Foros del Web - duda en asp.net con dreamweaver

<%@ Page Language="VB" ContentType="text/html" ResponseEncoding="utf-8" %>
<%@ Register TagPrefix="MM" Namespace="DreamweaverCtrls" Assembly="DreamweaverCtrls,version=1.0.0.0,publicK eyToken=836f606ede05d46a,culture=neutral" %>
<MM:Insert
runat="server"
CommandText='<%# "INSERT INTO dbo.fecha (fecha) VALUES (@fecha)" %>'
ConnectionString='<%# System.Configuration.ConfigurationSettings.AppSett ings("MM_CONNECTION_STRING_cn1") %>'
DatabaseType='<%# System.Configuration.ConfigurationSettings.AppSett ings("MM_CONNECTION_DATABASETYPE_cn1") %>'
Expression='<%# Request.Form("MM_insert") = "Prueba" %>'
CreateDataSet="false"
Debug="true"
>
<Parameters>
<Parameter Name="@fecha" Value='<%# IIf((Request.Form("txtFecha") <> Nothing), Request.Form("txtFecha"), "") %>' Type="DateTime" />
</Parameters>
</MM:Insert>
<MM:PageBind runat="server" PostBackBind="true" />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script language="vb" runat="server">
Sub Page_Load(sender as Object, e as EventArgs)
If Not IsPostBack
RellenarDDLYears()
ddlYear.SelectedValue = Date.Now.Year

RellenarDDLMonths()
ddlMonth.SelectedIndex = Date.Now.Month - 1

RellenarDDLDays(ddlMonth.SelectedIndex + 1)
ddlDay.SelectedValue = Date.Now.Day
End If

txtFecha.Text = ddlDay.SelectedValue &"/"& ddlMonth.SelectedValue &"/"& ddlYear.SelectedValue
End Sub

Sub Cambia_Mes(sender as Object, e As EventArgs)
Session("ssDaySelected") = ddlDay.SelectedIndex
RellenarDDLDays(sender.SelectedIndex + 1)
End Sub

Sub RellenarDDLDays(ipMes As Integer)
ddlDay.Items.Clear()
Dim endDayNumber, i As Integer
If ipMes.Equals(1) Or ipMes.Equals(3) Or ipMes.Equals(5) Or ipMes.Equals(7) Or ipMes.Equals(8) Or ipMes.Equals(10) Or ipMes.Equals(12)
endDayNumber = 31
Else If ipMes.Equals(4) Or ipMes.Equals(6) Or ipMes.Equals(9) Or ipMes.Equals(11)
endDayNumber = 30
Else
endDayNumber = 28
End If
For i = 1 To endDayNumber
ddlDay.Items.Add(i)
ddlDay.DataValueField = i
ddlDay.DataTextField = i
Next

If Not Session("ssDaySelected") Is Nothing Then
ddlDay.SelectedIndex = Convert.toInt32(Session("ssDaySelected"))
Session.Clear()
End If
End Sub

Sub RellenarDDLYears()
ddlYear.Items.Clear()
Dim i As Integer
For i = 1990 To 2100
ddlYear.Items.Add(i)
Next
End Sub

Sub RellenarDDLMonths()
ddlMonth.Items.Clear()
Dim Meses As String() = {"Enero","Febrero","Marzo","Abril","Mayo","Junio", "Julio","Agosto","Septiembre","Octubre","Noviembre ","Diciembre"}
Dim i As Integer
For i = 0 To Meses.Length()-1
ddlMonth.Items.Add(Meses(i))
ddlMonth.DataValueField = i
ddlMonth.DataTextField = Meses(i)
Next
End Sub
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Documento sin título</title>
<style type="text/css">

</style>
</head>
<body>
<form method='POST' name='Prueba' id="Prueba" runat='server'>
<table width="200" border="0" cellspacing="5">
<tr>
<td class="Headers">Dia</td>
<td class="Headers">Mes</td>
<td class="Headers">Año</td>
</tr>
<tr>
<td><asp:DropDownList ID="ddlDay" runat="server" CssClass="DDLs"></asp:DropDownList></td>
<td><asp:DropDownList ID="ddlMonth" runat="server" CssClass="DDLs" OnSelectedIndexChanged="Cambia_Mes"></asp:DropDownList></td>
<td><asp:DropDownList ID="ddlYear" runat="server" CssClass="DDLs"></asp:DropDownList></td>
</tr>

<tr>
<td colspan="3" align="center">
<asp:Label ID="lblFecha" Text="Fecha (Concatenación)" runat="server" CssClass="Headers" />
<br />
<asp:TextBox ID="txtFecha" runat="server" ReadOnly="true" CssClass="DDLs" Width="120" AutoPostBack="true"/>
<asp:Button ID="Button1" runat="server" /> </td>
</tr>
</table>
<input type="hidden" name="MM_insert" value="Prueba">
</form>
</body>
</html>

kiero q me ayuden con 1 problema al insertar a mi tabla fecha...el unico campo es fecha....el problema es q al parecer se .....kiero insertar el archivo concatenado..... al parecer inserta 2 veces archivos...y la nueva fecha

espero q me ayuden