Changing the WebGrid default sort to descending in ASP.NET MVC

I was facing the problem of changing the default sort order of WebGrid in ASP.NET MVC. Here is the solutions.

   WebGrid grid = new WebGrid(Model, canPage :true, canSort:true, rowsPerPage : 50, defaultSort: "AutoId");
    grid.SortDirection = SortDirection.Descending; 

Thanks