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    <p>Just use the normal Boolean operators &amp;&amp; and ||:</p> <pre><code>XDocument db = XDocument.Load(xmlPath); var query = (from vals in db.Descendants("Customer") where (textbox1.Text != "" &amp;&amp; vals.Element("CustomerID") == Convert.ToInt32(textbox1.Text)) || (textbox2.Text != "" &amp;&amp; vals.Element("Name") == textbox2.Text) select vals).ToList(); </code></pre> <p>That's just a direct translation of the original code - but I think you'll want a cast from <code>vals.Element("CustomerID")</code> to <code>int</code>, and you don't really want to convert <code>textbox1.Text</code> on every iteration, I'm sure. You also need to convert the "name" <code>XElement</code> to a string. How about this:</p> <pre><code>int? customerId = null; if (textbox1.Text != "") { customerId = int.Parse(textbox1.Text); } XDocument db = XDocument.Load(xmlPath); var query = (from vals in db.Descendants("Customer") where (customerId != null &amp;&amp; (int) vals.Element("CustomerID") == customerId) || (textbox2.Text != "" &amp;&amp; (string) vals.Element("Name") == textbox2.Text) select vals).ToList(); </code></pre> <p>Alternatively, you could separate out the two parts of the query and "union" the results together. Or - preferably IMO - you could build the query more dynamically:</p> <pre><code>var query = db.Descendants("Customer"); if (textbox1.Text != null) { int customerId = int.Parse(textbox1.Text); query = query.Where(x =&gt; (int) x.Element("CustomerID") == customerId); } if (textbox2.Text != null) { query = query.Where(x =&gt; (string) x.Element("Name") == textbox2.Text); } List&lt;XElement&gt; results = query.ToList(); </code></pre>
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    1. USJon Skeet
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    1. COFantastic again Jon. I've already cased out to values as you mentioned in the second option, just was using the code above to make things more simple. Thank you very much again!
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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