Wix Session Object

Does anyone know at what point this object is still available?

I am trying to create a custom action called as follws:

         <Control Id="Test_Button" Type="PushButton" X="100" Y="100" Width="56" Height="17" Text="Test">
            <Publish Event="DoAction" Value="TestDatabaseConnection.SetProperties">1</Publish>
            <Publish Event="DoAction" Value="TestDatabaseConnection">1</Publish>
          </Control>

I have also defined

<CustomAction Id="TestDatabaseConnection.SetProperties" Property="TestDatabaseConnection" Value="CONNECTIONPROVIDER=[CONNECTIONPROVIDERNAME];PRIMARY_SERVER=[SERVER];PRIMARY_USERID=[USERID];PRIMARY_PASSWORD=[PASSWORD];"/>
<CustomAction Id="TestDatabaseConnection" BinaryKey="WixCustomActions" DllEntry="TestDatabaseConnection"/>

But I keep getting an error in the custom action, and it down to when I try and retrieve the set parameters.

I.e.

server = session.CustomActionData["PRIMARY_SERVER"];

boom it blows up

Action ended 13:11:46: TestDatabaseConnection. Return value 3.
DEBUG: Error 2896:  Executing action TestDatabaseConnection failed.
The installer has encounte开发者_运维知识库red an unexpected error installing this package. This may indicate a problem with this package. The error code is 2896. The arguments are: TestDatabaseConnection, , 

This code works when put at the end of the execution cycle but now I want to call it when a button is pressed.

Any clues?

You only serialize and deserialize properties through a CustomActionData class for deferred CA's. Immeadiate Ca's ( like when called from DoAction control events ) don't need this and it won't work.