You inherit from the SoapHeader Class to implement it in your applications :

SOAPHeader.Actor Property
The SoapHeader.Actor property defines the recipient of a SOAPHeader. This does not have to be the same recipient as the Body of the SoapHeader and consequently canpoint to a different recipient or URI.

SOAPHeader.DidUnderstand Property
ASP.NET throws a SoapHeaderException if the response of an XML Web Service call has it's SoapHeader.DidUnderstand property set to false.

SOAPHeader.MustUnderstand Property
The SoapHeader.MustUnderstand property indicates if a node must understand or process a specific SoapHeader. A Web Service must respond with a SOAPHeader.DidUnderstand = True if the MustUnderstand property is set to true otherwise the SoapHeaderException will be raised by ASP.NET and the return information discarded.

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