I am currently running the following code to check if there is a site with a title equal to my string myname.

This code is however very time consuming because I have a large number of sites. Is there a more efficient method to test this, without using SPWeb.Exists because I am working Client Side.

using (ClientContext context = new ClientContext(spUri))
   context.Credentials = CredentialCache.DefaultNetworkCredentials;
   Web web = context.Web;
   context.Load(web, w => w.Title, w => w.Webs);
   int j = 0;

       if (web.Webs[j].Title == myname) exists = true;
   } while (!exists || j++ != web.Webs.Count);
  • 1
    Is finding your subsite by title a requirement? Can't you use the site URL ?
    – MdMazzotti
    Jan 17, 2014 at 13:41
  • Site URL would be an acceptable workaround. Jan 17, 2014 at 13:45

2 Answers 2


You can use linq query:

    var subWeb = (from w in web.Webs where w.Title == YourTitle select w).SingleOrDefault();
    if (subWeb != null)
      // if found true
      return true;

See more at: http://www.daniellewis.me.uk/2013/10/02/a-quick-way-to-check-if-a-sub-site-exists-using-the-sharepoint-2013-net-client-side-object-model-csom/#sthash.z7ebixoz.dpuf

  • 1
    I think the expensive call is the actual query to get the webs list
    – MdMazzotti
    Jan 17, 2014 at 15:04
  • 2
    You are right. He needs a way to perform it in CSOM and not server side. So he can use the sample I provided and compare it with the one he already has to see if there is any performance gain. Jan 17, 2014 at 15:09
  • Huge performance gain. Thanks a million for this! @MdMazzotti The expensive call is the do - while loop. If it's the last match has 200k iterations. Linq is much more efficient. Jan 17, 2014 at 16:17
  • @MartijnBurger thanks for the info! It can come in handy
    – MdMazzotti
    Jan 17, 2014 at 16:26

You can use the WebClient class to check if the specified URL exists. Example:

using(var client = new WebClient()) {       
        string check = client.DownloadString("http://siteroot/urlSubSiteUrl");
    catch(Exception ex){    
       //if you get here the site doesn't exist

Source and more info: stackoverflow

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