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    <p>Ok, first to directly answer your question (but read on for words of caution ;)), there is a way, albeit a finicky one, to do what you want.</p> <pre><code>// IQueryable&lt;Customer&gt; L2S query definition, db is DataContext (AdventureWorks) var cs = from c in db.Customers select c; // extract command and append your stuff DbCommand dbc = db.GetCommand(cs); dbc.CommandText += " WHERE MiddleName = 'M.'"; // modify command and execute letting data context map it to IEnumerable&lt;T&gt; var result = db.ExecuteQuery&lt;Customer&gt;(dbc.CommandText, new object[] { }); </code></pre> <p>Now, the caveats.</p> <ol> <li>You have to know which query is generated so you would know how to modify it, this prolongs development. </li> <li>It falls out of L2S framework and thus creates a possible gaping hole for sustainable development, if anyone modifies a Linq it will hurt.</li> <li>If your Linq causes parameters (has a where or other extension causing a WHERE section to appear with constants) it complicates things, you'll have to extract and pass those parameters to ExecuteQuery</li> </ol> <p>All in all, possible but very troublesome. That being said you should consider using .Where() extension as <a href="https://stackoverflow.com/users/51/yaakov-ellis">Yaakov</a> suggested. If you want to centrally controll security on object level using this approach you can create an extension to handle it for you</p> <pre><code>static class MySecurityExtensions { public static IQueryable&lt;Customer&gt; ApplySecurity(this IQueryable&lt;Customer&gt; source) { return source.Where(x =&gt; x.MiddleName == "M."); } } //... // now apply it to any Customer query var cs = (from c in db.Customers select c).ApplySecurity(); </code></pre> <p>so if you modify ApplySecurity it will automatically be applied to all linq queries on Customer object.</p>
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    1. POHow to intercept and modify SQL query in Linq to SQL
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    1. COIs there anyway to force linq to apply the "applysecurity" where extension to all queries prior to executing them automatically - so from the developer's perspective they'd write: var cs = (from c in db.Customers select c); but before the query hits the db, it applies the security where clause?
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    2. CONot to my knowledge, the tree building code is generated at compile time.
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