<p>This question is about App domains and Sessions. Is it possible to have IIS run each User Session in a seperate App Domain. If Yes, Could you please let me settings in the config file that affect this.</p>

<p>Regards,
Anil.</p>

I assume you mean anonymous types here, e.g.
```
new { Name1=value1, Name2=value2}
```
etc. If so, you're out of luck - anonymous types are normal types in that they're fixed, compiled code. They just happen to be autogenerated.
What you
could
do is write
```
new { old.Name1, old.Name2, ID=myId }
```
but I don't know if that's really what you want. Some more details on the situation (including code samples) would be ideal.
Alternatively, you could create a container object which
always
had an ID and whatever other object contained the rest of the properties.