'Usage

Dim instance As UserGroup
Dim userLoginName As String
Dim returnValue As XmlNode

returnValue = instance.GetGroupCollectionFromUser(userLoginName)

'Declaration

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

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

Dim ndGroups As System.Xml.XmlNode = usrgrpService.GetGroupCollectionFromUser("DOMAIN\User_Alias")

MessageBox.Show(ndGroups.OuterXml)