The operation cannot be completed because the DbContext has been disposed

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C#

entity-framework

Good Day Guys


I am sitting with an issue that I am struggling to solve my code works for a while andx then it breaks and I get the following error . The operation cannot be completed because the DbContext has been disposed. Below is my code what Am I doing wrong. Any help would be appreciated.

List<lib.imagemaster> imageList = new List<lib.imagemaster>();
       public const string KEY_FIELD_ReferenceNumber = "ReferenceNumber";
       public const string KEY_FIELD_ImageNumber = "ImageNumber";
       public const string KEY_FIELD_IsIndexed = "IsIndexed";

       public MainForm()
       {
           InitializeComponent();
       }

       private void btnGetIndexingFaults_Click(object sender, EventArgs e)
       {
           imageList = new List<lib.imagemaster>();
           dgvImageDetails.Columns.Clear();
           try
           {
               using (DocumentImagingDB db = new DocumentImagingDB())
               {
                   // Get Images for the previous 2 days
                   DateTime fromDate = DateTime.Now.AddDays(Properties.Settings.Default.DaysToCheck);
 //////// this Line  is where it breaks                 var images = db.Images.Where(i =&gt; i.SubmitDateTime &gt;=        fromDate).ToList();
                   Application.DoEvents();
                   if (images.Count() &gt; 0)
                   {
                       IntegrationAccessLayer.AccessLayerService ALS = new IntegrationAccessLayer.AccessLayerService();
                       // Check each image against AS400
                       images.ToList().ForEach(i =&gt;
                       {
                           // Check "IsIndexed" from Metadata
                           List<integrationaccesslayer.keyvalue> keyValue = new List<integrationaccesslayer.keyvalue>();
                           string[] strArr = new string[0];

                           keyValue.Add(new IntegrationAccessLayer.KeyValue { Key = KEY_FIELD_ImageNumber, Value = i.ImageNumber });
                           IntegrationAccessLayer.ImageDetails[] imageDetails = ALS.GetImageDetails(keyValue.ToArray(), strArr);

                           bool isIndexed = false;

                           imageDetails[0].metaData.ToList().ForEach(md =&gt;
                           {
                               if (md.Key == KEY_FIELD_IsIndexed && md.Value == "true")
                               {
                                   isIndexed = true;
                               }
                           });
                           Application.DoEvents();
                           if (isIndexed)
                           {
                               lib.ImageMaster image = lib.TapeHelper.DoRequest<lib.imagemaster>("Document", "ws_getimagemaster", new lib.ImageNumber { imageNumber = i.ImageNumber });

                               if (image != null && image.IMAGENUMBER != "")
                               {
                                   // Check if BDZ exists.
                                   string indexedPath = db.ImagingSettings.FirstOrDefault().AS400URI.Replace("%YYYY", DateTime.Now.Year.ToString());
                                   indexedPath = indexedPath.Replace("MM%", DateTime.Now.Month.ToString().PadLeft(2, '0'));

                                   string pathURI = indexedPath + "\\" + i.ImageNumber + ".BDZ";

                                   if (!File.Exists(pathURI))
                                   {
                                       // Add Image to List
                                       imageList.Add(image);
                                       txtReindexCount.Text = imageList.Count.ToString();
                                       Application.DoEvents();
                                   }
                               }
                           }

                       });
                       txtReindexCount.Text = imageList.Count.ToString();
                       dgvImageDetails.DataSource = imageList;
                       Application.DoEvents();

                   }
               }
           }
           catch (Exception ex)
           {
               MessageBox.Show("Oops...it broke", "Aaaaahhhhh!!!", MessageBoxButtons.OK, MessageBoxIcon.Error);
           }
       }

Kind regards