HTTP Post Question

I wrote some code in VB to send XML to a HTTP server. I am including that code below. I confess that I do not know C# but I have a customer who is asking if we would know how to do what I did in VB in C#. Below is the VB code can someone please provide the C# equivalent if it's not too involved. Thank you very much:

Code:

    Dim oWinhttp As New WinHttpRequest 
    Dim sResponse 
    
    'sXML is a string containing your XML to submit 
    With oWinhttp 
        Call .Open("POST", " https://emkt.pjm.com/emkt/xml/submit ") 
        Call .SetCredentials("your_user_name", "your_password", 0) 
        Call .SetRequestHeader("POST", "/emkt/xml/submit HTTP/1.1") 
        Call .SetRequestHeader("HOST", "emkt.pjm.com") 
        Call .SetRequestHeader("Content-Type", "text/xml") 
        Call .SetRequestHeader("Content-Length", Len(sXML)) 
        Call .SetRequestHeader("SOAPAction", "/emkt/xml/submit") 
        Call .Send(sXML) 
        'Wait for the response. 
        Call .WaitForResponse 

        'Display the response text. 
        sResponse = .ResponseText 
    End With

I don't think C# has the With keyword so something like:

Code:

    WinHttpRequest oWinhttp = new WinHttpRequest;
    String sResponse;
    
    // sXML is a string containing your XML to submit 
    oWinhttp.Open("POST", " https://emkt.pjm.com/emkt/xml/submit ");
    oWinhttp.SetCredentials("your_user_name", "your_password", 0);
    oWinhttp.SetRequestHeader("POST", "/emkt/xml/submit HTTP/1.1"); 
    oWinhttp.SetRequestHeader("HOST", "emkt.pjm.com");
    oWinhttp.SetRequestHeader("Content-Type", "text/xml");
    oWinhttp.SetRequestHeader("Content-Length", sXML.Length); 
    oWinhttp.SetRequestHeader("SOAPAction", "/emkt/xml/submit");
    oWinhttp.Send(sXML);
    // Wait for the response. 
    oWinhttp.WaitForResponse();

    // Display the response text. 
    sResponse = oWinhttp.ResponseText;

Thank you!