Gridview Not showing Data on page change, when pagechangeindex is alrady handaled

[kamalpsc]

hi,
I have a gridview which is showing 10 record per page. I have manually set the Datasource. I have also set the gridView_PageIn dexChanging. when running it shows data in first page with all other page numbers. But, when click on 2nd or 3rd page no. it do not shows any data. I have 100 record in table. i want to show 10 records each page, how to solve this problem? please help me.

   Function fillgvnhpclist()

        Dim qrystring As String

        qrystring = "select * from sahaj_driver_ order by emp_code,year_mon"
        objcommand = New OdbcCommand(qrystring, objconn)
        objda = New OdbcDataAdapter(objcommand)
        objda.Fill(objdt)
        If objdt.Rows.Count > 0 Then
            GVnhpc1.DataSource = objdt
            GVnhpc1.DataBind()
        End If
        Return 1
    End Function

   
    Protected Sub gridView_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles GVnhpc1.PageIndexChanging
        GVnhpc1.PageIndex = e.NewPageIndex
        GVnhpc1.DataSource = objdt
        GVnhpc1.DataBind()
    End Sub

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        DatabaseConnection()
        Try
            objconn.Open()
           If (Page.IsPostBack) <> True Then
                fillgvnhpclist()
            End If
        Catch ex As Exception
            If objconn.State = ConnectionState.Open Then
                objconn.Close()
            End If
        End Try
    End Sub