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SPFieldLookup.AllowMultipleValues property

Gets or sets a Boolean value that specifies whether multiple values can be used in the lookup field.

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

public virtual bool AllowMultipleValues { get; set; }

Property value

Type: System.Boolean
true to specify that multiple values can be used in the field; otherwise, false. The default is false.

You cannot set a deletion constraint on a lookup field that allows multiple values.

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