creating graphs from online data


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Thread: creating graphs from online data

  1. #1
    francis Guest

    creating graphs from online data


    Greetings! I'm new to ASP and I would like to know how I can write a VB.net
    application to read some data(eg a pricing list) from a web page, store it
    in a database, and plot a graph from the data saved. Any advice will be greatly
    appreciated. Thanks.

    Yours,
    Francis Tan

  2. #2
    Russell Jones Guest

    Re: creating graphs from online data

    You'll need to use the System.Net classes to make a WebRequest to get the
    data.
    Store the data using the System.Data classes appropriate to your database.
    Look at the System.Drawing classes to draw the graph.
    Look at the HttpResponse object to send the graph back to the browser. Pay
    attention to the ContentType property to send the image data. Think of the
    response as two separate requests by the browser--the first to get the page,
    and the second to get the graph image. Make the browser perform the second
    request by putting an <img> tag into the first response where the src
    attribute points back to a page that serves the image data, e.g. <img
    src="getGraph.aspx">.

    Let us know where you get stuck.



    "francis" <francistsp@yahoo.com> wrote in message
    news:3e6da8c8$1@tnews.web.devx.com...
    >
    > Greetings! I'm new to ASP and I would like to know how I can write a

    VB.net
    > application to read some data(eg a pricing list) from a web page, store it
    > in a database, and plot a graph from the data saved. Any advice will be

    greatly
    > appreciated. Thanks.
    >
    > Yours,
    > Francis Tan




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