C# code to add multiple attachments in SharePoint list programmatically

Lets assume we are using file upload through a file upload control which add an attachment to a list item.

using (SPSite oSPsite = new SPSite(http: //website Url/))

{

     using (SPWeb oSPWeb = oSPsite.OpenWeb())

      {

           oSPWeb.AllowUnsafeUpdates = true;

            // Fetch the List

            SPList list = oSPWeb.Lists["MyList"];

            // Get the List item

            SPListItem listItem = list.GetItemById(1);

           

            // Get the Attachment collection

            SPAttachmentCollection attachmentCollection = listItem.Attachments;

            Stream attachmentStream;

            Byte[] attachmentContent;

             // Get the file from the file upload control

            if (this.fileDocAttach.HasFile)

            {

                     attachmentStream = this.fileDocAttach.PostedFile.InputStream;

                 

                     attachmentContent = new Byte[attachmentStream.Length];

                     attachmentStream.Read(attachmentContent, 0, (int)attachmentStream.Length);

                    attachmentStream.Close();

                    attachmentStream.Dispose();

                     // Add the file to the attachment collection

                     attachmentCollection.Add(this.fileDocAttach.FileName, attachmentContent);

            }

            // Update th list item

            listItem.Update();

            oSPWeb.AllowUnsafeUpdates = false;

       }

 }

Now retract all the attachments from a specific sharepoint list item.

try {   // Set the Site Url   SPSite objSite = new SPSite("http://TestsiteUrl/");   using (SPWeb objWeb = objSite.OpenWeb())   {   objWeb.AllowUnsafeUpdates = true;    // Get the List   SPList objList = objWeb.Lists["MyListName"];   // Get the item by ID   SPListItem objItem = objList.GetItemById(1);   // Get the attachments of the item   SPAttachmentCollection objAttchments = objItem.Attachments;   // Iterate the attachments   foreach (string fileName in objItem.Attachments)   {     // Perform action on the extracted attachment   }   objWeb.AllowUnsafeUpdates = false;   } } catch (Exception ex) {   MessageBox.Show(ex.Message); }