Hi Guys,

I am trying to implement an edit page in order administrator to modify data in database.Unfortunately I am encountering an error.

The code below:

public ViewResult Edit(int productId) { // Do something here }

but I am getting this error:

"The parameters dictionary contains a null entry for parameter 'productId' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ViewResult Edit(Int32)' in 'WebUI.Controllers.AdminController'. To make a parameter optional its type should be either a reference type or a Nullable type.

Parameter name: parameters"

I changed my route in Global.asax.cs like this:

 routes.MapRoute(
"Admin",
"Admin/{action}/{ productId}",
new { controller = "Admin", action = "Edit",  productId= "" }

);

but still I am getting the error

Thanks for your help!

Naim