NGWS SDK Documentation  

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20.1.4 The DispId attribute

The DispId attribute is used to specify an OLE Automation DISPID. (A DISPID is an integral value that identifies a member in a dispinterface.)

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Field | AttributeTargets.Property)]
public class DispIdAttribute: System.Attribute
{
   public DispIdAttribute(int value) {…}
   public int Value { get {…} }
}