In Microsoft Dynamics CRM 2011 and Microsoft Dynamics CRM Online, the programming model has been changed to use native .NET types whenever possible. A beautiful post from Resultondemand explains it all, with all credit to their great job the excerpts of the post is :
Type Mapping Between Versions
The following table shows the mapping between the defined type for an entity attribute, the type that is used in a record, and the type that was used in Microsoft DynamicsCRM4.0.
The following table shows the mapping between the defined type for an entity attribute, the type that is used in a record, and the type that was used in Microsoft DynamicsCRM4.0.
| Attribute Type | Microsoft Dynamics CRM 2011 Type | Microsoft DynamicsCRM4.0 Type |
| AttributeTypeCode.Boolean | bool or System.Boolean | CrmBoolean |
| AttributeType.CalendarRules | EntityCollection | DynamicEntity[] or calendarrule[] |
| AttributeType.Customer | EntityReference | Customer |
| AttributeType.DateTime | System.DateTime | CrmDateTime |
| AttributeType.Decimal | decimal or System.Decimal | CrmDecimal |
| AttributeType.Double | double or System.Double | CrmFloat |
| AttributeType.Integer | int or System.Integer | CrmNumber |
| AttributeType. Internal | System.Object Not used in records. | Not used in records. |
| AttributeType.Lookup | EntityReference | Lookup |
| AttributeType.Memo | string or System.String | System.String |
| AttributeType.Money | Money | CrmMoney |
| AttributeType.Owner | EntityReference | Owner |
| AttributeType.PartyList | EntityCollection or ActivityParty[] | activityparty[] or DynamicEntity [] |
| AttributeType.Picklist | OptionSetValue | Picklist |
| AttributeType.PrimaryKey | System.Guid | Key |
| AttributeType.String | System.String | System.String |
| AttributeType.State | OptionSetValue or enumeration generated for the entity state | EntityNameStateInfo |
| AttributeType.Status | OptionSetValue orint | Status |
| AttributeType.Uniqueidentifier | System.Guid | UniqueIdentifier |
| AttributeType.Virtual | System.Object Not used in records. | Not used in records. |
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