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Multiple update data using put method web api

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);
            }
        }

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. I am using json for updating data through postman application. Single update is working through it properly but i dont know how to multiple update. Please help

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