This attribute is attached to a parameter to marshal it as an in parameter. By default, parameters are marshaled based on their modifiers, so this attribute is only necessary if you want to override the defaults. Parameters with no modifiers are marshaled as [In] . Parameters with the ref modifier are marshaled as [In , Out] . Parameters with the out modifier are marshaled as [Out] . public sealed class InAttribute : Attribute { // Public Constructors public InAttribute ( ); } HierarchySystem.Object System.Attribute InAttribute Valid OnParameter |