Connecting to WebDAV Server Using .NET API


The WebDAV client API supports all types of authentication supported by .Net Framework: Basic, Digest, NTLM, Kerberos.

string license = "<?xml version='1.0' encoding='u...
WebDavSessionAsync session = new WebDavSessionAsync(license);
session.Credentials = new NetworkCredential("User1", "pwd");

IFolderAsync folder = null;
    folder = await session.OpenFolderAsync(new Uri("https://server/Products"));
catch (UnauthorizedException)
    Console.WriteLine("Incorrect user name or password.");
catch (NotFoundException)
    Console.WriteLine("Folder not found.");

if (folder != null)

To authenticate against Active directory accounts use:

session.Credentials = new NetworkCredential("User1", "pwd", "DOMAIN");

To utilize the username, password, and domain of the user who is currently logged in or impersonated use:

session.Credentials = CredentialCache.DefaultCredentials;

To build your own custom authentication scheme, you must implement IAuthenticationModule Interface and register it with AuthenticationManager.Register method.

Connection Limits

By default every .Net application can open only 2 connections with each domain. To open more connections simultaneously you must increase connection limit: 

ServicePointManager.DefaultConnectionLimit = 40;

Connecting Over SSL / HTTPS

If WebDAV server returns incorrect server certificate the API will throw WebDavException with a description “The underlying connection was closed: Could not establish a trust relationship for the SSL/TLS secure channel.” To avoid this exception and accept non-trusted server certificates set the ServerCertificateValidationCallback in ServicePointManager prior to calling client API methods:

using System.Net.Security;
using System.Security.Cryptography.X509Certificates;


private static bool ValidateCertificate(
    object sender,
    X509Certificate certificate,
    X509Chain chain,
    SslPolicyErrors sslPolicyErrors)
    Console.WriteLine("Issued by: " + certificate.Issuer);
    Console.WriteLine("Issued to: " + certificate.Subject);
    Console.WriteLine("Valid until: " + certificate.GetExpirationDateString());

    if (sslPolicyErrors == SslPolicyErrors.None)
        Console.WriteLine("Valid server certificate");
    return true;

ServicePointManager.ServerCertificateValidationCallback =new RemoteCertificateValidationCallback(ValidateCertificate);

WebDavSessionAsync session = new WebDavSessionAsync(license);
IFolderAsync item = await  session.OpenFolderAsync(new Uri("https://server:8080/"));

Setting Proxy Connection

WebDavSessionAsync session = new WebDavSessionAsync(license);
WebProxy proxy = new WebProxy();
proxy.Address = new Uri("http://server1:8888");
proxy.Credentials = new NetworkCredential("User1", "pwd");
session.Proxy = proxy;
IFolderAsync folder = await session.OpenFolderAsync(new Uri("http://server2:9876/"));

Next Article:

Managing Items Hierarchy on a WebDAV Server Using .NET API