An entity object cannot be referenced by multiple instances of IEntityChangeTracker.

 protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
                     TableCell cell = GridView1.Rows[e.RowIndex].Cells[1];

                     _process.DeleteAttachmentByID(Convert.ToInt32(cell.Text));
                    
                 
        }

----**************************************---------


 public void DeleteAttachmentByID(int AttachmentID)
        {

            var reqAttach = GetRequestAttachmentByID(4);

            RequestAttachmentRepository rep = new RequestAttachmentRepository();            

            rep.DeleteEntity(reqAttach);
        }


_*************************************************--

 public void DeleteEntity(T entity)
        {
            Context.Entry<T>(entity).State = EntityState.Deleted;
            Context.SaveChanges();
        }

        

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 public void CreateQuoteFile(Dictionary<string, string> changes)
        {
            string fileName = CreateXmlfile("License","CA");
            XDocument doc = XDocument.Load(fileCreateQuotePath+fileName);
            foreach (var update in changes)
            {
                var element = doc.Descendants(update.Key).FirstOrDefault(); //element from XML file
                var elementID = doc.Descendants(update.Key).Select(b=>b.Attribute("ID")).FirstOrDefault(); //element ID from XML file

                //if (elementID != null) 
                if (elementID == update.Key)
                {
                    element.Value = update.Value;
                }
            }
            string fileNameNew = Guid.NewGuid().ToString() + ".xml";
            doc.Save(fileCreateQuotePath + fileNameNew)

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<select class="select2" id="bondState" name="bondState" onchange="fnSaveSingleData(this.name,'1')" data-placeholder="Choose Bond State...">
                                    <option value=""></option>
                                    @foreach (var item in Model.stateList)
                                    {
                                        <option value=@item>@item</option>
                                    } 
                                </select>

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System.InvalidOperationException was unhandled
  Message="An error occurred creating the form. See Exception.InnerException for details.  The error is: The type initializer for 'MyProject.Singleton' threw an exception."
  Source="Prj - MyProject"
  StackTrace:
       at MyProject.My.MyProject.MyForms.Create__Instance__[T](T Instance) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 190
       at MyProject.My.MyProject.MyForms.get_F_Login()
       at MyProject.My.MyApplication.OnCreateMainForm() in C:\Users\xxxxxxxx\Documents\Source_MyProject\Prj-MyProject\Prj\My Project\Application.Designer.vb:line 35
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at MyProject.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: System.TypeInitializationException
       Message="The type initializer for 'MyProject.Singleton' 

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<select class="select2" id="bondState" name="bondState" onchange="fnSaveSingleData(this.name,'1')" data-placeholder="Choose Bond State...">
                                    <option value=""></option>
                                    @foreach (var item in Model.stateList)
                                    {
                                        <option value=@item>@item</option>
                                    } 
                                </select>


<select class="select2" onchange="fnSaveSingleData('bondName','0')" id="bondName" name="bondName" data-placeholder="Choose bond name(s)...">
                                    <option value=""></option>
                                    @foreach (var item in Model.bondNameList)
                                    {
                                        <option value=@item>@item</option>
                                    }                                     
                                </select>



js:

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 public ActionResult Index()
        {
            return View(StateList());
        }


 private List<string> StateList()
        {
            List<string> str = new List<string>();
            XElement xelement = XElement.Load(fileBondList);
            foreach (XElement xEle in xelement.Descendants("State"))
            {
                str.Add((string)xEle);
            }
            return str;
        }

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    <style type="text/css">
        .lnkBtnTFBlue {
            display: none;
        }

        .LockOff {
            display: none;
            visibility: hidden;
        }

        .LockOn {
            font: arial;
            font-size: xx-large;
            font-weight: bolder;
            display: block;
            visibility: visible;
            position: absolute;
            z-index: 50000;
            top: 0px;
            left: 0px;
            width: 105%;
            height: 105%;
            background-color: #CCC;
            text-align: center;
            padding-top: 20%;
            filter: alpha(opacity=75);
            opacity: 1.5;
        }
    </style>

    <script type="text/javascript">
        $(document).ready(function (jQuery) {
            function LockScreen(str) {
                var lock = document.getElementById('LockPane');
                if (lock)
                    lock.className = 'LockOn';

                if (str != '') {
                    lock.innerHTML = str;
                }
            }
        });
</script>
.
.
.
    </form>
    <script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>
    <script type="text/javascript" src="js/response.min.js"></script>
    

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