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    <p>Your XPATH value is incorrect. </p> <pre><code>XmlNode myNode = root.SelectSingleNode("/connectionString"); </code></pre> <p>In the line above <code>myNode</code> is null because method <code>SelectSingleNode</code> <strong>returns</strong> The first XmlNode that matches the XPath query or <strong>null if no matching node is found</strong> and there is no node that contains that XPATH. Looks like a typo where you left off the "s" in ConnectionStrings (or think that you can use an attribute name like an element [node] name</p> <p>In your second example the XPATH needs to resolve to</p> <pre><code>"/ConnectionStrings/add[@connectionString='asdf']" </code></pre> <p>Again, it looks like you have a typo where you are using quotes(") instead of ticks(') in your expression.</p> <p>If you are looking for the attributes of the add <code>element</code> then your XPATH expression would be <code>/ConnectionStrings/add</code> and then you can get the attributes of that node. This assumes that you have given us the XML from the root node. You may want to look at this <a href="http://www.w3schools.com/xpath/xpath_syntax.asp" rel="nofollow">tutorial</a></p> <p>You have another typo once you get past the null issue of the <code>XmlNode</code>.</p> <pre><code>node.Attributes["ConnectionStrings"].Value = sql_Connection; </code></pre> <p>in the XML example above the attribute name is <code>connectionString</code> not <code>ConnectionStrings</code> so you will need to change the above line to.</p> <pre><code>node.Attributes["connectionString"].Value = sql_Connection; </code></pre>
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    1. POWriting to an XML file using standard microsoft libraries
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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.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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