POST to a Cisco IP phone

Question

Hi, I am trying to make a C# web application wich will POST an xml message to a Cisco IP phone. If I create a webpage with a text editor with the following code, it works when I open it in my browser.  

<form action="http://10.5.1.168/CGI/Execute" method="POST">
    <textarea name="XML" rows="20" cols="80">
        <CiscoIPPhoneExecute>
            <ExecuteItem Priority="0" URL="http://10.1.1.15/ciscoipservices/clock/clock.asp" />;
        </CiscoIPPhoneExecute>
    </textarea>
    <br />
    <input type="submit" value="POST" />
</form>

  

Does anyone know how I can put this into C# code and send it with a webform button? Im new to C# but im sure this could be done somehow. Thanks in advance.