ASP.NET

@model FirstTab
<!-- Tab Buttons -->
<ul id="tabstrip" class="nav nav-tabs" role="tablist">
    <li class="active">
        <a href="#FirstTab" role="tab" data-toggle="tab">Submission</a>
    </li>
    <li>
        <a href="#SecondTab" role="tab" data-toggle="tab">Search</a>
    </li>
</ul>

<!-- Tab Content Containers -->
<div class="tab-content">
    <div class="tab-pane active" id="FirstTab">
       
    </div>
    <div class="tab-pane fade" id="SecondTab">

    </div>
</div>
<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script>
    $('#tabstrip a').click(function (e) {
        e.preventDefault();
        var tabID = $(this).attr("href").substr(1);
        $(".tab-pane").each(function () {
            console.log("clearing " + $(this).attr("id") + " tab");
            $(this).empty();
        });

        $.ajax({
            url: "/@ViewContext.RouteData.Values["controller"]/" + tabID,
            cache: false,
            type: "get",
            dataType: "html",
            success: function (result) {
                $("#" + tabID).html(result);
            }

        });
        $(this).tab('show');
    });

    $(document).ready(function () {
        $('#tabstrip a')[0].click();
    });
</script>

@model WebApplication1.Models.FirstTab

<h4>FirstTab</h4>
<hr />
<div class="row">
    <div class="col-md-4">
       <form asp-action="FirstTabCreate">        
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="FirstName" class="control-label"></label>
                <input asp-for="FirstName" class="form-control" />
                <span asp-validation-for="FirstName" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Create" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-action="Index">Back to List</a>
</div>

using System.ComponentModel.DataAnnotations;

namespace WebApplication1.Models
{
    public class FirstTab
    {
        [Required()]
        public string FirstName { get; set; }
    }
}

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using System.Diagnostics;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class HomeController : Controller
    {       
        public IActionResult Index()
        {
            return View();
        }

        public ActionResult FirstTab()
        {
            return PartialView("FirstTabCreate");
        }

        public ActionResult FirstTabCreate(FirstTab model)
        {
            if (!ModelState.IsValid)
            {
                return View("FirstTabCreate",  model);
            }
            return Content("Success");
        }

        public ActionResult SecondTab()
        {
            return PartialView("_SecondTab");
        }
    }
}

public class MyCacheProvider : OutputCacheProvider
{
  public override object Add(string key, object entry, DateTime utcExpiry)
  {
    return entry;
  }

  public override object Get(string key)
  {
    return null;
  }

  public override void Remove(string key)
  {
  }

  public override void Set(string key, object entry, DateTime utcExpiry)
  {
  }
}

To send emails from an (old) asp.net website I use the following code :    
-------

    Protected Sub SendMail(sender As Object, e As System.EventArgs)
        Try
            Dim smtpSection As SmtpSection = CType(ConfigurationManager.GetSection("system.net/mailSettings/smtp"), SmtpSection)
            
            Dim smtp As New SmtpClient
            smtp.Host = smtpSection.Network.Host
            smtp.EnableSsl = smtpSection.Network.EnableSsl
            smtp.UseDefaultCredentials = smtpSection.Network.DefaultCredentials
            smtp.Port = smtpSection.Network.Port
  
            'solution 1 does not work !
            'Dim networkCred As NetworkCredential = New Net.NetworkCredential(smtpSection.Network.UserName, smtpSection.Network.Password)
            'smtp.Credentials = networkCred
            
            'solution 2 does not work !
            'Dim networkCred As New Net.NetworkCredential(smtpSection.Network.UserName, smtpSection.Network.Password)
            'smtp.Credentials = networkCred
            
            'solution 3 does work !!!
            smtp.Credentials = New Net.NetworkCredential("yyyyyy@xxxxxx.com", "zzzzzz")
            
            Using mm As New MailMessage(smtpSection.From, txtTo.Text.Trim())
                mm.Subject = txtSubject.Text.Trim()
                mm.Body = txtBody.Text.Trim()
                mm.IsBodyHtml = False
                
                TextBox2.Text = smtpSection.Network.UserName
                TextBox3.Text = smtpSection.Network.Password
                TextBox4.Text = smtpSection.Network.Host
                TextBox5.Text = smtpSection.Network.Port
                TextBox6.Text = smtpSection.Network.EnableSsl
                TextBox7.Text = smtpSection.Network.DefaultCredentials
                TextBox8.Text = smtpSection.From
                TextBox9.Text = txtTo.Text.Trim()
                
                smtp.Send(mm)

            End Using
            
        Catch error_t As Exception
            TextBox1.Text = error_t.ToString
        End Try
        
    End Sub
-------

The web.config section contains this : 
-------

      <smtp deliveryMethod="Network" from="yyyyyy@xxxxxx.com" >
        <network
            host="smtp-auth.mailprotect.be"
            port="2525"
            userName="yyyyyyyy@xxxxxxxx.com "
            password="zzzzzz"
            defaultCredentials="false"
            enableSsl="false"
        />
      </smtp>
------

The namespaces loaded are : 

    <%@ Import Namespace="System.Net" %>
    <%@ Import Namespace="System.Net.Mail" %>
    <%@ Import Namespace="System.Configuration" %>
    <%@ Import Namespace="System.Net.Configuration" %>

Solution 3 works fine but I don't like to show passwords in a page.

When using solution 1 or 2 the mailserver replies it does not relay, so apparently the credentials are not retrieved work properly.
All the other parameters do show properly in the textboxes I designed to test this sub.

Does anyone have a suggestion ?

Thanks.

Store Dataset into session variable 

this.Response.Headers.Remove("Server");
 Response.AddHeader("Server", "My httpd server");