Event Receiver not working into SharePoint List all times

Question

i'm working on a sharepoint server 2013 and using VS2013.

My task is to create an Event Receivers on a custom list, i used the event ItemAdded on it.

Every thing is working well: 
Go to list >> create a new item >> the event receiver was fired up directly.

Then i create a custom form (using webpart) for my list, but the event Receiver didn't fired up! ( This WebPart is a custom form that contains the same fields as the list and when i submit a new request a new item was created into the list )

Finally i noticed that the Event receiver is working when item added into the list only and not working when i add new item to list from Outside!

Note that i used this scenario before and it was worked.

My event receiver code:

using System;
using System.Security.Permissions;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.Workflow;
using ProjectName.SharePoint.Utility.Code;
using ProjectName.SharePoint.EventReceiver.Code;

namespace ProjectName.SharePoint.EventReceiver.TestEvtRvr
{
public class TestEvtRvr : SPItemEventReceiver
{
    /// <summary>
    /// An item was added.
    /// </summary>
    public override void ItemAdded(SPItemEventProperties properties)
    {
        if (Helper.GetListInternalName(properties, properties.List.DefaultDisplayFormUrl).Equals(ListName.Test))
        {
            RequestDetails requestDetails = new RequestDetails();

            requestDetails.emailTemplatetListInternalName = "EmailTemplates";
            requestDetails.userTemplate = "Test_USER";//User template, stored in SP list.

            try
            {
                if (!String.IsNullOrWhiteSpace(Convert.ToString(properties.AfterProperties[Columns.Email])))
                    requestDetails.email = Convert.ToString(properties.AfterProperties[Columns.Email]);

                DateTime saveNow = DateTime.Now;
                requestDetails.created = saveNow.ToString();                    

                if (properties.ListItem.Fields.ContainsField(Columns.RequestNumber))
                    properties.ListItem[Columns.RequestNumber] = requestDetails.requestNumber;
                properties.ListItem.Update();

                requestDetails.emailTokens.Add("[Email]", requestDetails.email);
                requestDetails.emailTokens.Add("[RequestNumber]", requestDetails.requestNumber);
                requestDetails.emailTokens.Add("[CreatedOn]", requestDetails.created);

            }
            catch (Exception ex)
            {
                Utilities.WriteToEventViewer(ex);
            }

            if (!String.IsNullOrEmpty(requestDetails.email))
            {
                try
                {
                    //Send Email to User
                    if (!string.IsNullOrWhiteSpace(requestDetails.userTemplate))
                    {
                        Helper.SendEmailFromTemplate(requestDetails.email, null, null, requestDetails.userTemplate, requestDetails.emailTokens, properties.OpenWeb(), requestDetails.emailTemplatetListInternalName);
                    }
                    else
                    {
                        Utilities.WriteToEventViewer("\nTest: User Template is not defined");
                    }                        
                }
                catch (Exception ex)
                {
                    Utilities.WriteToEventViewer(ex);
                }
            }
            base.ItemAdded(properties);
        }
    }
}

Element.xml:

<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
  <Receivers ListUrl="Lists/Test">
      <Receiver>
        <Name>TestEvtRvrItemAdded</Name>
        <Type>ItemAdded</Type>
        <Assembly>$SharePoint.Project.AssemblyFullName$</Assembly>
        <Class>ProjectName.SharePoint.EventReceiver.TestEvtRvr.TestEvtRvr</Class>
        <SequenceNumber>10000</SequenceNumber>
      </Receiver>
  </Receivers>
</Elements>

I posted this question in multiple places and I got no answer..

how it can be possible, looking for help. Please suggest?