Sharepointte mail adresi değiştirme

bu linklere  bakin 

 http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spfieldlookupvalue.aspx 

 http://www.learningsharepoint.com/2011/03/31/addingupdatingretrivingspquery-lookup-fields-in-sharepoint/   

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    SPFieldLookupValue value = new SPFieldLookupValue(customer.ID, customer.ID.ToString());
    order[lookupFld.Id] = value.ToString();
    order.Update();

    SPFieldLookupValue newValue = new SPFieldLookupValue(i, item["ID"].ToString());

    myListItem["emp_id"] = newValue.ToString();

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using Microsoft.SharePoint;
using Microsoft.SharePoint.Administration;
using Microsoft.SharePoint.WebControls;
using Microsoft.Office.Server.ApplicationRegistry.Infrastructure;
using Microsoft.SharePoint.Portal.WebControls;
using Microsoft.Office.Server.ApplicationRegistry.MetadataModel; 

private string UpdateListItem(SPListItem item, BusinessDataField bizDataField, LobSystemInstance sysinst, Entity entity, Microsoft.Office.Server.ApplicationRegistry.MetadataModel.View view, string[] secondaryBdcFieldNames, string[] secondaryWssFieldNames, string ObjectValueID)
  {
   string bdcFieldName = bizDataField.BdcFieldName;
   //string encodedId = null;
   object[] objArray = new object[] { ObjectValueID };
   IList<object> identifierValues = null;
   object[] objArray2 = null;
   List<Field>.Enumerator enumerator;
   //encodedId = (string)item[bizDataField.RelatedField];
   try
   {
    identifierValues = entity.FindSpecific(objArray, sysinst).GetIdentifierValues();
   }
   catch (Exception ex)
   {
    return ex.Message;
   }

   objArray2 = new object[identifierValues.Count];

   for (int i = 0; i < identifierValues.Count; i++)
   {
    objArray2[i] = identifierValues[i];
   }
   item[bizDataField.RelatedField] = EntityInstanceIdEncoder.EncodeEntityInstanceId(objArray2);
   enumerator = view.Fields.GetEnumerator();
   Microsoft.Office.Server.ApplicationRegistry.Runtime.IEntityInstance instance = entity.FindSpecific(objArray2, sysinst);
   Field field;
   string name;
   while (enumerator.MoveNext())
   {
    field = enumerator.Current;
    name = field.Name;
    if (name == bdcFieldName)
    {
     item[bizDataField.InternalName] = Convert.ToString(instance.GetFormatted(field));
    }
    for (int i = 0; i < secondaryBdcFieldNames.Length; i++)
    {
     if (secondaryBdcFieldNames[i] == field.Name)
     {
      item[secondaryWssFieldNames[i]] = Convert.ToString(instance.GetFormatted(field));
     }
    }
   }
   return "Success";
  }

   //Update business Data Field
   SPField fieldByInternalName = list.Fields.GetFieldByInternalName("Customer"); //This is the column name in the list

   if (!(fieldByInternalName is BusinessDataField))
   {
    throw new BusinessDataListConfigurationException("The field Customer is not a business data field");

   }

   BusinessDataField bizDataField = (BusinessDataField)fieldByInternalName;
   string[] secondaryFieldsNames = bizDataField.GetSecondaryFieldsNames();
   string[] secondaryWssFieldNames = new string[0];
   string property = bizDataField.GetProperty("SecondaryFieldWssNames");
   secondaryWssFieldNames = property.Split(new char[] { ':' });

   sysinst = ApplicationRegistry.GetLobSystemInstanceByName(bizDataField.SystemInstanceName);
   entity = sysinst.GetEntities()[bizDataField.EntityName];
   specificFinderView = entity.GetSpecificFinderView();
   //listItem is a reference to SPListItem that you want to add or update
   //txtCustomer.Text.Trim() is the identity of the BDC that you want to select
   string Message = UpdateListItem(listItem, bizDataField, sysinst, entity, specificFinderView, secondaryFieldsNames, secondaryWssFieldNames, txtCustomer.Text.Trim());
   if (!Message.Equals("Success"))
   {
    lblMessage.Text = "Customer Not Found";
   }