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    <p>If what you're trying to do is update attributes of XML this could be one way:</p> <pre><code>XElement elem = XElement.Load("xmlFilePath"); System.Xml.XPath.Extensions.XPathSelectElement(elem, "xpath").SetAttributeValue("attributeName", "newValue"); </code></pre> <p>where xmlFilePath is the path to the XML you're changing, xpath is the path to the element of the xml and attributeName is the name of the nodes attribute you're altering... Ofcourse, you have to add a custom node with attribute to every xml you're using.</p> <p><strong>EDIT:</strong> Since you said you can't modify the XML files in both locations, than all you're left with is to compare the <code>FileInfo</code> properties of the files themselves. </p> <p>And if the <code>FileInfo</code> properties are not what you need, then there's no other solution but to create a tracking db or a file, which will contain attribute values for your Original and Target directory, by which you can compare and do appropriate action. </p> <p>For example, if your Original and Target maps 1 on 1, than you could have a simple table structure like this 'TableName, OriginalValue, TargetValue'. Where you'd keep this 'tracking' data (db, xml file, other...) depends on the number of entries, and your current architecture...</p> <p><strong>EDIT2:</strong> If you wan't to append to the first attribute found you can use this:</p> <pre><code> XElement elem = XElement.Load("myfilepath.xml"); elem.FirstAttribute.SetValue(elem.FirstAttribute.Value + "|myothervalue"); </code></pre>
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    1. POideas to modify attributes of different XML files c#
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    1. COI can't add a custom node that's the problem. The XMLs are generated from DB Coloumns representing their attributes. And I can't modify the DB. What I need is a way to modify the XML Files knowing that not all XML Files have a common Attribute.
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    2. COYou can add attribute at root element because the root always exists and it's not related to tables (if that's not the case, please post a simple xml example of your file). If the attribute doesn't exist the SetAttributeValue will create it for you - just make sure it's some unique name just in case.
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    3. COI used the "SetAttributeValue" and added a new attribute named "Sabassi" but it still gave me the NullReferenceException.. :S
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