Änderungen Invoices.aspx und Web.config

Customers/Invoices.aspx

@@ -184,7 +184,8 @@
                                     </div>
                                 </div>
                                            <div id="Abstand_laenger" style="height: /*24px*/ 1.873536299765808vh;"></div> 
-                                <asp:Button ID="btn_Send_Data" class="btn btn-primary" OnClick="btn_Send_Data_Click" runat="server" Text="Erhalte Rechnungen" CausesValidation="false"  style="font-size:1.33em;width:260px;height:30px;color:#fff" />
+                                <asp:Button ID="btn_Send_Data" class="btn btn-primary" runat="server" Text="Erhalte Rechnungen" OnClick="btn_Send_Data_Click" CausesValidation="false"  style="font-size:1.33em;width:260px;height:30px;color:#fff" />
+                                
                                       <div id="Abstand_lang" style="height: /*32px*/ 2.498048399687744vh;"></div> 
                                 <div class="g-3">
                                     <div id="conovertab" style="overflow-x:auto;margin-left:-2px">

Customers/Invoices.aspx.vb

@@ -164,6 +164,7 @@ Partial Class Customers_Invoices
 
     Protected Sub btn_Send_Data_Click(sender As Object, e As EventArgs)
         dt = Nothing
+
         valreq_pickdate1.Validate()
         valreq_pickdate2.Validate()
         If valreq_pickdate1.IsValid And valreq_pickdate2.IsValid And Kdnrtext = Not "" Then
@@ -240,7 +241,6 @@ Partial Class Customers_Invoices
                     lbl_status.Text = ex.Message
                 End Try
             End If
-
             If Not String.IsNullOrEmpty(txt_Absender_M.Text) Then
                 txt_Absender_M.ValidateRequestMode = UI.ValidateRequestMode.Enabled
                 Try
@@ -273,7 +273,6 @@ Partial Class Customers_Invoices
                     lbl_status.Text = ex.Message
                 End Try
             End If
-
             If Not String.IsNullOrEmpty(txt_ReNr_M.Text) Then
                 txt_ReNr_M.ValidateRequestMode = UI.ValidateRequestMode.Enabled
                 Try
@@ -382,4 +381,5 @@ Partial Class Customers_Invoices
         End If
         'End If
     End Sub
+
 End Class

Web.config

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" ?>
 <!--
   Weitere Informationen zum Konfigurieren der ASP.NET-Anwendung finden Sie unter
   http://go.microsoft.com/fwlink/?LinkId=169433
@@ -122,7 +122,7 @@
   <appSettings>
     <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
     <add key="ClientValidationEnabled" value="true" />
-    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
+    <add key="UnobtrusiveJavaScriptEnabled" value="false" />
   </appSettings>
   <location path="Customers">
     <system.web>