“EntityState must be set to null, Created (for Create message) or Changed (for Update message)” when attempting to update an entity in CRM 2011

dynamics-crm-2011

I am using the following code to update an entity. 

Service.Update(_policy);

where policy is a class generated using CrmSvcUtil.exe

public partial class new_policy : Microsoft.Xrm.Sdk.Entity, System.ComponentModel.INotifyPropertyChanging, System.ComponentModel.INotifyPropertyChanged

I retrieve the policies using LINQ, then update one attribute (an EntityReference) and then attempt the update

When this code runs I get the following error message:

EntityState must be set to null, Created (for Create message) or
Changed (for Update message)

There are other entities generated in the same way that I can update.

I tried 

_policy.EntityState = EntityState.Changed

but then I get a message saying

The entity is read-only and the 'EntityState' property cannot be
modified. Use the context to update the entity instead.

Does anyone know what is causing this?

Best Answer

You have to tell your crmContext (use appropriate name) what to do with the changes.

You should add crmContext.UpdateObject(contact); before crmContext.SaveChanges();

See also How to update a CRM 2011 Entity using LINQ in a Plugin?

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