Represents a choice field that allows multiple values.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online
The field value for the SPFieldMultiChoice class is contained in the SPFieldMultiChoiceValue class. For information about creating custom field value classes, see How to: Create a Custom Field Value Class.
If you set properties of the SPFieldMultiChoice class, you must call the Update method for the changes to take effect in the database.
The SPFieldMultiChoice class corresponds to the MultiChoice data type that is specified through the Type attribute of the Field element.Notes to Inheritors
In SharePoint Foundation, columns based on custom field types are read-only in Datasheet view.