如何以编程方式将GET / POST请求发送到简单的ASPX页面？

Question

I use following code to post querystring

string URI = "http://somewebsite.com/default.aspx";
string myParameters = "param1=value1&param2=value2&param3=value3";
using (WebClient wc = new WebClient())
{
   wc.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
   string HtmlResult = wc.UploadString(URI, myParameters);
}

But somehow default.aspx does not accept that post call.

The point is when I manually in browser go to http://somewebsite.com/default.aspx all code there is working fine.

My questions is following what do I am missing here to archive the same result when I open page manually as I do it with WebClient ?

Thank you in advance!

PS 1

I just tried to use GET method to that URL and it has no effect also. How is it possible? What is difference between manual navigation to page and sending GET/POST?

PS 2

I even tried this

wc.Headers["Accept"] = "application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";
            wc.Headers["User-Agent"] = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; MDDC)";

and and Load event of Default.aspx is not hiting. :(

Answer 1

From your description of what you want to achieve, I think you may have chosen the wrong WebClient method. Instead of UploadString , try DownloadString :

using (WebClient wc = new WebClient())
{
  string HtmlResult = wc.DownloadString("http://somewebsite.com/default.aspx?param1=value1&param2=value2&param3=value3");
}

Answer 2

So that comment is correct one

"What is difference between manual navigation to page and sending GET/POST?" - see for yourself, for example using Fiddler. – CodeCaster

I checked all requests with Fiddler and found that there is code of base page class that redirects to Index page. So Load event is never happened.