Chart for .NET
Q. My ASP.NET application includes a chart that is bound
to data stored in SQL Server database. At design time I can view the
data and it is in expected format, but when I execute my application
the chart appears empty.
A. This issue is caused by security restrictions in ASP.NET. By
default the ASP.NET account does not have privileges to access data
stored in SQL server databases. Please refer to the
Data Access Security article in MSDN, as it provides details on
what is going on and what you can do to correct this issue.
Usually the simplest way to correct this issue is to add the line
<identity impersonate="true" /> to your project's
Q. Dundas Chart is not drawing anything when my line
chart only has a single data point.
A. The newest version of Dundas Chart will always display point
markers. If you are using markers on
your points and find that your marker is not displaying for one
point, please upgrade to the latest version. Alternatively, you can
change your series to a point
chart type in the case where there is
only one point.
If you are not using markers then please note that some series types such as
line, spline, area, etc. draw between two points, and therefore require a
minimum of two points in order to draw. To allow your series to perform
normally you will need to add more points to the series. In the case
where you need to provide some feedback when only a single data
point exists, using point markers or switching to another chart type
can solve the problem.
Gauge for .NET
Q. How can I manage the temporary images created on
the web server by Dundas Gauge?
A. We often receive calls from our clients wondering whether
they have to worry about the temporary images generated by
Dundas Gauge, and what is the best approach to delete these
files. The answer is that Dundas Gauge will manage these files
automatically and you do not have to do anything in order to
make it work.
The ImageURL property is used to control where
the temporary images are stored, and the maximum number of image
files allowed on the server. Dundas Gauge will
only use the number of files specified and will add an entry to
the System Event Log in the case where more files are required.
Dundas Gauge also provides a BinaryStreaming mode
of sending images to the client. This mode is used to provide the user
with images without saving temporary files to the hard drive on the
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Diagram for .NET
Q. What advantage does Diagram's new home give me?
A. Corgent is a new wholly owned subsidiary of Dundas Software
Ltd. and is the new home for Dundas Diagram for .NET, now known
officially as Corgent Diagram
Being a full development framework and not a component,
Corgent/Dundas Diagram was different from other Dundas products, and
accordingly needed its own unique identity, best accomplished with a
new name and dedicated site.
This re-introduction significantly benefits previous users of
Dundas Diagram for .NET with additional resources, information and
detail on the benefits of using Corgent Diagram for .NET. The main
deployments of Corgent Diagram, consisting of HMI Diagramming,
Business/Relational Diagramming and Specialized Diagramming are also
expanded to provide resources specific to customers needs.
Previous users of Dundas Diagram for .NET can continue to use
Dundas Diagram, or can download Corgent Diagram (with valid
Maintenance Subscription). Both products can be used side-by-side
without complication. Dundas Diagram files can also be loaded
seamlessly into Corgent Diagram.
As well, Corgent has its own
Support Site which will be run with the same dedication to support
that Dundas prides itself in having.
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