ASP.NET Upload size limit

I tried to modify the upload size limit in the project's Web.config Adding the lines:

<system.web>

<httpRuntime 
  maxRequestLength="512000"
  executionTimeout="3600"
/>
  ...

</system.web>

 <system.webServer>
 ...
<security>
  <requestFiltering>
      <requestLimits maxAllowedContentLength="15728640" />
  </requestFiltering>
</security>

Like I found in most places. But when I try to upload it still doesn't work. When I try to upload it gives me the following error:

Server Error in '/' Application. Maximum request length exceeded. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Maximum request length exceeded.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[HttpException (0x80004005): Maximum request length exceeded.]
System.Web.HttpRequest.GetEntireRawContent() +9904940
System.Web.HttpRequest.GetMultipartContent() +63
System.Web.HttpRequest.FillInFormCollection() +160
System.Web.HttpRequest.EnsureForm() +69
System.Web.HttpRequest.get_Form() +13
System.Web.HttpRequestWrapper.get_Form() +14
System.Web.Mvc.HttpRequestExtensions.GetHttpMethodOverride(HttpRequestBase request) +121
System.Web.Mvc.AcceptVerbsAttribute.IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo) +37
System.Web.Mvc.HttpPostAttribute.IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo) +39
System.Web.Mvc.ActionMethodSelectorBase.IsValidMethodSelector(ReadOnlyCollection1 attributes, ControllerContext controllerContext, MethodInfo method) +54 System.Web.Mvc.ActionMethodSelectorBase.RunSelectionFilters(ControllerContext controllerContext, List1 methodInfos) +118
System.Web.Mvc.ActionMethodSelectorBase.FindActionMethods(ControllerContext controllerContext, String actionName) +166
System.Web.Mvc.ActionMethodSelectorBase.FindActionMethod(ControllerContext controllerContext, String actionName) +31
System.Web.Mvc.Async.ReflectedAsyncControllerDescriptor.FindAction(ControllerContext controllerContext, String actionName) +54
System.Web.Mvc.ControllerActionInvoker.FindAction(ControllerContext controllerContext, ControllerDescriptor controllerDescriptor, String actionName) +203
System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +136
System.Web.Mvc.Controller.b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState) +25
System.Web.Mvc.Async.WrappedAsyncVoid1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
System.Web.Mvc.Async.WrappedAsyncResultBase1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +465
System.Web.Mvc.Controller.b__14(AsyncCallback asyncCallback, Object callbackState, Controller controller) +18
System.Web.Mvc.Async.WrappedAsyncVoid1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +20
System.Web.Mvc.Async.WrappedAsyncResultBase1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +374
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +16
System.Web.Mvc.MvcHandler.b__4(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState) +52 System.Web.Mvc.Async.WrappedAsyncVoid1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
System.Web.Mvc.Async.WrappedAsyncResultBase1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +384
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +48
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +16
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +103 System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +48 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +159