How do I use slideshow extender in aaxcontroltoolkit

See more:

C#

ASP.NET

I want to create a slide show using AjjaxSlideShowExtender.
This is the first time i am trying this. i have studied some tutorials and tried but i am getting into problem every time.

my source code is as follows:

<div id="slideshow" runat="server" style="position:absolute; left:20%; width:60%; text-align:center;">
       <br />
       <asp:Label ID="TitleLabel" runat="server"></asp:Label>
       <br />
       <asp:Image ID="Image1" runat="server" Width="400px" Height="300px" />
       <asp:SlideShowExtender ID="SlideShowExtender1" runat="server" AutoPlay="true" Loop="false" PreviousButtonID="PreviousImageButton" NextButtonID="NextImageButton" PlayButtonID="StartStopImageButton" TargetControlID="Image1" PlayInterval="3000" SlideShowAnimationType="SlideRight" ImageTitleLabelID="DescriptionLabel"  ImageDescriptionLabelID="DescriptionLabel" PlayButtonText="PLAY" StopButtonText="STOP"  SlideShowServiceMethod="imgslides"></asp:SlideShowExtender>
       <br />
       <asp:Label ID="DescriptionLabel" runat="server"></asp:Label>
       <br />
       <asp:ImageButton ID="PreviousImageButton" runat="server" ImageUrl="~/Assets/leftarrow.JPG" Width="10%" />
       <asp:Button ID="StartStopImageButton" runat="server" />
       <asp:ImageButton ID="NextImageButton" runat="server" ImageUrl="~/Assets/rightarrow.JPG" Width="10%" />

   </div>

of course i have added

ToolkitScriptManage

and also registered

Assembly="AjaxControlToolkit"

on my webpage.
my code behind is as follow:

[System.Web.Services.WebMethod]
    [System.Web.Script.Services.ScriptMethod]

    
    public AjaxControlToolkit.Slide[] imgslides()
    {
        List<Slide> slides = new List<Slide>();
        string myimagedir = HttpContext.Current.Server.MapPath("~/slides/");
        DirectoryInfo dir = new DirectoryInfo("myimagedir");
        var myslides = from displaying in dir.GetFiles() select new Slide
        {
            Name = displaying.Name,
            ImagePath =  "Slides/"+ displaying.Name,
            

        };

        return myslides.ToArray();
    }

When i run this code, I get the error:

CS1935: Could not find an implementation of the query pattern for source type 'System.IO.FileInfo[]'. 'Select' not found. Are you missing a reference or a using directive for 'System.Linq'?

apparently it is provoking me to add using directive:
using System.Linq;
but when i add this, i get another error

The type or namespace name 'Linq' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)

Thus a viciou circle is created to add this directive or not.
My server has ASP.NEY 4

I have also tried using assembly reference for .NET3.5 im my config pa:

<assemblies>
<add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Xml.Linq, 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.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
</assemblies>

but it gives the same result.

What I have tried:

i have also tried another code from a tutorial. for the same source code my code behind in this case is as follows:

public AjaxControlToolkit.Slide[] imgslides()
    {
        List<Slide> slide = new List<Slide>();
        string path = HttpContext.Current.Server.MapPath("~/Slides/");
        if(path.EndsWith("\\"))
        { path = path.Remove(path.Length - 1); }
        Uri pathurl = new Uri(path, UriKind.Absolute);
        string[] files = Directory.GetFiles(path);
        foreach (string file in files)
        {
          System.Uri filepaturi = new Uri(file, UriKind.Absolute);
            slide.Add(new Slide
            {
                Name = Path.GetFileNameWithoutExtension(file),
                ImagePath = pathurl.MakeRelativeUri(filepaturi).ToString(),

            });
            
        }
            return slide.ToArray();
    }

This also gives same kind of errors as in my previous code.

I find AjaxSlideShowExtender is being extensively used on many sites. There must be some way out that i am not able to get.

Kindly help me with some code / tutorial that does not require to use Linq or some code / tutorial to get over the Linq problem so that i can use the above codes.

Many thanks for your help