MustUndrestand Attribute in soap header

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WCF

hey guys...

I have a big problem with mustundrestand attribute in my WCF client ...

I should set the value into "0" but I found no way to do this .

could any body please help me ?! :(

this is my Soap header :

<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing">
  <s:Header>
    <a:Action s:mustUnderstand="1"/>
    <a:MessageID>urn:uuid:998aee14-b393-4ba9-8977-229e6fe75bcc</a:MessageID>
    <a:ReplyTo>
      <a:Address>http://www.w3.org/2005/08/addressing/anonymous</a:Address>
    </a:ReplyTo>
    <VsDebuggerCausalityData xmlns="http://schemas.microsoft.com/vstudio/diagnostics/servicemodelsink">uIDPowrDSQ7UliVNhtKY1gFPIaQAAAAAZlsQ0cJRu0KyOLKwou/SKmW2IUdILn5Jp3ig1wkdEL8ACQAA</VsDebuggerCausalityData>
    <a:To s:mustUnderstand="1">http://127.0.0.1:44006/ilws/InstantLinkSOA</a:To>
  </s:Header>