File Not Found. in ClientContext.Site.OpenWeb

Question

I just tring to open the subsite using the CSOM. I'm geting the below error in clientContext.ExecuteQuery(). site URL is https://xxxxxxxx.sharepoint.com/Customer Orders

File Not Found.

        cTokenHelper.TrustAllCertificates();
            clientContext = TokenHelper.GetClientContextWithAccessToken(SPHostUrl, accessToken);
        Uri oUri = new Uri(SiteUrl);
        oWebsite = clientContext.Site.OpenWeb(oUri.AbsolutePath);
        clientContext.Load(oWebsite);
        clientContext.ExecuteQuery();

Answer 1

From MSDN

Parameters strUrlType: System.String

Specifies the server-relative URL or web-relative URL of the site to open. If strurl is empty, the top-level site must be opened.

So what you need to pass as a parameter to OpenWeb is the relative URL. Instead of "https://xxxxxxxx.sharepoint.com/Customer Orders" it is just "Customer Orders"