Locking XML file

[Sonal]

Hi!!

I have a web service that writes a node in xml file and saves it and
closes it. Now it is a possiblitity that several users try to edit the
same file at the same time. Is it possible to lock this xml file till
the first user closes it and then release it for the next user.

My function that writes xml file is as follows:

Public Function AddNodetoAreaXML(ByVal TeamId As String, ByVal
TeamName As String) As Boolean
Dim xDoc As New XmlDocument
Dim DocName As String =
ConfigurationSettings.AppSettings("TeamXml")
Try

xDoc.Load(DocName)
Dim NodeAreas As XmlNode = xDoc.DocumentElement
Dim ElemArea As XmlElement =
xDoc.CreateElement("Area")

Dim ElemAreaID As XmlElement =
xDoc.CreateElement("AreaId")
ElemAreaID.InnerText = TeamId
Dim ElemAreaName As XmlElement =
xDoc.CreateElement("AreaName")
ElemAreaName.InnerText = TeamName

NodeAreas.AppendChild(ElemArea)
ElemArea.AppendChild(ElemAreaID)
ElemArea.AppendChild(ElemAreaName)

xDoc.Save(DocName)
Catch ex As FileNotFoundException
Throw ex
Catch ex As Exception
Throw ex
End Try

Return True
End Function

I would really appreciate response to solve this problem.

Regards,
Sonal