public bool TryToConnect(string userName, string password, string tfsUrl)
    {
        var tpc = new TfsTeamProjectCollection(
            new Uri(tfsUrl),
            new NetworkCredential(userName, password, "pccin"));

        try
        {
            tpc.EnsureAuthenticated();
        }
        catch (Exception)
        {
            return false;
        }
        return true;
    }

2016-02-12T13:20:35  PID[25440] Verbose     Error accessing the registry to get the display name: System.IO.IOException: The specified registry key does not exist.
   at Microsoft.Win32.RegistryKey.Win32Error(Int32 errorCode, String str)
   at Microsoft.Win32.RegistryKey.CreateSubKeyInternal(String subkey, RegistryKeyPermissionCheck permissionCheck, Object registrySecurityObj, RegistryOptions registryOptions)
   at Microsoft.Win32.RegistryKey.CreateSubKey(String subkey, RegistryKeyPermissionCheck permissionCheck)
   at Microsoft.Win32.RegistryKey.CreateSubKey(String subkey)
   at Microsoft.TeamFoundation.Common.Internal.TeamFoundationEnvironment.**OpenOrCreateRootUserRegistryKey()**
   at Microsoft.TeamFoundation.Client.RegisteredTfsConnections.OpenCurrentUser(String key, Boolean writable, Boolean shouldCreate)
   at Microsoft.TeamFoundation.Client.RegisteredTfsConnections.GetInstancesInfos(Boolean includeDeleted)
   at Microsoft.TeamFoundation.Client.RegisteredTfsConnections.GetCollectionsInternal(Boolean returnOnlyLegacyServers)
   at Microsoft.TeamFoundation.Client.RegisteredTfsConnections.GetProjectCollection(Uri uri)
   at Microsoft.TeamFoundation.Client.TfsTeamProjectCollection.get_Name()