how use http URLRequest by c#

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C#

VB

ASP.NET

Javascript

I am working in ASP.Net Project and sometimes we are using this code to send data.

Javascript
{
    var TrxId = window.document.getElementById('hdnContractID').value ;
    
    window.open('../TemplateViewer.aspx?ContractId='+TrxId + '&intSubModuleId=1', 'new','width=585,height=489,top=190,left=300,status=yes,scrollbars=yes','true');

}

We read this value By VB.Net

VB
{
    dim x as string 
    x=Request("ContractId")
}

When I clicked F12 in Request()
>>>>>>> to
Request() As System.Web.HttpRequest

System.Web.UI.Page.Request


How can I read value in c#?

TemplateViewer.aspx?ContractId=5

As VB please.