<p>This is the SQL that I want to accomplish:</p>

<pre><code>WHERE domain_nm + '\' + group_nm in ('DOMAINNAME\USERNAME1','DOMAINNAME2\USERNAME2') 
</code></pre>

<p>I can't for the life of me find an appropriate Expression for this. And I don't think I can use two expressions as the domain name and the group name need to be concatenated.</p>

<p>Thanks!</p>

Can you not use two Expressions?
```
```
criteria
  .Add(Expression.In("DomainName", new string[] { "DOMAINNAME", "DOMAINNAME2" }))
  .Add(Expression.In("GroupName", new string[] { "USERNAME1", "USERNAME2" })
```
```
The other option is to use Expression.Sql.