Add An Item To A Folder To A List With CSOM

Its really similar to how you would do it with traditional server side OM means. This is a static helper method that will generate a new folder in some list. Essentially we just have to spin a ListItemCreationInformation object specified with empty properties and just set the FolderUrl.


public static ListItem AddItemInFolder(string siteUrl, string listName, string folderPath, ClientContext clientContext)
List list = clientContext.Web.Lists.GetByTitle(listName);
ListItemCreationInformation listItemCreationInformation = null;
if (!String.IsNullOrEmpty(folderPath))
listItemCreationInformation = new ListItemCreationInformation();
listItemCreationInformation.FolderUrl = String.Format(“{0}/{1}”, siteUrl, folderPath);
ListItem listItem = list.AddItem(listItemCreationInformation);
return listItem;



SharePoint And ADFS: SecurityTokenException – The issuer of the token is not a trusted issuer

This is a pretty common ADFS error, and there are all sorts of reasons that it could happen.

The stack trace will be this:


Microsoft.SharePoint.IdentityModel.SPTrustedIssuerNameRegistry.GetIssuerName(SecurityToken securityToken)

   at Microsoft.SharePoint.IdentityModel.SPPassiveIssuerNameRegistry.GetIssuerName(SecurityToken securityToken)

   at Microsoft.IdentityModel.Tokens.Saml11.Saml11SecurityTokenHandler.CreateClaims(SamlSecurityToken samlSecurityToken)

   at Microsoft.IdentityModel.Tokens.Saml11.Saml11SecurityTokenHandler.ValidateToken(SecurityToken token)

   at Microsoft.IdentityModel.Web.TokenReceiver.AuthenticateToken(SecurityToken token, Boolean ensureBearerToken, String endpointUri)

   at Microsoft.IdentityModel.Web.WSFederationAuthenticationModule.SignInWithResponseMessage(HttpRequest request)

   at Microsoft.IdentityModel.Web.WSFederationAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs args)

   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


At the end of the day though, don’t sit around and fiddle with the SharePoint trusted authorities and yada yada yada, it boils down to a certificate problem. Basically the one that was specified as the signing certificate, when exported during the ADFS setup, is either malformed (the certificate chain is incomplete) or plainwrong wrong when the trusted issuer was being built up in SharePoint ala powershell. So to get around the error follow two pretty basic steps.

  1. Verify the appropriate certificate chain is present on the SharePoint server in both the trusted root authorities as well as in the SharePoint folder within the Certificate MMC snap-in. Never ever, ever delete the self issued ones that SharePoint provisioned within that folder. You will cause a Micheal Bay-spolosion. To verify the chain, just popup open the certificate details within some interface (like, the MMC :) ) doesn’t really matter what and verify that the chain is trusted and existent.
  2. Next, verify that you actually used the right certificate when specifying the certificate path when building the System.Security.Cryptography.X509Certificates.X509Certificate2 object to pass into your SPTrustedIdentityTokenIssuer. This is pretty easy to mess up when troubleshooting if you are swapping certs all over the place.

Both of these are in place, then that error will go away. Not that another won’t popup :)