how to implement message security in wcf [duplicate]

This question is an exact duplicate of:

• Message signing in wcf using x509 certificate

I want to implement message signing using WCF. I know how to implement message signing in WSE, but i am facing issues while try to implement the same in WCF. I have already installed X509 certificate on my local machine, I have also successfully tested my application in SOAP UI tool. Below is the code i am using to achieve the same:

 public X509SecurityToken GetSecurityToken(string subjectName)
{
    X509SecurityToken objX509SecurityToken = null;
    X509Store objX509Store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
    objX509Store.Open(OpenFlags.ReadOnly);
    try
    {
        X509Certificate2Collection objX509Certificate2Collection = objX509Store.Certificates.Find(X509FindType.FindBySubjectName, subjectName, true);

        X509Certificate2 objX509Certificate2;
        if (objX509Certificate2Collection.Count == 1)
        {
            objX509Certificate2 = objX509Certificate2Collection[0];
            objX509SecurityToken = new X509SecurityToken(objX509Certificate2);
        }
        else
        {
            objX509SecurityToken = null;
        }
    }
    catch (Exception ex)
    {
        objX509SecurityToken = null;
    }
    finally
    {
        if (objX509Store != null)
            objX509Store.Close();
    }
    return objX509SecurityToken;
}
 // Get an X.509 certificate for signing the SOAP message.
        X509SecurityToken signatureToken = GetSecurityToken("subjectName");
        if (signatureToken == null)
        {
            throw new SecurityFault("Message Requirements could not be satisfied.");
        }

        // Add the X.509 certificate to the header.
        security.Tokens.Add(signatureToken);

        // Specify that the SOAP message is signed using this X.509
        // certifcate.
        MessageSignature sig = new MessageSignature(signatureToken);
        security.Elements.Add(sig);