Serialization of List not giving required output

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C#

VB

XML

C#4.0

serialization

I have a tried list, array and all different types

I have a list of items which is serializing just fine

in c#

public List<Item> TransactionLines = new List<ItemSerial>();

in vb.net

Public WithEvents TransactionLines As New List(Of Item)

xml output is

<TransactionLines>
       <Item>
        <elements>
       </item>
       <Item>
        <elements>
       </item>
    </TransactionLines>

my serilization method is the following

In C#

public string SerializeToXML<T>(T obj)
{
    string XMLString = "";
    
        XmlSerializer mySerializer = new XmlSerializer(obj.GetType());

        using (MemoryStream myMemStream = new MemoryStream()) {
            mySerializer.Serialize(myMemStream, obj);
            myMemStream.SeekToBegin();
            XMLString = myMemStream.ReadToEnd(Encoding.UTF8);
    return XMLString;
}

In vb.net

Public Function SerializeToXML(Of T)(ByVal obj As T) As String

            Dim XMLString As String = ""
            
                Dim mySerializer As XmlSerializer = New XmlSerializer(obj.GetType)

                Using myMemStream As MemoryStream = New MemoryStream()
                    mySerializer.Serialize(myMemStream, obj)
                    myMemStream.SeekToBegin()
                    XMLString = myMemStream.ReadToEnd(Encoding.UTF8)
                End Using
             Return XMLString
End Function

List to be serialized

c#

[XmlElement(Order = 17)]
public List<ItemSerial> Serials = new List<ItemSerial>();

vb.net

<XmlElement(Order:=17)>
    Public Serials As New List(Of ItemSerial)

This is my xml output

<Serials>
       <Serial>A</Serial>
       <ExpiryDate>0001-01-01T00:00:00</ExpiryDate>
       <Qty>1</Qty>
    </Serials>
    <Serials>
       <Serial>B</Serial>
       <ExpiryDate>0001-01-01T00:00:00</ExpiryDate>
       <Qty>1</Qty>
    </Serials>

The following output is required.

<Serials>
       <ItemSerial>
          <Serial>A</Serial>
          <ExpiryDate>0001-01-01T00:00:00</ExpiryDate>
          <Qty>1</Qty>
       </ItemSerial>
       <ItemSerial>
          <Serial>B</Serial>
          <ExpiryDate>0001-01-01T00:00:00</ExpiryDate>
          <Qty>1</Qty>
       </ItemSerial>
    </Serials>

Please explain what I did wrong so far and what is to be done.