异步调用传值

 $.ajax({
                type: "post",
                url: "ProviderInfoLook.aspx",
                data: {"index":index},
                datatype: "text",
                success: function(data) {
                    alert(data.d+"成功");
                },
                error: function(XMLHttpRequest, textStatus, errorThrown) {
                    alert("操作有误！请联系管理员！");
                }
            });

.cs文件 　　

　　string index = Request.Form["index"];               

　　　　　　switch (index)
                {
                    case "2": MVChange.ActiveViewIndex = 1; break;

                    case "1": MVChange.ActiveViewIndex = 0;  break;
                }