ASP.NET AJAX Control Toolkit

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

mr_squall — Fri, 04 Dec 2009 07:49:42 GMT

Hello! This error also may be wired with using HttpContext.Current.Session. Because this object in my case was be null.

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

MAW74656 — Tue, 14 Jul 2009 22:42:01 GMT

wazzzuup:
2)If it so vitally important, why isn't it added by default or why isn't it nowhere mentioned in FAQs, examples and so on?

I don't know why it isn't mentioned anywhere, but I do know that Visual Studio will automatically include this statement when you create a new web service. In fact, when I got a similiar error, I just created a new web service, pasted in my methods, and it worked.

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

it.architect — Tue, 14 Jul 2009 16:07:20 GMT

I had the same problem, and the only way to solve it is debuging de webservice to find where it went wrong in my case was the in the reader part

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

kalel — Sun, 26 Oct 2008 21:21:35 GMT

Hi Jeepasaurus, may you send me a sample of this try/catch code?

I dont know exactly where insert it to get the exact error back.

Thanks is advance!

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

daveblack — Wed, 16 Jul 2008 20:01:02 GMT

Please remember to "Mark as Answer" if any of these posts answered your question.

I'm glad I was able to help

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

elephantman — Wed, 16 Jul 2008 19:43:09 GMT

thanks very much the problem is solved. Also my query's fieldnames were incorrect. I corrected them too. now it works successfully :)

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

daveblack — Wed, 16 Jul 2008 17:54:24 GMT

After looking at your .config file a little more, I noticed that you add 2 different versions of the "ScriptHandlerFactory" - remove Line 3

1    <httpHandlers>
2    <remove verb="*" path="*.asmx"/>
3          <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
4          <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
5    <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
6    <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>
7    </httpHandlers>

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

daveblack — Wed, 16 Jul 2008 17:47:53 GMT

A couple of things:

You should have your SqlConnection and SqlCommand wrapped in 'using()' statements (it's a best practice to make sure the resources are cleaned up and closed)
Does your WebMethod ever get called?
If so, how many items are being returned in your CascadingDropDownNameValue[]?
Why do you remove the ScriptHandler in your web.config?
Can you confirm the version of .NET you are using?
What version of the AJAX Control Toolkit - specifically, the CascadingNameDropDown component, are you using?

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

elephantman — Tue, 15 Jul 2008 12:24:43 GMT

any idea? Please !!!

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

elephantman — Tue, 15 Jul 2008 11:08:43 GMT

I have same error. I tried everything but the problem isn't solved :( What should i do to fix the problem?

here is my webservice.cs code:

using System;
using System.Web;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Web.Services;
using System.Web.Services.Protocols;
using AjaxControlToolkit;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

/// <summary>
/// Summary description for SirketKullanicilari
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[System.Web.Script.Services.ScriptService]
public class MyWebService : System.Web.Services.WebService
{
    public MyWebService()
    { 
    
    }

    [WebMethod]
    public CascadingDropDownNameValue[] GetKullaniciBySirketId(string knownCategoryValues, string category)
    {
        string strConnString = ConfigurationManager.ConnectionStrings["TESTDBConStr"].ConnectionString;
        string[] SirketDegerleri = knownCategoryValues.Split(':',';');
        int sirketId = Convert.ToInt32(SirketDegerleri[1]);

        SqlConnection con = new SqlConnection(strConnString);
        SqlCommand sorgu = new SqlCommand("Select sirketid,SirketAdi from Kullanicilar where Sirket=@sirketid",con);
        sorgu.Parameters.AddWithValue("@sirketid",sirketId);

        SqlDataAdapter da = new SqlDataAdapter(sorgu);
        DataSet ds = new DataSet();
        da.Fill(ds);

        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
        foreach (DataRow dr in ds.Tables[0].Rows)
        {
           
            values.Add(new CascadingDropDownNameValue((string)dr["isim"],dr["id"].ToString()));
        }
        return values.ToArray();
    }

     
}

and this is my web.config code (Note: my web.config file is in main folder and my cascading codes and web service codes is in subfolder (is it make difference?))

 <configuration>
	<configSections>
		<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
			<sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
				<section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
				<sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
					<section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/>
					<section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
					<section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
					<section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/></sectionGroup>
			</sectionGroup>
		</sectionGroup>
	</configSections>
	<connectionStrings>
		<add name="TESTDBConStr" connectionString="Data Source=****;Initial Catalog=*****;User ID=****;Password=*****" providerName="System.Data.SqlClient"/>
	</connectionStrings>
	<system.web>
		
		<pages>
			<controls>
				<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
				<add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/></controls>
		</pages>
		<!--
          Set compilation debug="true" to insert debugging
          symbols into the compiled page. Because this
          affects performance, set this value to true only
          during development.
    -->
		<compilation debug="true">
			<assemblies>
				<add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
				<add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
				<add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
				<add assembly="System.Web.Extensions.Design, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
				<add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies></compilation>
		<httpHandlers>
			<remove verb="*" path="*.asmx"/>
      <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
      <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
			<add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
			<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>
		</httpHandlers>
		
		<httpModules>
			<add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
		</httpModules>
	</system.web>
  <system.web.extensions>
    <scripting>
      <webServices>
        <jsonSerialization maxJsonLength="5000000" />
      </webServices>
    </scripting>
  </system.web.extensions>
	<system.webServer>
		
		<validation validateIntegratedModeConfiguration="false"/>
		<modules>
			<remove name="ScriptModule"/><add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
		</modules>
		<handlers>
			<remove name="ScriptHandlerFactory"/>
			<remove name="ScriptHandlerFactoryAppServices"/>
			<remove name="ScriptResource"/><remove name="WebServiceHandlerFactory-Integrated"/>
			<add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
			<add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
			<add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
		</handlers>
	</system.webServer>
	<system.codedom>
		<compilers>
			<compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CSharp.CSharpCodeProvider,System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" warningLevel="4">
				<providerOption name="CompilerVersion" value="v3.5"/>
				<providerOption name="WarnAsError" value="false"/></compiler>
			<compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.VisualBasic.VBCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" warningLevel="4">
				<providerOption name="CompilerVersion" value="v3.5"/>
				<providerOption name="OptionInfer" value="true"/>
				<providerOption name="WarnAsError" value="false"/></compiler></compilers></system.codedom>
	<runtime>
		<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
			<dependentAssembly>
				<assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>
				<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/></dependentAssembly>
			<dependentAssembly>
				<assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>
				<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/></dependentAssembly></assemblyBinding></runtime></configuration>

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

daveblack — Mon, 24 Mar 2008 18:31:09 GMT

The default value of maximumJsonLength is 102400, so just make sure it is larger than that - of course unless you already have it larger than 102400.

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

arunvinoth — Fri, 11 Jan 2008 11:50:01 GMT

eureka.. eureka..

I crossed d same error & found d soln..at last

I mistakenly put one element less in 'Hierarchy ' property..

we hv to return d same no of elements as of ddls..

so no more Method error 500.. in CDD..

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

DavidWalker — Tue, 18 Dec 2007 11:24:56 GMT

yeh, adding the following to the web.config file made the difference for me :-)

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

Zebb — Tue, 16 Oct 2007 19:53:46 GMT

I had this same issue as well, for days, tried all the suggested fixes, yet nothing worked.

Finally though, after some tedious narrowig down. I discovered that in my XML file all the element names you set HAVE to be lowercase, so like <myfoobar name="foobar"> if you do <myFooBar name="foobar>" it won't work.

I had all occurances of the item throught all my files with the same capitalization and it would not work, once I lower cased everything then it worked just fine.

Hope that gives some more ideas to fix any cascading dropdown issues you are having.

Re: Cascading Dropdown Doesn't Work - Please Help Me!! - Getting [Method Error 500]

Jeepasaurus — Wed, 03 Oct 2007 21:32:51 GMT

I received this same error and could not figure it out for the life of me... but finally had some success.

When a web services experiences an error it just returns a Server 500 error. So I wrapped everything in a Try...Catch block. My catch block looked like this

        catch (Exception ex)
        {
            List values = new List();
            values.Add(new CascadingDropDownNameValue(ex.Message.ToString(), "1"));
            return values.ToArray();
        }

The web services then returned some XML... and the error message.

Unable to cast object of type 'System.Int32' to type 'System.String'. --- Oh really. My primary key is a integer. It wasn't being cast correctly. Fixed that... and bam, Web Service works.

Hope that helps.