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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.xml.serialization.xmlrootattribute below:

XmlRootAttribute Class (System.Xml.Serialization) | Microsoft Learn

Controls XML serialization of the attribute target as an XML root element.

public ref class XmlRootAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Enum | System.AttributeTargets.Interface | System.AttributeTargets.ReturnValue | System.AttributeTargets.Struct)]
public class XmlRootAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Enum | System.AttributeTargets.Interface | System.AttributeTargets.ReturnValue | System.AttributeTargets.Struct)>]
type XmlRootAttribute = class
    inherit Attribute

Public Class XmlRootAttribute
Inherits Attribute

Inheritance

Attributes

The following example applies the XmlRootAttribute to a class. The attribute specifies the element name, namespace, and whether the element is qualified, and whether the xsi:nil attribute is generated if the class is set to null.

using System;
using System.IO;
using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;

[XmlRoot(Namespace = "www.contoso.com",
     ElementName = "MyGroupName",
     DataType = "string",
     IsNullable=true)]
public class Group
{
    private string groupNameValue;
    // Insert code for the Group class.
    public Group()
    {
    }

    public Group(string groupNameVal)
    {
        groupNameValue = groupNameVal;
    }

    public string GroupName
    {
        get{return groupNameValue;}
        set{groupNameValue = value;}
    }
}
public class Test
{
    static void Main()
    {
        Test t = new Test();
        t.SerializeGroup();
    }

    private void SerializeGroup()
    {
        // Create an instance of the Group class, and an
        // instance of the XmlSerializer to serialize it.
        Group myGroup = new Group("Redmond");
        XmlSerializer ser = new XmlSerializer(typeof(Group));
        // A FileStream is used to write the file.
        FileStream fs = new FileStream("group.xml",FileMode.Create);
        ser.Serialize(fs,myGroup);
        fs.Close();
        Console.WriteLine(myGroup.GroupName);
        Console.WriteLine("Done");
        Console.ReadLine();
    }
}

Imports System.IO
Imports System.Xml
Imports System.Xml.Schema
Imports System.Xml.Serialization

<XmlRoot(Namespace:="www.contoso.com", _
    ElementName:="MyGroupName", _
    DataType:="string", _
    IsNullable:=True)> _
Public Class Group

    Private groupNameValue As String
    ' Insert code for the Group class.
    Public Sub New()

    End Sub

    Public Sub New(ByVal groupNameVal As String)

        groupNameValue = groupNameVal
    End Sub

    Property GroupName() As String
        Get
            Return groupNameValue
        End Get

        Set(ByVal Value As String)
            groupNameValue = Value
        End Set
    End Property
End Class

Public Class Test

    Shared Sub Main()

        Dim t As Test = New Test()
        t.SerializeGroup()
    End Sub

    Private Sub SerializeGroup()

        ' Create an instance of the Group class, and an
        ' instance of the XmlSerializer to serialize it.
        Dim myGroup As Group = New Group("Redmond")
        Dim ser As XmlSerializer = New XmlSerializer(GetType(Group))

        ' A FileStream is used to write the file.
        Dim fs As FileStream = New FileStream("group.xml", FileMode.Create)
        ser.Serialize(fs, myGroup)
        fs.Close()
        Console.WriteLine(myGroup.GroupName)
        Console.WriteLine("Done... Press any key to exit.")
        Console.ReadLine()
    End Sub

End Class

The XmlRootAttribute belongs to a family of attributes that controls how the XmlSerializer serializes or deserializes an object. For a complete list of similar attributes, see Attributes That Control XML Serialization.

You can apply the XmlRootAttribute to a class, structure, enumeration, or interface. You can also apply the attribute to the return value of an XML Web service method.

Every XML document must have a single root element that contains all the other elements. The XmlRootAttribute allows you to control how the XmlSerializer generates the root element by setting certain properties. For example, specify the name of the generated XML element by setting the ElementName property.

For more information about using attributes, see Attributes.

Note

You can use the word XmlRoot in your code instead of the longer XmlRootAttribute.

Maps a set of names to a corresponding set of dispatch identifiers.

Retrieves the type information for an object, which can be used to get the type information for an interface.

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

Provides access to properties and methods exposed by an object.

• XmlArrayAttribute
• XmlElementAttribute
• XmlSerializer
• XmlAttributes
• Introducing XML Serialization
• How to: Specify an Alternate Element Name for an XML Stream
• Controlling XML Serialization Using Attributes
• Examples of XML Serialization
• XML Schema Definition Tool (Xsd.exe)

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