Account plugin early bound

CalculateTotalAmountAccountPlugin.cs

public class CalculateTotalAmountAccountPlugin : IPlugin
{
    public void Execute(IServiceProvider serviceProvider)
    {
        var context = serviceProvider.GetService(typeof(IPluginExecutionContext)) as IPluginExecutionContext;
        var serviceFactory = serviceProvider.GetService(typeof(IOrganizationServiceFactory)) as IOrganizationServiceFactory;
        var service = serviceFactory.CreateOrganizationService(context.UserId);

        var account = (context.InputParameters["Target"] as Entity).ToEntity<Account>();
        account.new_totalsum = account.new_netamount + account.new_margin;
    }
}