c# - Passing Two Optional parameter to RedirectToRoute -

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i passing 2 nullable parameters products action. forced pass value in mallid, otherwise no route table matches found error. want pass null in mallid , receive in products action. 

return redirecttoroute("products",                       new                       {                              mallid =(int32?)null,                           storeid =(int32?)storeproducts.storeid                       });   [route("mall/{mallid?}/store/{storeid?}/products", name = "products")] public actionresult products(string mallid, long? storeid) {     return view(products); }

attribute routing cracking head great too. 

[route("mall/{mallid?}/store/{storeid?}/products", name = "products")] public actionresult products(string mallid = null, long? storeid) {     return view(products); }

and don't pass in value mallid


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