Cannot implicity convert type ‘System.Collections.Generic.List’ to ‘System.Collections.Generic.IList

Having problem on my web api “Cannot implicity convert type IQueryable<> to Generic.List”. I’m getting the data from Entity Framework.
When I put ToList() it return this error: System.Collections.Generic.List’ to ‘System.Collections.Generic.IList<LM_WebApi.Controllers.Items>

How to implement single logout using http-redirect

I am using the library ITfoxtec Identity SAML 2.0 to implement SAML 2.0 with an ASP.Net 4.6 MVC App and a 3rd party IdP that only supports http-redirect single logout. I am able to login, but I can’t get the single logout to work. The sample only use http-post to logout. Is there any sample code that is publicly available that shows how to implement a single logout using http-redirect?