Calling a secure web service via C#

callSecureWebService.cs

private void button2_Click(object sender, EventArgs e)
{
    echoSecured.echoSecuredPortTypeClient client = new echoSecured.echoSecuredPortTypeClient("echoSecuredHttpsSoap11Endpoint");
    CallProxyApplication.echoSecured.echoStringRequest echoStringRequest = new echoSecured.echoStringRequest();
    CallProxyApplication.echoSecured.echoStringResponse echoStringResponse = new echoSecured.echoStringResponse();

    client.ClientCredentials.UserName.UserName = "admin";
    client.ClientCredentials.UserName.Password = "admin";

    echoStringRequest.@in = textBox2.Text;
    try
    {
        // Ignore certificate check
        ServicePointManager.ServerCertificateValidationCallback = 
          delegate (object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; };
        String response = client.echoString(echoStringRequest.@in);
        richTextBox2.Text = response;
    }
    catch (Exception ex)
    {
        richTextBox2.Text = ex.Message;
    }
}