<SoapDocumentMethodAttribute("http://schemas.microsoft.com/sharepoint/soap/directory/GetGroupCollectionFromSite", RequestNamespace:="http://schemas.microsoft.com/sharepoint/soap/directory/", ResponseNamespace:="http://schemas.microsoft.com/sharepoint/soap/directory/", Use:=SoapBindingUse.Literal, ParameterStyle:=SoapParameterStyle.Wrapped)> _
Public Function GetGroupCollectionFromSite As XmlNode

Dim instance As UserGroup
Dim returnValue As XmlNode

returnValue = instance.GetGroupCollectionFromSite

[SoapDocumentMethodAttribute("http://schemas.microsoft.com/sharepoint/soap/directory/GetGroupCollectionFromSite", RequestNamespace="http://schemas.microsoft.com/sharepoint/soap/directory/", ResponseNamespace="http://schemas.microsoft.com/sharepoint/soap/directory/", Use=SoapBindingUse.Literal, ParameterStyle=SoapParameterStyle.Wrapped)] 
public XmlNode GetGroupCollectionFromSite ()

<GetGroupCollectionFromSite xmlns=
   "http://schemas.microsoft.com/sharepoint/soap/directory/">
   <Groups>
      <Group ID="3" Name="Group1" Description="Description" OwnerID="1" 
         OwnerIsUser="False" />
      <Group ID="15" Name="Group2" Description="Description" 
         OwnerID="12" OwnerIsUser="True" />
      <Group ID="16" Name="Group3" Description="Description" 
         OwnerID="7" OwnerIsUser="False" />
   </Groups>
</GetGroupCollectionFromSite>

Dim usrgrpService As New Web_Reference_Folder_Name.UserGroup()
usrgrpService.Credentials = System.Net.CredentialCache.DefaultCredentials

Dim ndGroups As System.Xml.XmlNode = usrgrpService.GetGroupCollectionFromSite()

MessageBox.Show(ndGroups.OuterXml)

Web_Reference_Folder_Name.UserGroup usrgrpService = new Web_Reference_Folder_Name.UserGroup();
usrgrpService.Credentials= System.Net.CredentialCache.DefaultCredentials;

System.Xml.XmlNode ndGroups = usrgrpService.GetGroupCollectionFromSite();

MessageBox.Show(ndGroups.OuterXml);