Web Forms :: Name Txtcscs Not Declared

I get the above error while compiling and the name is in my .aspx file while i try to assign it in my .vb file like this
IN .aspx file:

<tr>
<td class="txtarialsml">SEC Fee</td>
<td> <asp:TextBox runat="server" ID="txtsec" Width="150px" BorderColor="Silver" BorderStyle="Solid" BorderWidth="1px" ReadOnly="true" CssClass="txtverdlink" Height="18px"></asp:TextBox></td>
</tr>
<tr>
<td class="txtarialsml">CSCS Fee</td>
<td> <asp:TextBox runat="server" ID="txtcscs" Width="150px" BorderColor="Silver" BorderStyle="Solid" BorderWidth="1px" ReadOnly="true" CssClass="txtverdlink" Height="18px"></asp:TextBox></td>
</tr>
<tr>
<td class="txtarialsml">NSE Fee</td>
<td> <asp:TextBox runat="server" ID="txtnse" Width="150px" BorderColor="Silver" BorderStyle="Solid" BorderWidth="1px" ReadOnly="true" CssClass="txtverdlink" Height="18px"></asp:TextBox></td>
</tr>
In .VB file
Protected Sub drpstock_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles drpstock.SelectedIndexChanged
Try
txtsec.Text = ""
txtnse.Text() = ""
txtcscs.Text() = ""
Catch ex As Exception
Session("errorcode") = "blabla"
Session("errordesc") = "This exception occurred while trying to fetch data."
Response.Redirect("../errorpage.aspx")
End Try
End Sub
Public Sub dg_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs)
Dim row As DataGridItem = e.Item
lblData.Text = "in subprocedure"
If row.ItemType = ListItemType.Item OrElse row.ItemType = ListItemType.AlternatingItem Then
Dim day As DateTime = Convert.ToDateTime(DirectCast(row.DataItem, DataRowView)("day").ToString())
Dim tempMonth As Integer = day.Month
Dim lblMonth As Label = DirectCast(row.Cells(0).FindControl("lblMonth"), Label)
If row.ItemIndex = 0 Then
UpdateLabel(lblMonth, day)
End If
If currMonth <> tempMonth Then
'add blank row
currMonth = tempMonth
j += 1
AddRow(row.ItemIndex + j)
UpdateLabel(lblMonth, day)
End If
End If
End Sub