query string in asp.net c#

**************URL Sending & QreryString Accepting Process******

******************* ( At Same Session)****************************

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On cs Page:---->
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Response.Redirect("Registration.aspx?loginid=" + userid + "&leg=" + leg + "", false);

Response.Redirect("Registration.aspx?UserId=" + userid , false);

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On Master Page:---->
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<li><a href="../Admin/Tree.aspx?ID=PWS1000001">Geneology</a></li>


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On cs File:---->
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string str = Request.QueryString["ID"].ToString();


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On pre cs File:---->
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Response.Redirect("~/Admin/DownLineReport.aspx?id=" + id + "&plan=" + plan);

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On post cs File:---->
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 uid = Request.QueryString["id"];
 plan=Request.QueryString["plan"];


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 On .aspx    =========>
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<h3><a class="pod" href ="AccountLogin.aspx?typ=ft"><span class="style2">Customer Login</span></h3>
                     

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 On .cs   =========>
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  string type = Request.QueryString["typ"].ToString();

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