diff --git a/microsoft-ajax/microsoft.ajax-tests.ts b/microsoft-ajax/microsoft.ajax-tests.ts
index 34aa95a5a..05f993238 100644
--- a/microsoft-ajax/microsoft.ajax-tests.ts
+++ b/microsoft-ajax/microsoft.ajax-tests.ts
@@ -610,18 +610,23 @@ function Sys_WebForms_PageRequestManager_Tests() {
 
     var eventArgs = pageRequestManager.Empty;
 
-    var handler = (sender: any, args: any) => { }
+    var beginRequestHandler = (sender: any, args: Sys.WebForms.BeginRequestEventArgs) => { }
+    var endRequestHandler = (sender: any, args: Sys.WebForms.EndRequestEventArgs) => { }
+    var initializeRequestHandler = (sender: any, args: Sys.WebForms.InitializeRequestEventArgs) => { }
+    var pageLoadedRequestHandler = (sender: any, args: Sys.WebForms.PageLoadedEventArgs) => { }
+    var pageLoadingRequestHandler = (sender: any, args: Sys.WebForms.PageLoadingEventArgs) => { }
+
 
     var isInAsyncPostBack = pageRequestManager.get_isInAsyncPostBack();
     
-    pageRequestManager.add_beginRequest(handler);
-    pageRequestManager.add_endRequest(handler);
-    pageRequestManager.add_initializeRequest(handler);
-    pageRequestManager.add_pageLoading(handler);
-    pageRequestManager.add_pageLoaded(handler);
-    pageRequestManager.remove_beginRequest(handler);
-    pageRequestManager.remove_pageLoaded(handler);
-    pageRequestManager.remove_pageLoading(handler);
+    pageRequestManager.add_beginRequest(beginRequestHandler);
+    pageRequestManager.add_endRequest(endRequestHandler);
+    pageRequestManager.add_initializeRequest(initializeRequestHandler);
+    pageRequestManager.add_pageLoading(pageLoadingRequestHandler);
+    pageRequestManager.add_pageLoaded(pageLoadedRequestHandler);
+    pageRequestManager.remove_beginRequest(beginRequestHandler);
+    pageRequestManager.remove_pageLoaded(pageLoadedRequestHandler);
+    pageRequestManager.remove_pageLoading(pageLoadingRequestHandler);
     pageRequestManager.beginAsyncPostBack();
     pageRequestManager.abortPostBack();
     pageRequestManager.dispose();
diff --git a/microsoft-ajax/microsoft.ajax.d.ts b/microsoft-ajax/microsoft.ajax.d.ts
index ccd30afe9..6b765e565 100644
--- a/microsoft-ajax/microsoft.ajax.d.ts
+++ b/microsoft-ajax/microsoft.ajax.d.ts
@@ -3853,7 +3853,7 @@ declare module Sys {
             * @param beginRequestHandler
             *               The name of the handler method that will be called.
             */
-            add_beginRequest(beginRequestHandler: (sender: any, args: any) => void): void;
+            add_beginRequest(beginRequestHandler: (sender: any, args: BeginRequestEventArgs) => void): void;
             /**
             * Raised before the processing of an asynchronous postback starts and the postback request is sent to the server.
             *  @param beginRequestHandler
@@ -3877,37 +3877,37 @@ declare module Sys {
             * @param initializeRequestHandler
             *               The name of the handler method that will be called.
             */
-            add_initializeRequest(initializeRequestHandler: (sender: any, args: any) => void): void;
+            add_initializeRequest(initializeRequestHandler: (sender: any, args: InitializeRequestEventArgs) => void): void;
             /**
             * Raised during the initialization of the asynchronous postback.
             * @param initializeRequestHandler
             *               The name of the handler method that will be called.
             */
-            remove_initializeRequest(initializeRequestHandler: (sender: any, args: any) => void): void;
+            remove_initializeRequest(initializeRequestHandler: (sender: any, args: InitializeRequestEventArgs) => void): void;
             /**
             * Raised after all content on the page is refreshed as a result of either a synchronous or an asynchronous postback.
             * @param pageLoadedHandler
             *               The name of the handler method that will be called.
             */
-            add_pageLoaded(pageLoadedHandler: (sender: any, args: any) => void): void;
+            add_pageLoaded(pageLoadedHandler: (sender: any, args: PageLoadedEventArgs) => void): void;
             /**
             * Raised after all content on the page is refreshed as a result of either a synchronous or an asynchronous postback.
             * @param pageLoadedHandler
             *               The name of the handler method that will be called.
             */
-            remove_pageLoaded(pageLoadedHandler: (sender: any, args: any) => void): void;
+            remove_pageLoaded(pageLoadedHandler: (sender: any, args: PageLoadedEventArgs) => void): void;
             /**
             * Raised after the response from the server to an asynchronous postback is received but before any content on the page is updated.
             * @param pageLoadedHandler
             *               The name of the handler method that will be called.
             */
-            add_pageLoading(pageLoadingHandler: (sender: any, args: any) => void): void;
+            add_pageLoading(pageLoadingHandler: (sender: any, args: PageLoadingEventArgs) => void): void;
             /**
             * Raised after the response from the server to an asynchronous postback is received but before any content on the page is updated.
             * @param pageLoadedHandler
             *               The name of the handler method that will be called.
             */
-            remove_pageLoading(pageLoadingHandler: (sender: any, args: any) => void): void;
+            remove_pageLoading(pageLoadingHandler: (sender: any, args: PageLoadingEventArgs) => void): void;
 
             //#endregion