Chart for .NET
Q. My ASP.NET control does not work properly with Chart version 5.5 with AJAX
and I am receiving a System.NullReferenceException.
A. The event validation for some ASP.NET controls (such as the ListBox and HtmlInputText
controls) are not suitable to be used with AJAX. To solve this problem, please do one of the following:
- On the top of the ASP page set EnableEventValidation =
"false", e.g. <%@ Page ... EnableEventValidation = "false" %>
- Instead of using an ASP.NET control, consider using the HTML equivalent instead. For example, if an ASP.NET ListBox
is being used then the select tag can be used instead: <select
Chart for .NET - OLAP Services
Q. How can I save the OLAP chart to an Excel file?
A. Dundas Chart .NET - OLAP Services version 5.5 allows you to
save the data in your chart to an Excel file. In the sample
framework included with our ASP.NET solution there is a sample which
demonstrates how to do this named "Creating a Custom Layout using OLAP Services". If you
are using Windows Forms, then please consult the full article
which contains a code snippet on how to accomplish this using
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Gauge for .NET
Q. Can Dundas Gauge for ASP.NET support the 508
A. Since Dundas Gauge is normally generated as an image on the
client browser, the only part of these standards applicable to Gauge is section 1194.22 paragraph a: non-text
elements must be described by an "alt" or
To set these attributes within Gauge, code similar to the following
can be used:
GaugeContainer1.Attributes["alt"] = "Gauge with
a value of " + GaugeContainer1.Values.Value;
If you are using map areas in the Gauge, for example by setting
tooltips, hyperlinks, or the MapAreaAttributes
property on any gauge element, you should also set an "alt"
attribute in the MapAreaAttributes property or
add one to it: MapAreaAttributes
= "alt='Alternative text'";.
Q. I'm using Internet Explorer 7 and the
Sample Framework for Dundas Gauge and/or Online Documentation is very slow.
A. This is an issue which was found and fixed by Microsoft within
Internet Explorer 7. To get the fix for IE7, please visit
http://support.microsoft.com/?id=928089. Once IE7 is
patched, the issue will no longer occur.
Map for .NET
Q. How can I improve the performance of Dundas Map?
A. There are a number of things that can be modified in order to
make Map perform better. These include: Content Caching (ASP.NET),
Optimize for Panning (WinForms), Simplification, Detail Hiding and
Loading Shape Files at run-time. One option may have more impact
on your project than another depending on what functionality your solution
so it is left to the developer's discretion to make the choice of
which to use. Each option is discussed in more detail within the
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Map for Reporting Services
Q. I'm having problems using Dundas Map for
Reporting Services on a 64-bit machine after the install.
A. Normally the installer will copy RSMapInstaller.exe and run
it at the end of the install process. However, if you are using a
64-bit machine, the installer may fail to run this file. In this
case it is possible to run the file yourself in order to complete
the install process. To run the RSMapInstaller.exe file
manually, navigate to C:\Program Files (x86)\Dundas
Software\Maps\Reporting Services\Tools (default install
location). If this does not solve the issue, please refer to the
full article for manual installation steps.
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