Q:

creating a client to call a web service without a wsdl in c#

I need to connect to a web service without knowing the wsdl; the only info I have is a sample request like the one below but I have no idea where to start from to build this xml; for example what is wsse:BinarySecurityToken? and do I have to create also prefixes like "wsu" or "wsse" ???
The info below are from a test server so there are any sensitive data disclosed here.
<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">
        <wsse:UsernameToken wsu:Id="Username-123" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
            <wsse:Username>gen-emiswebmobile.e-mis.co.uk</wsse:Username>
        </wsse:UsernameToken>
        <wsu:Timestamp wsu:Id="Timestamp-1" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
            <wsu:Created>2017-06-29T22:42:44.870Z</wsu:Created>
            <wsu:Expires>2017-06-29T22:57:44.870Z</wsu:Expires>
        </wsu:Timestamp>
        <wsse:BinarySecurityToken wsu:Id="CertId-4468839874371617328" EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">MIIFVjCCBD6gAwIBAgIHTvS0LmWypjANBgkqhkiG9w0BAQsFADCBtDELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0FyaXpvbmExEzARBgNVBAcTClNjb3R0c2RhbGUxGjAYBgNVBAoTEUdvRGFkZHkuY29tLCBJbmMuMS0wKwYDVQQLEyRodHRwOi8vY2VydHMuZ29kYWRkeS5jb20vcmVwb3NpdG9yeS8xMzAxBgNVBAMTKkdvIERhZGR5IFNlY3VyZSBDZXJ0aWZpY2F0ZSBBdXRob3JpdHkgLSBHMjAeFw0xNDEwMDgwNzMzNDdaFw0xNjEwMDgwNzMzNDdaMEsxITAfBgNVBAsTGERvbWFpbiBDb250cm9sIFZhbGlkYXRlZDEmMCQGA1UEAxMdZ2VuLWVtaXN3ZWJtb2JpbGUuZS1taXMuY28udWswggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCzpXaDzByOKYA0C1MCa2fzDzazgiJBqfHh08/kb4cf/8Vceu1mTst1ggVOrvIpTVf+jUmj05OYI1I5gSEUN+mEXOJv/mK5Fmalx+i7lIxRa3xT47KMcbAmmTzr1IY8CQUMGQhW7idDU680R2eO2n5x1q+2icViQb/Ooa23eBWgH+BwxhUqpi2NrvbHC/Xg3A8tkiIeZCsm5eyVbrzQykbFyeAKhX5ZBw+P0EKJB+mvfQ7clmyGbcBwNw3nPWscxOO2w/OYd7bh7VLiRK3Mgz6OYL3fHMc/tDsEXKXL1j+60ZVJXtZNrFykWNFsA14EV+unouf0cUZqi8kDhvG8ae+DAgMBAAGjggHTMIIBzzAMBgNVHRMBAf8EAjAAMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAOBgNVHQ8BAf8EBAMCBaAwNgYDVR0fBC8wLTAroCmgJ4YlaHR0cDovL2NybC5nb2RhZGR5LmNvbS9nZGlnMnMxLTg3LmNybDBTBgNVHSAETDBKMEgGC2CGSAGG/W0BBxcBMDkwNwYIKwYBBQUHAgEWK2h0dHA6Ly9jZXJ0aWZpY2F0ZXMuZ29kYWRkeS5jb20vcmVwb3NpdG9yeS8wdgYIKwYBBQUHAQEEajBoMCQGCCsGAQUFBzABhhhodHRwOi8vb2NzcC5nb2RhZGR5LmNvbS8wQAYIKwYBBQUHMAKGNGh0dHA6Ly9jZXJ0aWZpY2F0ZXMuZ29kYWRkeS5jb20vcmVwb3NpdG9yeS9nZGlnMi5jcnQwHwYDVR0jBBgwFoAUQMK9J47MNIMwojPX+2yz8LQsgM4wSwYDVR0RBEQwQoIdZ2VuLWVtaXN3ZWJtb2JpbGUuZS1taXMuY28udWuCIXd3dy5nZW4tZW1pc3dlYm1vYmlsZS5lLW1pcy5jby51azAdBgNVHQ4EFgQUfnm7SRUsh4sUkMHC41QY+Q3ysZ0wDQYJKoZIhvcNAQELBQADggEBAK3zIhwhU3N7bxGjRVTFsQDLvJBjrIeJiRHXTtPF8A/muYJdcapUTcz/cl8mu9hXN3po0WJQii2kttBQD7MAjHlIMDDY6iTDrEorqch0OUSc6tJe6KQlNdeE4Cng11/AlcTBNitxE8aNiC8PUsh4P4Se8jDNoa7ESSgv9MXpHUT+Dfx5wsM4CPkUMhdaQiPQPL4QzbwpphX+hD4DTGGkKR34HR91HLoUap/gOS97ZTUmUBtgOSSKGL+kVrs+HKA6+Zbv55ya0bYFHJikN/5R1XUgZX6l3VZJJvBnmFHETd2I6H/1/VKOiSoD4JNZf7cxfDRmi8cLixE6PdSM41ve6qw=</wsse:BinarySecurityToken>
        <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
            <SignedInfo>
                <CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
                <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
                <Reference URI="#Timestamp-1">
                    <Transforms>
                        <Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
                    </Transforms>
                    <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
                    <DigestValue>WOHqa2p3/ZcVQ2FU36OEU9gfYaI=</DigestValue>
                </Reference>
            </SignedInfo>
            <SignatureValue>q/ZGfYAacr6Vv/LwfyAwyxXGLVkJ7qXJYkMvrCludwNRaENHNR1LekPwVuMGQ95uoKzk9npEnefHrCD1+JmufKltDtXLIZmhUJNryhOcUHzSoDLjdCAOJ+Ylccf73fhI7uHJr63NlbmV6IVzTrb3RPpfoJDpuDqyrkqS0l4HQI3BkzbDYR3Eo3ce8oUzfZ32xpLTQ/LceI6DsaHMCtimxjhAJDa1NuRDbsosHgxw8MEms1hc5VwR4s2/h6GJEkz5EXegWkm9CBNlpgceaFF7HMUPZqm7PUTHTrsmfN9uEZlp4iaUQrCBPNwsju3dbD1nOxNAxQeGvx5RNL0xvY5emg==</SignatureValue>
            <KeyInfo Id="KeyId-4468839874371617327">
                <wsse:SecurityTokenReference wsu:Id="STRId-3E04823056058230" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
                    <wsse:Reference ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" URI="#CertId-4468839874371617328" />
                </wsse:SecurityTokenReference>
            </KeyInfo>
        </Signature>
    </wsse:Security>
    <Action xmlns="http://www.w3.org/2005/08/addressing">MiG</Action>
    <MessageID xmlns="http://www.w3.org/2005/08/addressing">84CF41DA-133A-442D-979B-D76697AF71BF</MessageID>
    <To xmlns="http://www.w3.org/2005/08/addressing">https://185.13.72.96/Miggateway</To>
    <ReplyTo xmlns="http://www.w3.org/2005/08/addressing">
        <Address>http://www.w3.org/2005/08/addressing/anonymous</Address>
    </ReplyTo>
</soap:Header>
<soap:Body>
    <q1:migRequest xmlns:q1="http://www.healthcaregateway.co.uk/mig">
        <q1:serviceDefinition>
            <q1:name>MIG.DATAEXTRACTIONSERVICE.EhrExtractRequest</q1:name>
            <q1:version>0.0.2</q1:version>
        </q1:serviceDefinition>
        <q1:serviceHeader>
            <q1:source xmlns:q1="http://www.healthcaregateway.co.uk/mig">
                <q1:identifier>externaldevuser:urn:hgl:addressing:ods:N00001</q1:identifier>
            </q1:source>
            <q1:target xmlns:q1="http://www.healthcaregateway.co.uk/mig">
                <q1:nationalCode>urn:hgl:addressing:ods:A00005</q1:nationalCode>
            </q1:target>
        </q1:serviceHeader>
        <q1:serviceContent>
            <q1:ehrExtractRequestv2-0 xmlns:q1="http://www.healthcaregateway.co.uk/mig">
                <q1:id>4df5cdb1-4a20-42a5-b604-6033eec5224d</q1:id>
                <q1:consent>
                    <q1:value>Given</q1:value>
                </q1:consent>
                <q1:provenance>
                    <q1:creationTime>2013-07-15T14:37:28.7273043Z</q1:creationTime>
                    <q1:system>
                        <q1:id>BED045C0-BC58-4934-8E11-2FC08F730060</q1:id>
                        <q1:name>EMISWebCR1 50002</q1:name>
                    </q1:system>
                </q1:provenance>
                <q1:patient>
                    <q1:primaryIdentifier type="NHS">8888888888</q1:primaryIdentifier>
                </q1:patient>
                <q1:requestSpecification>
                    <q1:id>654d8e02-6b09-4754-a095-968c397db560</q1:id>
                    <q1:responseFormat>OPENHR</q1:responseFormat>
                    <q1:request>
                        <q1:name>scm.diagnosis</q1:name>
                        <q1:includeAssociatedText>true</q1:includeAssociatedText>
                    </q1:request>
                </q1:requestSpecification>
            </q1:ehrExtractRequestv2-0>
        </q1:serviceContent>
    </q1:migRequest>
</soap:Body>

A:

You can look here for some code sample.
The xml you posted is the soap envelope xml and you should be able to send it as shown in the sample (with LoadXml) and get a response. (in the xml you posted you invoke the MiG action with migRequest).  
If you dont have the soap envelope request you will have to create one and it is the tricky part if you dont know which functions to call.
The structure of the request is this: (in your sample there is also security which is not present here)
<?xml version="1.0" encoding="utf-8"?>
 <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Body>
    <MethodFoo>
      <param1>value</param1>
      <param2>value</param1>
    </MethodFoo>
  </soap:Body>
</soap:Envelope>

Look here for more on the request message structure.

