using Microsoft.TeamFoundation.Client;
using Microsoft.TeamFoundation.VersionControl.Common;
using Microsoft.TeamFoundation.VersionControl.Client;
....
            TeamFoundationServer tfs = new TeamFoundationServer("http://TFSServer:Port/", new System.Net.NetworkCredential("sUserName", "sPassword"));
            tfs.EnsureAuthenticated();

            Workspace workspace = null;
            try
            {
                // Connect to TFS Source Control
                VersionControlServer vcs = (VersionControlServer)tfs.GetService(typeof(VersionControlServer));

                // Create a Workspace
                string repository = txtWorkspace;

                // location to check out files to:
                string workspacePath = @"" + "Folder";

                workspace = vcs.CreateWorkspace("TestWorkSpace", vcs.AuthenticatedUser);
                WorkingFolder folder = new WorkingFolder(repository, workspacePath);

                // Get Files
                workspace.CreateMapping(folder);
                workspace.Get();
            }
            catch(Exception ex)
            {
                //Exception has to be handled here
            }
            finally
            {
                // clean up the workspace for subsequent passes.
                if (workspace != null)
                    workspace.Delete();
            }