Accessing Webservice from HttpWebRequest

I am using the below code to access the webservice in my vbscript. When it executes popup screen appears for me to enter username and password.

Set mHTTP = New MSXML2.XMLHTTP
mHTTP.Open "GET", WebseriveURL, False, "<CURRENT_USER>"
mHTTP.send

The same code i would like to convert in dotnet Csharp, i have written a below code but not able to get the popup message screen to input the username and password whereas i get 401 not authorized error

System.Net.HttpWebRequest wReq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(WebserviceURL);
wReq.Method = "GET
System.Net.HttpWebResponse wr = (System.Net.HttpWebResponse)wReq.GetResponse();

Please help me to get the popup in dotnet