Put some assertions in my soap header

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C#

SOAP

I have a SOAP Header that contains only the Security tag, to which I need to add some Assertions, using c #, before making the call to the Web Service. How can I do?

What I have tried:

var b = new CustomBinding();
var sec = new AsymmetricSecurityBindingElement(
    new X509SecurityTokenParameters(X509KeyIdentifierClauseType.Any, SecurityTokenInclusionMode.Never),
    new X509SecurityTokenParameters(X509KeyIdentifierClauseType.Any, SecurityTokenInclusionMode.AlwaysToRecipient));
sec.MessageSecurityVersion = MessageSecurityVersion.WSSecurity10WSTrust13WSSecureConversation13WSSecurityPolicy12BasicSecurityProfile10;
sec.SecurityHeaderLayout = SecurityHeaderLayout.Strict;
sec.IncludeTimestamp = true;
sec.SetKeyDerivation(false);
sec.KeyEntropyMode = System.ServiceModel.Security.SecurityKeyEntropyMode.ServerEntropy;
sec.EnableUnsecuredResponse = true;

b.Elements.Add(sec);

b.Elements.Add(new TextMessageEncodingBindingElement(MessageVersion.Soap11, Encoding.UTF8));
b.Elements.Add(new HttpsTransportBindingElement());