Sample Plugin Code

using System;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;

public class SamplePlugin : IPlugin
{
    public void Execute(IServiceProvider serviceProvider)
    {
        //Get the execution context from the service provider.
        IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));

        //Get the service factory and create an organization service.
        IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));

        IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

       try
            {
                //Create a new account record.
                Entity account = new Entity("account");
                account["name"] = "Sample Account";
                Guid accountId = service.Create(account);
                Console.WriteLine("Created Account with ID: " + accountId);

                //Retrieve the created account record.
                Entity retrievedAccount = service.Retrieve("account", accountId, new ColumnSet("name"));
                string accountName = retrievedAccount.GetAttributeValue<string>("name");
                Console.WriteLine("Retrieved Account: " + accountName);

                //Update the account record.
                retrievedAccount["name"] = "Updated Sample Account";
                service.Update(retrievedAccount);
                Console.WriteLine("Updated Account: " + accountName);

                //Create a new contact record.
                Entity contact = new Entity("contact");
                contact["firstname"] = "John";
                contact["lastname"] = "Doe";
                Guid contactId = service.Create(contact);
                Console.WriteLine("Created Contact with ID: " + contactId);

                //Associate the contact with the account using a relationship.
                service.Associate("account", accountId, new Relationship("contact_customer_accounts"), new EntityReferenceCollection() { new EntityReference("contact", contactId) });
                Console.WriteLine("Associated Contact with Account");

                //Assign the contact to a specific team using AssignRequest.
                AssignRequest assignRequest = new AssignRequest
                {
                    Assignee = new EntityReference("team", new Guid("TEAM-GUID-HERE")), // Specify the team's GUID
                    Target = new EntityReference("contact", contactId)
                };
                service.Execute(assignRequest);
                Console.WriteLine("Assigned Contact to Team");

                //Retrieve all contacts associated with the account.
                QueryExpression query = new QueryExpression("contact");
                query.Criteria.AddCondition(new ConditionExpression("contactid", ConditionOperator.Equal, contactId));
                EntityCollection associatedContacts = service.RetrieveMultiple(query);
                foreach (var associatedContact in associatedContacts.Entities)
                {
                    Console.WriteLine("Associated Contact: " + associatedContact.GetAttributeValue<string>("fullname"));
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error: " + ex.Message);
            }
    }
}