Save & Retrieve data into XML file using vb.net

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VB

Hello friends I trying to save and retrieve data in xml file using vb.net first of all I add a xml file (emp.xml) from add new item -> add some dummy data into it like

<serverinfo>
  <servername>abc</servername>
  <serverpwd>123</serverpwd>
</serverinfo>

copy the file from application folder to debug folder and write the following code on for save data :-

Dim path As String = Application.StartupPath & "\emp.xml"
   Dim dt As New DataTable("emp")
   Dim ds As New DataSet()
   ds.ReadXml(path)
   dt.Columns.Add(New DataColumn("eid", Type.[GetType]("System.Int32")))
   dt.Columns.Add(New DataColumn("ename"))
   Dim r As DataRow = ds.Tables(0).NewRow()
   r(0) = TextBox1.Text
   r(1) = TextBox2.Text
   ds.Tables(0).Rows.Add(r)
   ds.WriteXml(path)

and for display data into datagridview named (dg_Data)

Dim path As String = Application.StartupPath & "\emp.xml"
Dim ds As New DataSet()
ds.ReadXml(path)
dg_Data.DataSource = ds.Tables(0)

But it give some error when it read the xml file the error is "Root element is missing" so please help me..

Thanks in advance
Parveen Rathi