[a33ik]

Подчистил код плагина. Попробуйте это:

using System;
using System.Collections.Generic;
using Microsoft.Win32;
using Microsoft.Crm.Sdk.Query;
// Microsoft Dynamics CRM namespaces
using Microsoft.Crm.Sdk;
using Microsoft.Crm.SdkTypeProxy;
using Microsoft.Crm.SdkTypeProxy.Metadata;
using System.Text;
namespace Crm.Plugins
{
    public class MyPlugin : IPlugin
    {
        private string _secureInformation;
        private string _unsecureInformation;
        public MyPlugin(string unsecureInfo, string secureInfo)
        {
            _secureInformation = secureInfo;
            _unsecureInformation = unsecureInfo;
        }
        public void Execute(IPluginExecutionContext context)
        {
            DynamicEntity entity = null;
            if (context.InputParameters.Properties.Contains(ParameterName.Target) && context.InputParameters.Properties[ParameterName.Target] is DynamicEntity)
            {
                entity = (DynamicEntity)context.InputParameters.Properties[ParameterName.Target];
            }
            else
            {
                return;
            }

            try
            {
                ICrmService crmService = context.CreateCrmService(true);

                decimal sum = ((CrmMoney)entity.Properties["new_esum"]).Value;
                String new_productname = "";

                if (entity.Properties.Contains("productid"))
                {
                    ColumnSet cs = new ColumnSet();
                    Lookup regarding = (Lookup)entity.Properties["productid"];
                    cs.Attributes.Add("name");
                    product _product = (product)crmService.Retrieve(EntityName.product.ToString(), regarding.Value, cs);
                    if (_product == null || _product.name == null)
                    {
                        return;
                    }
                    else
                    {
                        new_productname = _product.name;
                    }
                }

                QueryByAttribute query = new QueryByAttribute();
                query.ColumnSet = new AllColumns();
                query.EntityName = EntityName.productpricelevel.ToString();
                query.Attributes = new string[] { "productidname" };
                query.Values = new string[] { new_productname };

                BusinessEntityCollection retrieved = crmService.RetrieveMultiple(query);

                foreach (DynamicEntity product in retrieved.BusinessEntities)
                {
                    product["amount"] = new CrmDecimal(sum);
                    crmService.Update(product);
                }
            }
            catch (System.Web.Services.Protocols.SoapException ex)
            {
                throw new InvalidPluginExecutionException(String.Format("An error occurred in the {0} plug-in.", this.GetType().ToString()), ex);
            }
        }
    }
}