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How to read, alter, and update back the item values inside <soapenv: Body> tag in AfterReceiveRequest() method

I am now implementing AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel, System.ServiceModel.InstanceContext instanceContext) method of IDispatchMessageInspector interface to intercet the WCF SOAP message.
System.ServiceModel.Channels.Message request as below
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/">
<soapenv:Header>
<To soapenv:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://localhost:8993/TLS.svc/soap</To>
<Action soapenv:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://tempuri.org/TLS/GetMerchant</Action>
</soapenv:Header>
<soapenv:Body>
<tem:GetMerchant>
<tem:item1>value1</tem:item1>
<tem:item2>value2</tem:item2>
</tem:GetMerchant>
</soapenv:Body>
</soapenv:Envelope>
I would like to read and alter the value of <tem:item1></tem:item1> <tem:item2></tem:item2> and update back to System.ServiceModel.Channels.Message request without damaging other message original properties
<soapenv:Envelope ... >
<soapenv:Header>
<To soapenv:mustUnderstand="1" ... </To>
<Action soapenv:mustUnderstand="1" ... </Action>
</soapenv:Header>
<soapenv:Body>
<tem:GetMerchant>
<tem:item1>Updatedvalue1</tem:item1>
<tem:item2>Updatedvalue2</tem:item2>
</tem:GetMerchant>
</soapenv:Body>
</soapenv:Envelope>

This post describes the way you can handle it at Dispatcher level, which will allow you to intercept all incoming messages. You just need to understand and read it carefully.
https://weblogs.asp.net/paolopia/writing-a-wcf-message-inspector

create soap request xml in c#

I am trying to consume a service .
Can any one help me how to generate a soap request as follows.
i want to construct a class and then serialize the class using soap formator and then post it to my service. I tried with the some online help but could not able to generate the required soap xml.
i am bit confused about the implementation .Can any one help me on this.
<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:iot="http://services.singp.com>
<soapenv:Header/>
<soapenv:Body>
<iot.performService>
<iot.input>
<iot.gsh><![CDATA[
<header xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://services.singp.com">
<GUID></GUID>
<CustID></CustID>
<RequestName></RequestName>
<TimeStamp>2017-06-09T10:49:03.49-05:00</TimeStamp>
</header>
]]></iot.gsh>
<iot.Body><![CDATA[
<CustStatus xmlns="http://services.singp.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<CustStatusAttributes>
<CustID>str1234</CustID>
<Action>str1234</Action>
</CustStatusAttributes>
<CustStatusInformation>
<ClientOrderNumber>745</ClientOrderNumber>
</CustStatusInformation>
</CustStatus>
]]></iot.Body>
</iot.input>
</iot.performService>
</soapenv:Body>
</soapenv:Envelope>

SOAP Header not understood by .NET client when calling Webservice

I've been trying to call a third-party webservice from a .NET client. I have had to set some custom headers for each request in order to adhere to their Authentication requirements.
I have used this answer in order for me to get the request header values to appear as so:
<?xml version="1.0" encoding="UTF-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" s:mustUnderstand="0">
<wsse:UsernameToken xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="UsernameToken-2">
<wsse:Username>Jimbob</wsse:Username>
<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">P#ssword</wsse:Password>
</wsse:UsernameToken>
</wsse:Security>
</s:Header>
<s:Body>
...
</s:Body>
</s:Envelope>
(I am doing this by setting the a custom <endpoint><headers /></endpoint> section in config)
I have inspected the request via Fiddler and it is sending the correct header values, and the webservice is returning expected results.
However, the client is throwing the following exception when it receives the result:
System.ServiceModel.ProtocolException : The header 'Security' from the namespace 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd' was not understood by the recipient of this message, causing the message to not be processed. This error typically indicates that the sender of this message has enabled a communication protocol that the receiver cannot process. Please ensure that the configuration of the client's binding is consistent with the service's binding.
The relevant part of the repsonse (from Fiddler) is this:
<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" soap:mustUnderstand="1">
<wsse:UsernameToken wsu:Id="UsernameToken-371676">
<wsse:Username>SOMEUSERTOKEN</wsse:Username>
<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">SOMEUSERTOKEN</wsse:Password>
</wsse:UsernameToken>
</wsse:Security>
</soap:Header>
<soap:Body>
...
<soap:Body>
</soap:Envelope>
Basically I'm now lost. I presume I need to perform some sort of message inspection to flag that header as understood, but it does seem quite a lot of heavy lifting just to interpret a result (which I'm already getting from the webservice).
Any help is much appreciated.

If you just want to do the authentication , I did used the following code for my c# console application and it worked. I used this code in the config file though under <system.serviceModel>-><client>-> <endpoint>
<headers>
<wsse:Security mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" >
<wsse:UsernameToken xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
<wsse:Username>SOMEUSERTOKEN</wsse:Username>
<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">SOMEUSERTOKEN</wsse:Password>
</wsse:UsernameToken>
</wsse:Security>
</headers>

Security Certificate on Webservices

I have a webservice from a partner that am developing against in C#. I have browsed it on SOAPUI and this is the request
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"xmlns:ser="http://service.bank.pmt.tpa" xmlns:xsd="http://bean.bank.pmt.tpa/xsd">
<soapenv:Header/>
<soapenv:Body>
<ser:processPaymentNotificationReport>
<!--Zero or more repetitions:-->
<ser:pmtNotifyReport>
<!--Optional:-->
<xsd:amountPaid>?</xsd:amountPaid>
<!--Optional:-->
<xsd:bankBranchCode>?</xsd:bankBranchCode>
<!--Optional:-->
<xsd:bankTransNo>?</xsd:bankTransNo>
<!--Optional:-->
<xsd:datePaid>?</xsd:datePaid>
<!--Optional:-->
<xsd:paymentRegTransNo>?</xsd:paymentRegTransNo>
<!--Optional:-->
<xsd:status>?</xsd:status>
<!--Optional:-->
<xsd:taxPayerName>?</xsd:taxPayerName>
<!--Optional:-->
<xsd:tin>?</xsd:tin>
<!--Optional:-->
<xsd:transactionId>?</xsd:transactionId>
</ser:pmtNotifyReport>
</ser:processPaymentNotificationReport>
when i input the parameters and browse, this is the response
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<soapenv:Fault xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
<faultcode>wsse:InvalidSecurity</faultcode>
<faultstring>Missing wsse:Security header in request</faultstring>
<detail/>
</soapenv:Fault>
</soapenv:Body>
</soapenv:Envelope>
I have reconstructed the request xml in my code then send the xml to the partner by invoking their url. Now i find out that i cannot hit their webservice until i implement the security certificate. I have no idea how i can import that security certificate and use it in my code, need some help pease.

Parsing Soap Response in VB.net

I have below Soap response XML string
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Header />
<soapenv:Body>
<qu:quotationResponse xmlns:qu="http://Reliance_RENEWAL_Quotation/IRenewal_Quotation">
<response><?xml version="1.0" encoding="UTF-8"?>
<RENEWAL-QUOTATION-RESPONSE>
<MESSAGE-DATA>
<ContractType>XYZ </ContractType>
<PremiumAmount>10000</PremiumAmount>
<PremiumSuspense>0.0</PremiumSuspense>
<NetAmmount>10000.0</NetAmmount>
<ContractPremiumStatus>Surrender </ContractPremiumStatus>
<ContractOwnerClientNumber>0501234</ContractOwnerClientNumber>
<OwnerName>SUDZ</OwnerName>
<LifeAssuredClientNumber>12312312</LifeAssuredClientNumber>
<LifeAssuredName>SUDZ </LifeAssuredName>
<PaidTodate>20110731</PaidTodate>
<ReinstatementFee>0.0</ReinstatementFee>
<ContractNumber>1122112211</ContractNumber>
</MESSAGE-DATA>
<ERROR-DETAILS>
<ErrorCode>No Errors</ErrorCode>
<ErrorDesc></ErrorDesc>
</ERROR-DETAILS>
</RENEWAL-QUOTATION-RESPONSE>
</response>
</qu:quotationResponse>
</soapenv:Body>
</soapenv:Envelope>
I need the value of ContractType, NetAmount etc
I tried but not able to parse.
What is best the way to parse above xml.
Please help.