Calling REST Web Service in Plugin

I was involved in a project where I have to consume REST Web services to integrate with Dynamics CRM 2016. Below plugin was used to perform this operation.

The web service used POST operation. and retrieved a specific authentication string present in response headers.

Prevent Delete on Desired Condition - CRM 2013 Plugin

Scenario: XYZ Pvt Ltd, wants to implement business logic of Delete prevention if value of Is Delete Field is No on Opportunity Entity. CRM 2013 will prevent deltetion of record if value of Is Delete Field is set to No and vice versa. 

Work Around: We have added a custom field on Opportunity Entity with Display name 'Is Delete' & Schema Name 'IsDelete'.

Solution: Below is the CRM 2013  Prevent Delete Plugin code.


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Crm.Sdk.Messages;


namespace PreventAccountDelete
{
    public class Class1:IPlugin
    {