Microsoft
Articles on Microsoft technologies and design, the innovative company founded by Bill Gates.
Let's try to create a simple infographic starting from an XML
file containing data about the carbon dioxide emissions
in Europe.
To position the data on a map, we have to add the latitude and longitude
fields for each european country (we have not to be precise).
To use the data we have to load them into an XML data source,
using the System.Xml.XmlDataSource object, but the problem is that
the object wants the record fields specified as node attributes.
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The SqlDataSource.EnableCaching property allows to save the
results of a specific database query.
When the caching is activated, if you reset EnableCaching to
false, the query result is not retrieved from the cache anymore but it's
re-executed every time.
But surprisingly, if you reset EnableCaching to true again,
the data is retrieved from the old cache.
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Microsoft IIS caches all the style sheets that are placed inside the App_Themes
folder, remembering the ones that are used by the web site pages (by all pages,
not only the current one); the effect is easily visible looking at the HTML code
sent to the client, noting that are included CSS links that were not specified
for the page.
This behavior requires a strong attention on styles inheritance, but also can
make Internet Explorer versions prior to the 9 to overflow the maximum number of
style tags allowed: in these versions the maximum number of style tags is 32 and
all the following ones are ignored.
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