Ajax toolkit call getting abort

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ASP.NET

Ajax

Ajax-toolkit

Hi..
i am using ajax toolkit to call web method.But call is getting abort.Till web method values coming while binding its getting abort.posting is happening but not getting proper response

aspx:

<asp:ScriptManager ID="ScriptManager1" runat="server EnablePageMethods="true"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
                              <ContentTemplate>
                       <asp:TextBox runat="server" ID="password" CssClass="form-control" TextMode="Password" ValidationGroup="login" />
                       <asp:RequiredFieldValidator runat="server" ControlToValidate="password" CssClass="text-danger" ErrorMessage="Passowrd is required" ValidationGroup="login" />
                         </ContentTemplate>
                   </asp:UpdatePanel>;

code behind:

WebMethod, ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = false)]
        public static List<string> Getindustrailnamebyautocomplete(string prefixText, int count)
        {
            List<string> result;
            result= UserdetailsBAL.Getindustrailnamebyautocomplete(prefixText);

            return result;
        }

What I have tried:

don't know why its getting abort