how to access http url using password & username of tht urlinstead of DefaultCredentials.

[gujarsachin2001]

hello friends
i m connecting to http or https url programatically through console
application using follwoing methods of credentilas but if there is
username & password for that url through this code I m able to download
files from that url using "DefaultCredentials" but i want to use
password and username to access resources if tht url contains. & if for
tht specific url if user enters wrong username & password so tht he
must not able to acess tht files from tht url.
WebRequest request = WebRequest.Create(sourceurl);
request.Credentials=CredentialCache.DefaultCredent ials;

so is thrre any method to replace "DefaultCredentials" & I can use
password & usename of tht url so my application will be more safe.

thanks,
Sachin