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multiple update data using put method web api

How to multiple update data using put method web api. I have used single update but i am unable to write code for multiple update.

   public HttpResponseMessage Put(DelegateTable delegatestable)
        {
            try
            {
             
                using (var ctx = new ShowContext())
                {

                    var delegatedata = ctx.delegates.FirstOrDefault(s => s.Barcode__c == delegatestable.Barcode__c);

                    if (delegatedata != null)
                    {
                        if (delegatestable.Salutation__c!=null)
                        {
                            delegatedata.Salutation__c = delegatestable.Salutation__c;
                        }
                        if (delegatestable.First_Name__c != null)
                        {
                            delegatedata.First_Name__c = delegatestable.First_Name__c;
                        }
                        if (delegatestable.Last_Name__c != null)
                        {
                            delegatedata.Last_Name__c = delegatestable.Last_Name__c;
                        }
                        if (delegatestable.Account_Name__c != null)
                        {
                            delegatedata.Account_Name__c = delegatestable.Account_Name__c;
                        }
                        if (delegatestable.Contact_Email__c != null)
                        {
                            delegatedata.Contact_Email__c = delegatestable.Contact_Email__c;
                        }
                        if (delegatestable.Category__c != null)
                        {
                            delegatedata.Category__c = delegatestable.Category__c;
                        }
                        if (delegatestable.Conference_Type__c != null)
                        {
                            delegatedata.Conference_Type__c = delegatestable.Conference_Type__c;
                        }
                        if (delegatestable.Conference_Selection__c != null)
                        {
                            delegatedata.Conference_Selection__c = delegatestable.Conference_Selection__c;
                        }
                        if (delegatestable.Payment_Status_Interface__c != null)
                        {
                            delegatedata.Payment_Status_Interface__c = delegatestable.Payment_Status_Interface__c;
                        }
                        
                        //  delegatedata.Barcode__c = delegatestable.Barcode__c;

                        ctx.SaveChanges();
                        return Request.CreateResponse(HttpStatusCode.OK, "Record updated");
                    }
                    else
                    {
                        return Request.CreateResponse(HttpStatusCode.NoContent, delegatedata);
                    }
                }
            }
            catch (Exception ex)
            {

                return Request.CreateResponse(HttpStatusCode.BadGateway, ex);
            }
        }

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using json for updating data through postman application

sana khan

ASKER

Tried below code for multiple update but how to write json format for it in postman application to test it. Please help

 public HttpResponseMessage Put(List<DelegateTable> delegatestable)
        {
            try
            {
             
                using (var ctx = new ShowContext())
                {

                    foreach (DelegateTable item in delegatestable)
                    {
                        //DelegateTable _ObjdelegateTable = new DelegateTable();
                        var delegatedata = ctx.delegates.FirstOrDefault(s => s.Barcode__c == item.Barcode__c);

                        if (delegatedata != null)
                        {
                            if (item.Salutation__c != null)
                            {
                                delegatedata.Salutation__c = item.Salutation__c;
                            }
                            if (item.First_Name__c != null)
                            {
                                delegatedata.First_Name__c = item.First_Name__c;
                            }
                            if (item.Last_Name__c != null)
                            {
                                delegatedata.Last_Name__c = item.Last_Name__c;
                            }
                            if (item.Account_Name__c != null)
                            {
                                delegatedata.Account_Name__c = item.Account_Name__c;
                            }
                            if (item.Contact_Email__c != null)
                            {
                                delegatedata.Contact_Email__c = item.Contact_Email__c;
                            }
                            if (item.Category__c != null)
                            {
                                delegatedata.Category__c = item.Category__c;
                            }
                            if (item.Conference_Type__c != null)
                            {
                                delegatedata.Conference_Type__c = item.Conference_Type__c;
                            }
                            if (item.Conference_Selection__c != null)
                            {
                                delegatedata.Conference_Selection__c = item.Conference_Selection__c;
                            }
                            if (item.Payment_Status_Interface__c != null)
                            {
                                delegatedata.Payment_Status_Interface__c = item.Payment_Status_Interface__c;
                            }

                            //  delegatedata.Barcode__c = delegatestable.Barcode__c;

                            ctx.SaveChanges();
                            return Request.CreateResponse(HttpStatusCode.OK, "Record updated");
                        }
                        else
                        {
                            return Request.CreateResponse(HttpStatusCode.NoContent, delegatedata);
                        }
                    }
                    var message = Request.CreateResponse(HttpStatusCode.Created, delegatestable);
                    message.Headers.Location = new Uri(Request.RequestUri.ToString());
                    return message;
                }
            }
            catch (Exception ex)
            {

                return Request.CreateResponse(HttpStatusCode.BadGateway, ex);
            }
        }

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