How to retain the values of dynamically added row to gridview after postback ?

Viewstate not storing the last row of values from the gridview .

This is the code for Save button
Protected Sub btnSave_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnSave.Click
'Please do not double click this button to view code.
'If you double click it will generate Handles event due to which the
'values will be inserted twice into the database
Try

'SetRowData()
Dim table As DataTable = TryCast(ViewState("CurrentTable"), DataTable)

If table IsNot Nothing Then
For Each row As DataRow In table.Rows
Dim funob As String = TryCast(row.ItemArray(1), String)
Dim measur As String = TryCast(row.ItemArray(2), String)
Dim d_line As String = TryCast(row.ItemArray(3), String)
Dim wtfact As String = TryCast(row.ItemArray(4), String)


'If funob IsNot Nothing OrElse measur IsNot Nothing OrElse d_line IsNot Nothing OrElse wtfact IsNot Nothing Then
If funob IsNot Nothing Or measur IsNot Nothing Or d_line IsNot Nothing Or wtfact IsNot Nothing Then

Dim cmd As New SqlCommand
Dim obj As New GenericCode
Dim str As String
Dim con As New SqlConnection
Dim empcode As String = Session("emp_code")
con.ConnectionString = strConnString
con.Open()
str = " insert into MBO_Details(MBO_EMP_Code,MBO_FUNC_OBJ,MBO_MEASURED_VAR,MBO_DEADLINE,MBO_WEIGHT_FACT) values ('" & empcode & "','"
str = str & funob & "','" & measur & "','" & d_line & "','" & wtfact & "')"

cmd.CommandText = str
cmd = New SqlCommand(str, con)
cmd.ExecuteNonQuery()
con.Close()


End If
Next
lblusrmsg.Visible = True
btnSave.Enabled = False
ButtonAdd.Enabled = False

End If
Catch ex As Exception
Throw New Exception(ex.Message)
End Try
End Sub