1) How to get the Web Title in Sharepoint 2013 using CSOM.

sharePointURL = new Uri(Request.QueryString["SPHostUrl"]);

 using (var clientContext =SolutionName.TokenHelper.GetS2SClientContextWithWindowsIdentity(hostWeb, null))

{

Web oWebsite = clientContext.Web;

                clientContext.Load(clientContext.Web, web => web.Url);

                clientContext.ExecuteQuery();

               string  webURL = clientContext.Web.Url;

}