SPUserCustomAction.RegistrationId property

Gets and sets the identifier of the list or item content type that this custom action is associated with, or the file type or program identifier (ProgID).

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

public virtual string RegistrationId { get; set; }

Property value

Type: System.String
The registration identifier.
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