you save an image to the response stream, you overwrite whatever information ASPNET would otherwise use If you have a web page that includes other content and controls, this content won t appear at all in the final web page Instead, the dynamically rendered graphics replace it Fortunately, this has a simple solution: you can link to a dynamically generated image using the HTML <img> tag or the Image web control But instead of linking your image to a fixed image file, link it to the aspx file that generates the picture For example, you could create a file named GraphicalTextaspx that writes a dynamically generated image to the response stream In another page, you could show the dynamic image by adding an Image web control and setting the ImageUrl property to GraphicalTextaspx.

In fact, you ll even see the image appear in Visual Studio s design-time environment before you run the web page! When you use this technique to embed dynamic graphics in web pages, you also need to think about how the web page can send information to the dynamic graphic For example, what if you don t want to show a fixed piece of text, but instead you want to generate a dynamic label that incorporates the name of the current user (In fact, if you do want to show a fixed piece of text, it s probably better to create the graphic ahead of time and store it in a file, rather than generating it using GDI+ code each time the user requests the page) One solution is to pass the information using the query string, as described in 7.

Multiple style sheets can be called by passing an array in the path parameter: < =$html->css(array('reset','type','layout')); > The CSS function is generally used in layouts but can also be called in individual view files.

The page that renders the graphic can then check for the query string information it needs Here s how you d rewrite the dynamic graphic generator with this in mind: ' Get the user name If RequestQueryString("Name") Is Nothing Then ' No name was supplied ' Don't display anything Else Dim name As String = RequestQueryString("Name") ' Create an in-memory bitmap where you will draw the image Dim image As New Bitmap(300, 50) ' Get the graphics context for the bitmap Dim g As Graphics = GraphicsFromImage(image) gFillRectangle(BrushesLightYellow, 0, 0, 300, 50) gDrawRectangle(PensRed, 0, 0, 299, 49) ' Draw some text based on the query string Dim font As New Font("Alba Super", 20, FontStyleRegular) gDrawString(name, font, BrushesBlue, 10, 0) ' Render the entire bitmap to the HTML output stream imageSave(ResponseOutputStream, _ SystemDrawingImagingImageFormatGif).

g.Dispose() image.Dispose() End If Conceptually, this code isn t much different than the examples you ve seen before. The only change is that one piece of information the string that s used with the DrawString() method is retrieved from the query string. Figure 12-8 shows a page that uses this dynamic graphic page, along with two Label controls. The page passes the query string argument Joe Brown to the page. The full Image.ImageUrl thus becomes GraphicalText.aspx Name=Joe%20Brown, as shown here: <asp:Label id="Label1" runat="server">Here is some content.</asp:Label> <br /><br /> <asp:Image id="Image1" runat="server" ImageUrl="GraphicalText2.aspx Name=Joe%20Brown"></asp:Image> <br /><br /> <asp:Label id="Label2" runat="server">Here is some more content.</asp:Label>

Figure 2-7. Setting up a one-variable data table with input values across a row (panes split for readability)

Figure 12-8. Mingling custom images and controls on the same page It s possible that you might need to send more information or more complex information to the page that draws the image. For example, you might want to pass a data object to a page that draws a pie chart. In this case, the query string isn t good enough, and you ll need to use a different type of state management. One option is session state, as described in 8.