SetValue Method

XPathNavigator.SetValue Method (String)


Sets the value of the current node.

Namespace:   System.Xml.XPath
Assembly:  System.Xml (in System.Xml.dll)

public virtual void SetValue(
	string value


Type: System.String

The new value of the node.

Exception Condition

The value parameter is null.


The XPathNavigator is positioned on the root node, a namespace node, or the specified value is invalid.


The XPathNavigator does not support editing.

  • If the XPathNavigator is positioned on an element node with complex content (child elements), calling the SetValue method replaces the child elements with a text node containing the new string value.

  • The SetValue method cannot update the root node or namespace nodes.

In the following example, the SetValue method is used to update all price elements in the contosoBooks.xml file using the XmlNamespaceManager object to resolve namespace prefixes in the XPath expression.

XmlDocument document = new XmlDocument();
XPathNavigator navigator = document.CreateNavigator();

XmlNamespaceManager manager = new XmlNamespaceManager(navigator.NameTable);
manager.AddNamespace("bk", "");

foreach (XPathNavigator nav in navigator.Select("//bk:price", manager))
    if (nav.Value == "11.99")


The example takes the contosoBooks.xml file as an input.

<?xml version="1.0" encoding="utf-8" ?>
<bookstore xmlns="">
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">
        <title>The Autobiography of Benjamin Franklin</title>
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">
        <title>The Confidence Man</title>
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">
        <title>The Gorgias</title>

Universal Windows Platform
Available since 10
.NET Framework
Available since 2.0
Available since 4.0
Return to top
© 2016 Microsoft