MVC Web Grid using Dynamic Data Table

DataTable dt = (DataTable) Session["dtResult"];
List < WebGridColumn > columns = new List < WebGridColumn > ();
foreach(DataColumn col in dt.Columns)
{
    columns.Add(new WebGridColumn()
    {
        ColumnName = col.ColumnName, Header = col.ColumnName
    });
}
columns.Add(new WebGridColumn()
{
    Format = (item) =>
    {
        return new HtmlString(string.Format("<a href= {0}>Edit</a>", Url.Action("Edit", "Home", new
        {
            Id = item.SSN
        })));
    }
});
ViewBag.Columns = columns;
//Converting datatable to dynamic list
var dns = new List < dynamic > ();
dns = ConvertDtToList(dt);
ViewBag.Total = dns;

public List<dynamic> ConvertDtToList(DataTable dt)
{
   var data = new List<dynamic>();
   foreach (var item in dt.AsEnumerable())
   {
      // Expando objects are IDictionary<string, object>
      IDictionary<string, object> dn = new ExpandoObject();

      foreach (var column in dt.Columns.Cast<DataColumn>())
      {
         dn[column.ColumnName] = item[column];
      }

      data.Add(dn);
   }
   return data;
}

@grid.GetHtml( columns: ViewBag.Columns,tableStyle: "table", footerStyle: "foot")