Hi JMcCon,
Try below code to update the record:
var _LinqResult = from data in dataSourse
select data.singleValue;
using (_serviceProxy = new OrganizationServiceProxy(serverConfig.OrganizationUri, serverConfig.HomeRealmUri, serverConfig.Credentials, serverConfig.DeviceCredentials))
{
_service = (IOrganizationService)_serviceProxy;
Entity account = new Entity("account"); // Suppose you want to update the account entity
account["id"] = new Guid("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"); // set the guid of the target account record
account["name"] = _LinqResult;
_service.Update(account);
}
Make sure that _LinqResult datatype match to the target crm field datatype.