DataGrid Navigation Bar disappeated!

[Raed Sawalha]

Hello:

I have windows application that do monitoring task, there is a thread
continously running to check updates made on XML file then updates the
datagrid information with new information as follows :

DataSet dsUsers = new DataSet("dsUsers");
dsUsers.ReadXml(EduFilterMonitorFile);
if(dsUsers.Tables.Count == 2)
sbUsers.Text = "No Information avaiable - No Users in EduFilter Cache
System";
else
{
dgUsers.DataSource = dsUsers.Tables[2];
sbUsers.Text = "Done - Last Updated Since " + DateTime.Now.ToString();

}

the problem when update occured the Navigation bar of datagrid is
disappeared,Why? How can I maintain the state of datagrid after updates its
datasource