This might be a simple question....

I have a simple xml file:
<?xml version="1.0" encoding="UTF-8"?>
<Content>
<Element1>ele2</Element1>
<Element2>ele2</Element2>
</Content>

I want to replace Content with Page and I tried:
XmlNode firstNode = xmlDoc.SelectSingleNode("Content");
firstNode.LocalName.Replace("Content","Page");

Obviously I am doing it wrong or not understanding it properly, so, I am not getting the desired output. What is the correct api that I should use?

I am using C# for my code.