Error in using jquey.ajax

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ASP.NET

Ajax

jQuery

Hello firends,

I'm using jquery 1.6.2 in my asp.net application. every time when I'm trying to update my database using jquery.ajax() it shows me the following error.

Response:[object:object]
Status: parseerror
Text: Syntax Error: Syntax Error

This is my jquery code.

var val = $("#dpRating").val();
    $.ajax({
        type: "POST",
        url: "Media.aspx/UpdatemMethod",
        data: "{value:" + val + "}",
        contentType: "application/json",
        dataType: "json",
        success: function(data) {
            alert(data.d);
            $("#lblMsg").text("Updated");
        },
        error: function(response, status, text) {
            alert("Error \n Response:" + response + "\n Status:" + status + "\n Text:" + text);
        }
    });

Html Code

<asp:DropDownList ID="dpRating" runat="server">
  <asp:ListItem Value="0" Text="0"></asp:ListItem>
  <asp:ListItem Value="1" Text="1"></asp:ListItem>
  <asp:ListItem Value="2" Text="2"></asp:ListItem>
  <asp:ListItem Value="3" Text="3"></asp:ListItem>
  <asp:ListItem Value="4" Text="4"></asp:ListItem>
  <asp:ListItem Value="5" Text="5"></asp:ListItem>
  <asp:ListItem Value="6" Text="6"></asp:ListItem>
  <asp:ListItem Value="7" Text="7"></asp:ListItem>
  <asp:ListItem Value="8" Text="8"></asp:ListItem>
  <asp:ListItem Value="9" Text="9"></asp:ListItem>
  <asp:ListItem Value="10" Text="10"></asp:ListItem>
</asp:DropDownList>  
<input type="button" value="Submit" onclick="UpdateRating()" />

My C# Code

[System.Web.Services.WebMethod]
    public static string UpdateMethod(string value)
    {
        string res = "Entered";
        string query = string.Empty;
        if (id != null && !string.IsNullOrEmpty(area))
        {
            Media m = new Media();
            if (area == "Headers")
            {
                query = "UPDATE mytable1 SET pro='" + value + "' WHERE Id='" + id+"'";
            }
            if (area == "Contents")
            {
                query = "UPDATE mytable2 SET pro='" + value + "' WHERE id='" + id+"'";
            }
            if (!string.IsNullOrEmpty(query))
            {
                m.doQuery("",query,1);
                res = "Done";
            }
        }
        return res;
    }

Please guide me

Thanks.