Q. What trust level is required for Dundas Chart for ASP.NET (Visual Studio 2005)?

A. Dundas Chart for ASP.NET provides extensive AJAX functionality and makes temporary file management more efficient with its HTTP handler. Each of these require certain permissions in order for the control's code to run successfully. This means that if you have customized the trust level for your application, you may need to make changes to the security policy.

• The HTTP handler of Dundas Chart is configured using the web.config file, and will require the ConfigurationPermission. This permission is not granted by default in trust policies for the Medium trust level or lower.
• If AJAX features of the chart are enabled, the SerializationFormatter flag of SecurityPermission is needed. This is not included for the High trust level or lower, and must be added if you use any trust level other than Full.

Unless you have a reason not to, you can set your application's trust level to Full to run Dundas Chart. In other cases, you can customize your Medium or High trust level policy file to include these permissions as described in this MSDN library article.

Medium Trust Additions

The following additions are necessary to the Medium trust level.

Between <SecurityClasses> and </SecurityClasses> tags:

<SecurityClass Name="ConfigurationPermission" 
    Description="System.Configuration.ConfigurationPermission, 
    System.Configuration, Version=2.0.0.0, Culture=neutral, 
	PublicKeyToken=b03f5f7f11d50a3a"
/>

Add the following as a child element of <PermissionSet> element with Name="ASP.Net", add the following:

<PermissionSet Name="ASP.Net">
…
<IPermission
    class="ConfigurationPermission"
    version="1"
    Unrestricted="true"
/>
…
</PermissionSet>

High Trust Additions

The following addition is necessary for High trust levels or lower if AJAX features are enabled.

In the <IPermission> element with class="SecurityPermission", the flag "SerializationFormatter" must be added:

<IPermission
    class="SecurityPermission"
    version="1"
    Flags="Assertion, Execution, ControlThread, ControlPrincipal, 
	       RemotingConfiguration, SerializationFormatter"
/>

Below you can find an example of a customized Medium trust policy file that Dundas Chart for ASP.NET (Visual Studio 2005) can run successfully with AJAX features enabled.