title: Override ActionFilter attribute is no working in ASP.NET Web APi 2
body: <p>I'm using ASP.NET WEB API 2 to migrate an existing web service.</p>
  
  <p>Below is set of filter that I use</p>
  
  <pre><code>public class ValidateSession : ActionFilterAttribute
  {
  
      public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)
      {
          //var requestMessage = actionContext.Request.Content.ToString();
          if (!actionContext.Request.Headers.Contains("source"))
          {
              actionContext.Request.Headers.Add("source", "1");
          }
          if (!actionContext.Request.Headers.Contains("appstore_session_id"))
          {
              actionContext.Response = actionContext.Request.CreateErrorResponse(System.Net.HttpStatusCode.BadRequest, "Session id is not included in the header");
          }
      }
  
  
  }
  </code></pre>
  
  <p>Below is the code for override the previous ActionFilter attribute</p>
  
  <pre><code>public class OverrideSessionValidation : ActionFilterAttribute, IOverrideFilter
  {
      public Type FiltersToOverride
      {
          get { return typeof(ValidateSession); }
      }
  
      public bool AllowMultiple
      {
          get { return true; }
      }
  
  
  }
  </code></pre>
  
  <p>The code for controller is also give below</p>
  
  <pre><code>[ValidateSession]
  public class SampleController : ApiController
  {
      public string GetSessionValues()
      {
          return "from session vals";
      }
      [OverrideSessionValidation]
      public string GetDefaultVals()
      {
          return "from DefVals";
      }
  }
  </code></pre>
  
  <p>It can be seen that I have placed the validate session at the class level and for one method I want to override the same. Hence for the second method I used overrideSessionValidation. Though the </p>
  
  <p>FiltersToOverride of OverrideSessionValidation is called, I see that onActionExcuting for ValidateSession is also called. I expect that the class filter onActionExecuting should not be called as I have Override for the same.</p>
  
  <p>Please let me know what is the error so that I can solve this problem</p>
  
  <p>Thanks and regards
  Venkatesh</p>