I have a property I've set within a CustomAction that I need to access
within one of my Components. I'm not getting the property's value. Is this
even possible?

Here is where I'm assigning a value to my property.

[CustomAction]
public static ActionResult TestSqlConnection(Session testSession)
{
       // Code that tests the connection.
      ...
      ...

      // Assign the connection string to a property.
      testSession["SQLCONNECTION"] = connStr;
}

Within my Components.wxs I have the following.
<Component Id="CMP_ConnString" Guid="Some Guid" Directory="AppDir">
   <File Id="App.config" Name="app.config" Vital="yes" KeyPath="yes"
Source="..\MyApp\app.config" />
   <util:XmlFile Id="AppConfigConnString" Action="setValue" Permanent="yes"
File="App.config"

Element="/configuration/connectionStrings/add[\[]@name='MyAppConnString'[\]]"
         Name="connectionString" Value="[SQLCONNECTION]" />
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