On
For your first Plugin we will take a test scenario - on create of contact record our plugin will forcefully update its email address to "testemail@gmail.com" and to achieve this you just need to follow the below steps.

There are two parts to successfully run a plugin in MSCRM

1) Create Your Plugin
2) Resister your plugin

Plugin Creation

Step 1 - Open Visual studio


Step 2 - Go to File - New - and Click on Project


Step 3 - A dialogue will appear, from left navigation panel select Class Library template in Visual C#  and Enter Project and Solution name and hit on OK Button


Step 4 - Visual studio will create and open a blank class library template.Right Click on Project and click on Add References option


Step 5 - Reference Manager dialogue will open.From left navigation panel go to Assemblies - Framework then select two references and click on OK button
1)System.Runtime.Serialization
2) System.ServiceModel


Step 6 -  Right Click on Project and again click on Add References option, then in Reference Manager dialogue from left navigation panel go to Browse - Click on Browse button then select two references
1)System.Runtime.Serialization
2) System.ServiceModel



Step 7 -  After Click on Browse button go to your sdk (downloaded from prerequisites) - bin, then select the following dlls files and click on add and then OK button
1) miscrosoft.xrm.client.dll
2) Microsoft.Xrm.Sdk.dll


Step 8 -  Open the class named Class.cs from solution explorer and modify the below code in it.
If your namespace name and class name is different then remember to verify and update it.

Code Snippet : 


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

namespace My_First_Plugin
{
    public class Class1 : IPlugin     //{inherit the class Iplugin in your class}
    {
        public void Execute(IServiceProvider serviceProvider)        //{add the execute method}
        {
            // create context , service factory and service objects
            IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(Microsoft.Xrm.Sdk.IPluginExecutionContext));
            IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
            IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

            //to enter  value in Email field in contact entity

            //create an object of predefined class Entity and pass entity name as its parameter
            
            Entity Object = new Entity("contact");   // in place of contact you can write schema name of entity on which you want to preform operations

            Object.Attributes.Add("emailaddress1", "testemail@gmail.com");  //emailaddress1 is the schema name of the Email field in contact entity
             //testemail@gmail.com is the value

            //to update the record service.Update(object of the entity)
            service.Update(Object);

        }
    }
}

After updating your code your code will look like this 


Step 9 -  Right click on Project and click on Properties


Step 10 -  Now, we have to create a key. Go to Signing - select the checkbox "Sign the assembly" and click on <New..> option 


Step 11 -  Enter any name you want for your Key and click on OK button


Step 12 -  Click on Save Button


Step 13 - Go to BUILD from ribbon menu and select Build Solution option




Will Update this thread Soon 


Happy Coding 😊