c# - Stuck with httpwebrequest usage -

i bit confused in using httpwebrequest. tried articles not able doing first time. below code trying work on , have few questions,

a) aspx page has few controls defined , in code-behind create few controls. when httpwebrequest post, need consider controls , values? need post 1 of controls only. can control?

b) url should specified in "(httpwebrequest)webrequest.create"? assume same page shown user. example in example below ("http://localhost/myidentity/confirm.aspx?id=new&designer=true&colors=yes");

c) there else need modify or take care of either in markup or code achieve httpwebrequest?

    private void onpostinfoclick(object sender, system.eventargs e) {     asciiencoding encoding = new asciiencoding();     string postdata =  ""; //read stored array , print each element array loop here.      byte[] data = encoding.getbytes(postdata);      // prepare web request...     httpwebrequest myrequest =       (httpwebrequest)webrequest.create("http://localhost/myidentity/confirm.aspx?id=new&designer=true&colors=yes");     myrequest.method = "post";     myrequest.contenttype = "application/x-www-form-urlencoded";     myrequest.contentlength = data.length;     stream newstream = myrequest.getrequeststream();     // send data.     newstream.write(data, 0, data.length);     newstream.close(); } 

you typically use server-to-server communication (not page page data transfer).

if i'm understanding post , question correctly, seem want send post data other page in asp.net application. if so, 1 way can change postbackurl of submit button (form target) instead of normal postback (to same page).

there other ways, should simplest.

<asp:button id="button1" runat="server" text="button" postbackurl="foo.aspx" /> 

in above, instead of posting itself, post sent foo.aspx can examine/use/process posted data.

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update based on comment:

you don't have code way through httpwebrequest that. normal asp.net webforms model you.

given simple asp.net web forms page:

<form id="form1" runat="server">  coffee preference: <asp:radiobuttonlist id="coffeeselections" runat="server" repeatlayout="flow" repeatdirection="horizontal">    <asp:listitem>latte</asp:listitem>    <asp:listitem>americano</asp:listitem>    <asp:listitem>capuccino</asp:listitem>    <asp:listitem>espresso</asp:listitem> </asp:radiobuttonlist>  <asp:button id="button1" runat="server" text="button" onclick="button1_click" />  .... </form> 

your inline or code behind this:

protected void page_load(object sender, eventargs e) {    //do whatever want on page_load }   protected void button1_click(object sender, eventargs e) {    //handle button event    string _foo = coffeeselections.selectedvalue;    ... }