Avoid Loading Time While Using Repeater
Jul 26, 2010
I am using .net 3.5 framework and i am using repeater control in my application.I am using link button to display the records.Displaying 9 records in a page.Show all button is there.When i click on show all button(Result of 250 records) then the page is loading and hanging for some time anf then it is displaying the all records.I know the time taken between the server and the browser.But i need to avoid the hanging of the page and the loading time should be reduced.How to solve this issue.If the page contains 9 products then it is loaded quickly.But if it contains lot of images then it's hanged. some of my friends told to use the jquery but i have noo idea regarding jquery so can anyone give an solution for this.Till it's breaking my head.
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[Code]....
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[Code]....
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Aug 19, 2013
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?
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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.
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<asp:Repeater ID="A" runat="server"><br/>
<ItemTemplate><br/>
<h2 class="Information"><br/>
[code]...
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