C# webbrowser and HTTP COMMANDS

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C#

web_browser

I am trying to develop ServerSide application, who will accept shell commands via HTTP web panel.For this i was used WebBrowser on WindowsForm.Application. Like this

ON server side i wrote this code

WebBrowser1.Navigate("http://localhost/commander.html");
if(webbrowser1.document.contains("cmd"))
{
            process.start(@"cmd.exe")
        }
 if(webbrowser1.document.contains("calc"))
{
            process.start(@"calc.exe")
        }

This code works when on Webserver equals text like "cmd" but they execute to many cmd.exe . And Program not accepts live changes on webserver, and don't execute second command "calc.exe". I know for programms like this the best way to use TCP sockets, but my router not allow tcp connections between my and another user computer.

And web panel looks like

<pre><input type="text" id="commander" name="cmder" size="40"/>
<input type="submit" id="cmdsend" name "shellsend" />

Any ideas? Sorry for my English

What I have tried:

ServerSide application

WebBrowser1.Navigate("http://localhost/commander.html");
if(webbrowser1.document.contains("cmd"))
{
            process.start(@"cmd.exe")
        }
 if(webbrowser1.document.contains("calc"))
{
            process.start(@"calc.exe")
        }

AND WEBPANEL SIDE

<pre><input type="text" id="commander" name="cmder" size="40"/>
<input type="submit" id="cmdsend" name "shellsend" />