VS 2012 - Loading Images Into Repeater Control

I'm creating a simple CMS for a fairly simple web page. I'm currently working on a part for displaying news on the main page.

The controls I have on the page:

- a GridView control with enabled pagging and a SELECT button,
- an Image control for displaying news cover picture,
- CKeditor control for editing news text,
- Repeater control for displaying pictures from database

How does it all work?

In Page_load I have the following:

vb.net Code:
connectionString = "Data Source=KORISNIK-PCSQLEXPRESS;Initial Catalog=****;
User ID=**;Password=****"        conn = New SqlConnection(connectionString)       
If conn.State = ConnectionState.Closed Or conn.State = ConnectionState.Broken Then             
Try                conn.Open()                If Not IsPostBack Then                    bindGrid()                   

[Code] ...

As you can see, I load the GridView control with news from DB. At this moment all other control are disabled. User has to SELECT the row he wants to edit, and click the MODIFY button.

This is what happens when user clicks the MODIFY button:

vb.net Code:
Private Function selectForEdit()        dsSelectForEdit = New DataSet       
captionPicture.ImageUrl = ""         enableCommands()       
Dim sqlQuery As String        
sqlQuery = "SELECT news.newsCaption, news.newsIntro, news.newsCoverPicture, news.newsStatus,

[Code] ....

Basically, I select newsDetails based on newsID. Also, this is where I take the coverPicture from the database using a generic handler.

This is the code for showImage.ashx:

vb.net Code:
Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest        
Dim newsID As Int32        If Not context.Request.QueryString("newsID") Is Nothing Then           
newsID = Convert.ToInt32(context.Request.QueryString("newsID"))        Else           
Throw New ArgumentException("No parameter specified")        End If        

[Code] ....

This part works fine, as the picture is correctly displayed in the Image control. Now, I also want to load the pictures that are related to the selected news. So, I use this function:

vb.net Code:
Private Function selectNewsPictures()        dsSelectPicturesForEdit = New DataSet         enableCommands()       
Dim sqlQuery As String         sqlQuery = "SELECT newsDetailsPictureID,newsDetailsPicture,newsDetailsPictureCaption,newsDetailsPictureDescription FROM newsDetailsPictures WHERE newsID = @newsIDEditing"          myCommand = New SqlCommand(sqlQuery, conn)         myCommand.Parameters.Add("@newsIDEditing", SqlDbType.Int, 250)       

[Code] ....

You can see that I take pictureID's and store them into a List (of integer). That way I can use those integers in showNewsPictures.ashx to display all the pictures.

showNewsPictures.ashx:

vb.net Code:
Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest        
Dim newsID As Int32        If Not context.Request.QueryString("pictureID") Is Nothing Then           
newsID = Convert.ToInt32(context.Request.QueryString("pictureID"))        Else           
Throw New ArgumentException("No parameter specified")        End If        

[Code] ....

The picture ID's are being sent through pictureRepeater_ItemDataBound:

vb.net Code:
Private Sub pictureRepeater_ItemDataBound(sender As Object, e As RepeaterItemEventArgs)
Handles pictureRepeater.ItemDataBound        
If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then            
Dim ctrl As New Image            ctrl = e.Item.FindControl("pictureHolder")           
ctrl.Width = 100            ctrl.Height = 100              ctrl.ImageUrl = "~/showNewsPictures.ashx?pictureID=" &
listOfIDs.Item(itemIndex)            itemIndex = itemIndex + 1         End If    End Sub

THE PROBLEM:

I load the page, select the news, click the MODIFY button and all works well. The news details are loaded, the cover picture is loaded, the repeater pictures are loaded.

I click the cancel button (clears all the commands and disables them) and I get an error saying the DataReader needs to be closed.And I never use one This happens either in showNewsPictures.ashx or showImage.ashx.

In some other scenario, this happens right after I click the MODIFY button.