'Usage

Dim instance As UserGroup
Dim groupName As String
Dim returnValue As XmlNode

returnValue = instance.GetUserCollectionFromGroup(groupName)

'Declaration

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

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

Dim ndUsers As XmlNode = usrgrpService.GetUserCollectionFromGroup("Group_Name")

MessageBox.Show(ndUsers.OuterXml)