Error 25 Could not load file or assembly 'Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file s
Hi there,
I am just trying to learn AJAX at the moment and have run into a problem. I have copied over the example for cascading dropdowns and this is where I have the above error.
The error occurs in the web.config file on this line<
add assembly="Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>Can anyone advise what I need to change?
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spnz 
asp.net.ajax-discussion
13973 articles. 
1 followers.
3 Replies
1494 Views
The sample is for old ajax version.
you need to copy latest ASP.NET AJAX web.config to your projects web.config
below is my cascading code for new version for you
ASPX
<%@ Page Language="C#" AutoEventWireup="true" Codebehind="Default.aspx.cs" Inherits="CascadingDropDownDemo._Default" EnableEventValidation="false" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="sm" runat="server">
</asp:ScriptManager>
<div>
<asp:UpdatePanel ID="upMain" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddl1" runat="server" Width="275px">
</asp:DropDownList><br />
<asp:DropDownList ID="ddl2" runat="server" Width="275px">
</asp:DropDownList><br />
<asp:DropDownList ID="ddl3" runat="server" Width="275px">
</asp:DropDownList><br />
<cc1:CascadingDropDown ID="ccd1" runat="server" TargetControlID="ddl1" Category="Make"
PromptText="Please select a make" ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents">
</cc1:CascadingDropDown>
<cc1:CascadingDropDown ID="ccd2" runat="server" TargetControlID="ddl2" Category="Model"
PromptText="Please select a model" ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents"
ParentControlID="ddl1">
</cc1:CascadingDropDown>
<cc1:CascadingDropDown ID="ccd3" runat="server" TargetControlID="ddl3" Category="Color"
PromptText="Please select a color" ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents"
ParentControlID="ddl2">
</cc1:CascadingDropDown>
<asp:Button ID="btnClick" runat="server" Text="I want this car." Width="282px" OnClick="btnClick_Click" /><br />
<br />
<asp:Label ID="lblInformation" runat="server" Text="[ No sellection made yet. ]"
Width="279px"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel> </div>
</form>
</body>
</html>Code Behind
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Web.Services;
using System.Web.Services.Protocols;namespace CascadingDropDownDemo
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{}
protected void btnClick_Click(object sender, EventArgs e)
{
// Get selected values
string make = ddl1.SelectedItem.Text;
string model = ddl2.SelectedItem.Text;
string color = ddl3.SelectedItem.Text;// Output result string based on which values are specified
if (string.IsNullOrEmpty(make))
{
lblInformation.Text = "Please select a make.";
}
else if (string.IsNullOrEmpty(model))
{
lblInformation.Text = "Please select a model.";
}
else if (string.IsNullOrEmpty(color))
{
lblInformation.Text = "Please select a color.";
}
else
{
lblInformation.Text = string.Format("You have chosen a {0} {1} {2}. Nice car!", color, make, model);
}
}[WebMethod]
[System.Web.Script.Services.ScriptMethod()]
public static AjaxControlToolkit.CascadingDropDownNameValue[] GetDropDownContentsPageMethod(string knownCategoryValues, string Category)
{
CarsService cs = new CarsService();
return cs.GetDropDownContents(knownCategoryValues, Category);
}protected void ddl3_SelectedIndexChanged(object sender, EventArgs e)
{
string make = ddl1.SelectedItem.Text;
string model = ddl2.SelectedItem.Text;
string color = ddl3.SelectedItem.Text;// Output result string based on which values are specified
if (string.IsNullOrEmpty(make))
{
lblInformation.Text = "Please select a make.";
}
else if (string.IsNullOrEmpty(model))
{
lblInformation.Text = "Please select a model.";
}
else if (string.IsNullOrEmpty(color))
{
lblInformation.Text = "Please select a color.";
}
else
{
lblInformation.Text = string.Format("You have chosen a {0} {1} {2}. Nice car!", color, make, model);
}
}
}
}web services code
using System;
using System.Web;
using System.Collections;
using System.Collections.Specialized;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml;using AjaxControlToolkit.Design;
namespace CascadingDropDownDemo
{
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService()]
public class CarsService : System.Web.Services.WebService
{
// Member variables
private static XmlDocument _document;
private static object _lock = new object();
// we make these public statics just so we can call them from externally for the
// page method call
//
public static XmlDocument Document
{
get
{
lock (_lock)
{
if (_document == null)
{
// Read XML data from disk
_document = new XmlDocument();
_document.Load(HttpContext.Current.Server.MapPath("~/CarsService.xml"));
}
}
return _document;
}
}public static string[] Hierarchy
{
get
{return new string[] { "make", "model" };
}
}/// <summary>
/// Constructor to initialize members
/// </summary>
public CarsService()
{
}
/// <summary>
/// Helper web service method
/// </summary>
/// <param name="knownCategoryValues">private storage format string</param>
/// <param name="category">category of DropDownList to populate</param>
/// <returns>list of content items</returns>
[WebMethod]
public AjaxControlToolkit.CascadingDropDownNameValue[] GetDropDownContents(string knownCategoryValues, string category)
{
// Get a dictionary of known category/value pairs
StringDictionary knownCategoryValuesDictionary = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);// Perform a simple query against the data document
return AjaxControlToolkit.CascadingDropDown.QuerySimpleCascadingDropDownDocument(Document, Hierarchy, knownCategoryValuesDictionary, category);
}
}}
Good luck
James Wu (MIB426)
.NET is only way to go
MCP, MCSE, MCDBA, MCSD, MCAD
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MIB426 Hi MIB426,
Thanks heaps for your code....I am pretty new to both .NET & AJAX so I need to be a pain and ask a couple more questions.
Where can I get the web.config file from?
This part of your code (web services code) where am I meant to add this to?
Thanks heaps for your help!
using System;
using System.Web;
using System.Collections;
using System.Collections.Specialized;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml;using AjaxControlToolkit.Design;
namespace CascadingDropDownDemo
{
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService()]
public class CarsService : System.Web.Services.WebService
{
// Member variables
private static XmlDocument _document;
private static object _lock = new object();
// we make these public statics just so we can call them from externally for the
// page method call
//
public static XmlDocument Document
{
get
{
lock (_lock)
{
if (_document == null)
{
// Read XML data from disk
_document = new XmlDocument();
_document.Load(HttpContext.Current.Server.MapPath("~/CarsService.xml"));
}
}
return _document;
}
}public static string[] Hierarchy
{
get
{return new string[] { "make", "model" };
}
}/// <summary>
/// Constructor to initialize members
/// </summary>
public CarsService()
{
}
/// <summary>
/// Helper web service method
/// </summary>
/// <param name="knownCategoryValues">private storage format string</param>
/// <param name="category">category of DropDownList to populate</param>
/// <returns>list of content items</returns>
[WebMethod]
public AjaxControlToolkit.CascadingDropDownNameValue[] GetDropDownContents(string knownCategoryValues, string category)
{
// Get a dictionary of known category/value pairs
StringDictionary knownCategoryValuesDictionary = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);// Perform a simple query against the data document
return AjaxControlToolkit.CascadingDropDown.QuerySimpleCascadingDropDownDocument(Document, Hierarchy, knownCategoryValuesDictionary, category);
}
}}
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spnz Sorry its me again.
Ok I have created a new page called default2.aspx and added the above code. I created a new web service "WebService" and added the above code into WebService.cs.
When I try run the the form I get an error saying "Error 29 Could not create type 'WebService'. C:\Users\shane\Desktop\AJAXEnabledWebSite4\WebService.asmx 1"
What else do I need to change......Please help!!!!!!!
Thank you
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spnz 
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Web resources about - Error 25 Could not load file or assembly 'Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file s - asp.net.ajax-discussion