GridView Paging using ASP.NET AJAX Slider Extender

Posted by: Suprotim Agarwal , on 10/23/2008, in Category ASP.NET AJAX
Views: 162471
Abstract: In this article, we will explore how to implement paging in an ASP.NET GridView using an ASP.NET AJAX Slider Extender.
GridView Paging using ASP.NET AJAX Slider Extender
As given in the ASP.NET AJAX Toolkit documentation “The Slider extender allows to upgrade an asp:TextBox to a graphical slider that allows the user to choose a numeric value from a finite range.” In this article, we will explore how to implement paging in an ASP.NET GridView using an ASP.NET AJAX SliderExtender.
Note: I am using Visual Studio 2008 and thereby utilizing the ASP.NET AJAX plumbing that comes along with it.
Let us get started with a Step-by-Step approach to do so. Viewers, who have prior experience in configuring the SqlDataSource, can jump directly to Step 5:
Step 1: Open VS 2008. Click File > New > Website. Choose ASP.NET Website from the list of installed template, choose target platform as .NET Framework 3.5, choose the desired language and enter the location where you would like to store the website on your FileSystem. I have created a folder called VS2008 Projects, so the location over here is C:\VS2008 Projects\ GridViewPaginUsingSliderExtender. After typing the location, click OK.
Step 2: Open Default.aspx. Switch to the Design mode of Default.aspx. Open the toolbox (Ctrl+Alt+X) > Data Tab > Drag and drop a SqlDataSource control on to the form. Click on the smart tag or right click SqlDataSource > Show Smart Tag > ‘Configure Data Source’ wizard. Click on ‘New Connection’ to open the ‘Add Connection’. Type your ‘Server Name’ and ‘Select a database Name’ to connect to. Over here, I have used (local) as the ‘ServerName’ and the database I am connecting to, is Northwind. Click on ‘Test Connection’ to make sure that there are no errors while connecting to the server. Click Ok.
Step 3: In the ‘Configure Data Source’, click ‘Next’. An option will be displayed to save the connection string to the configuration file. Select the checkbox ‘Yes, save this connection as:’, type a name for the connectionstring ‘NorthwindConnectionString’ and click Next.
Step 4: In the ‘Configure Select Statement’ > select ‘Specify Columns from Tables or Views’ radiobutton > Select ‘Alphabetical list of products’ View in the Name and choose ProductID, ProductName, QuantityPerUnit, UnitPrice, UnitsInStock and CategoryName. Click Next > ‘Test Query’ to preview data > click Finish. The wizard adds a SqlDataSource control to the page as shown below.
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
    ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
    SelectCommand="SELECT [ProductID], [ProductName], [QuantityPerUnit], [UnitPrice], [UnitsInStock], [CategoryName] FROM [Alphabetical list of products]">
If you check your web.config, the connection string is added as shown below:
      <add name="NorthwindConnectionString" connectionString="Data Source=(local);Initial Catalog=Northwind;Integrated Security=True" providerName="System.Data.SqlClient"/>
Step 5: Now add a <ScriptManager> control to the page and then an <UpdatePanel>. Inside the <UpdatePanel>, add a GridView(GridView1) control, set the data source property of the GridView to the 'SqlDataSource1' and ‘AutoGenerateColumns’ property to false. After defining the columns on the GridView, the markup will look similar to the following:
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
<asp:UpdatePanel ID="UpdPanel1" runat="server">
<asp:GridView ID="GridView1" runat="server" AllowPaging="true" AutoGenerateColumns="false"
DataKeyNames="ProductID" DataSourceID="SqlDataSource1"
    <asp:BoundField DataField="ProductName" HeaderText="ProductName" ReadOnly="true" SortExpression="ProductName" />
    <asp:BoundField DataField="QuantityPerUnit" HeaderText="Qty" ReadOnly="true" SortExpression="QuantityPerUnit" />
    <asp:BoundField DataField="UnitPrice" HeaderText="PricePerUnit" ReadOnly="true" SortExpression="UnitPrice" />
    <asp:BoundField DataField="UnitsInStock" HeaderText="StockQty" ReadOnly="true" SortExpression="UnitsInStock" />
    <asp:BoundField DataField="CategoryName" HeaderText="Category" ReadOnly="true" SortExpression="CategoryName" />
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
SelectCommand="SELECT [ProductID], [ProductName], [QuantityPerUnit], [UnitPrice], [UnitsInStock], [CategoryName] FROM [Alphabetical list of products]">
I have also added some css to enhance the UI of the GridView
<head runat="server">
<title>How to page a GridView Using an ASP.NET AJAX Slider Extender</title>
<style type="text/css">
font: normal 11px auto "Trebuchet MS", Verdana, Arial, Helvetica, sans-serif;   
background-color: #ffffff;
color: #4f6b72;      
th {
font: bold 11px "Trebuchet MS", Verdana, Arial, Helvetica, sans-serif;
color: #4f6b72;
border-right: 1px solid #C1DAD7;
border-bottom: 1px solid #C1DAD7;
border-top: 1px solid #C1DAD7;
letter-spacing: 2px;
text-transform: uppercase;
text-align: left;
padding: 6px 6px 6px 12px;
background: #D5EDEF;
td {
border-right: 1px solid #C1DAD7;
border-bottom: 1px solid #C1DAD7;
background: #fff;
padding: 6px 6px 6px 12px;
color: #4f6b72;
background: #F5FAFA;
color: #797268;
font: bold 13px "Trebuchet MS", Verdana, Arial, Helvetica, sans-serif;
background: #D5EDEF;
color: #797268;
Step 6: Now declare a <PagerTemplate> inside the GridView and add a SliderExtender(ajaxSlider) from the toolbox (ASP.NET AJAX toolkit), a TextBox(txtSlide) and a Label(lblPage) control. Bind the ‘Text’ property of the ‘txtSlide’ using an expression. The lblPage will display the status of the current page as the user uses the Slider to do paging. The binding expressions will look similar to the ones shown below:
    <asp:TextBox ID="txtSlide" runat="server" Text='<%# GridView1.PageIndex + 1 %>'  AutoPostBack="true" OnTextChanged="txtSlide_Changed"/>              
    <cc1:SliderExtender ID="ajaxSlider" runat="server"
    TargetControlID="txtSlide"    Orientation="Horizontal"                                    
    <asp:Label ID="lblPage" runat="server" Text='<%# "Page " + (GridView1.PageIndex + 1) + " of " + GridView1.PageCount %>' />
The SliderExtender uses its ‘TargetControlID’ ‘txtSlide’ to store its position state. We will add code to the ‘txtSlide_Changed’ event handler in just a moment.
VB.NET users should replace ‘+’ with ‘&’
 <asp:Label ID="lblPage" runat="server" Text='<%# "Page " & (GridView1.PageIndex + 1) & " of " & GridView1.PageCount %>' />
Step 7: The last step is to set the SliderExtender properties in the ‘GridView_DataBound’ event and set the GridView PageIndex programmatically in the ‘txtSlide_Changed’ event.
Add the GridView_DataBound event handler
<asp:GridView ID="GridView1" runat="server" AllowPaging="true" AutoGenerateColumns="false"
DataKeyNames="ProductID" DataSourceID="SqlDataSource1"
and in the codebehind, write the following code:
protected void txtSlide_Changed(object sender, EventArgs e)
    TextBox txtCurrentPage = sender as TextBox;
    GridViewRow rowPager = GridView1.BottomPagerRow;
    TextBox txtSliderExt = (TextBox)rowPager.Cells[0].FindControl("txtSlide");
    GridView1.PageIndex = Int32.Parse(txtSliderExt.Text) - 1;       
protected void GridView1_DataBound(object sender, EventArgs e)
    GridViewRow rowPager = GridView1.BottomPagerRow;
    SliderExtender slide = (SliderExtender)rowPager.Cells[0].FindControl("ajaxSlider");
    slide.Minimum = 1;
    slide.Maximum = GridView1.PageCount;
    slide.Steps = GridView1.PageCount;
Protected Sub txtSlide_Changed(ByVal sender As Object, ByVal e As EventArgs)
      Dim txtCurrentPage As TextBox = TryCast(sender, TextBox)
      Dim rowPager As GridViewRow = GridView1.BottomPagerRow
      Dim txtSliderExt As TextBox = CType(rowPager.Cells(0).FindControl("txtSlide"), TextBox)
      GridView1.PageIndex = Int32.Parse(txtSliderExt.Text) - 1
End Sub
Protected Sub GridView1_DataBound(ByVal sender As Object, ByVal e As EventArgs)
      Dim rowPager As GridViewRow = GridView1.BottomPagerRow
      Dim slide As SliderExtender = CType(rowPager.Cells(0).FindControl("ajaxSlider"), SliderExtender)
      slide.Minimum = 1
      slide.Maximum = GridView1.PageCount
      slide.Steps = GridView1.PageCount
End Sub
In the txtSlide_Changed event, the code first uses the ‘Find()’ method of the GridViewRow cells to find the txtSlide control. The ‘PageIndex’ of the GridView is then set to the value of the txtSlide.
The GridView_DataBound sets various properties on the SliderExtender. The slide.Maximum is the maximum value for the slider extender control position; in our case is the GridView.PageCount. The slide.Minimum is the minimum value for the slider control position.  The Steps property represents the number of discrete values in the Slider.
Note 1: Instead of setting the values in the GridView_DataBound event, you can also set the properties directly in the SliderExtender as shown by Vince Xu of the ASP.NET Forums
<cc1:SliderExtender ID="ajaxSlider" runat="server"
    Steps='<%# GridView1.PageCount %>'
    Maximum='<%# ((GridView)Container.NamingContainer).PageCount %>'                                   
Note 2: If you are wondering why the paging occurs only on MouseUp, then this is due to the ‘RaiseChangeOnlyOnMouseUp’ property of the SliderExtender. It’s a good practice to set the value of this property to true to avoid async postbacks to occur each time the slider value changes.
Run the application and you can now perform pagination using the ASP.NET AJAX SliderExtender control as shown below:
Grid View Slider
If you plan to implement paging using a SliderExtender in a ListView instead of a GridView, check out Matt Berseth’s article Data Navigation with the ListView, DataPager and SliderExtender Controls. I hope this article was useful and I thank you for viewing it. The source code of the article can be downloaded from here.

This article has been editorially reviewed by Suprotim Agarwal.

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Suprotim Agarwal, MCSD, MCAD, MCDBA, MCSE, is the founder of DotNetCurry, DNC Magazine for Developers, SQLServerCurry and DevCurry. He has also authored a couple of books 51 Recipes using jQuery with ASP.NET Controls and The Absolutely Awesome jQuery CookBook.

Suprotim has received the prestigious Microsoft MVP award for Sixteen consecutive years. In a professional capacity, he is the CEO of A2Z Knowledge Visuals Pvt Ltd, a digital group that offers Digital Marketing and Branding services to businesses, both in a start-up and enterprise environment.

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Feedback - Leave us some adulation, criticism and everything in between!
Comment posted by somalinga raju on Wednesday, October 29, 2008 9:40 PM
it is very useful for me. thanx
Comment posted by shady83 on Monday, December 1, 2008 10:04 AM
the code is empty how can i get it ?
Comment posted by Suprotim Agarwal on Tuesday, December 2, 2008 10:08 PM
shady83: Apologies. The link has been fixed.
Comment posted by ravi4dotnet on Thursday, December 11, 2008 12:51 AM
Hi. Its very nice aritcal. and i liked it. and i used in my application . thank you very much .
Comment posted by *aeed* on Thursday, December 18, 2008 9:34 PM
thank you. Bbest actical
Comment posted by lumifi on Tuesday, May 19, 2009 2:18 PM
Hi. When I try to config the pager position on Top, the slider won't work. Clicking on the slider cause the IE to scroll down the page. In Firefox it's working fine. Any sugestions?
Comment posted by on Saturday, August 15, 2009 5:13 PM
it's good article but how can i download code for this. i have been registered also.
Comment posted by on Saturday, August 15, 2009 5:14 PM
plz help me out in this.
Comment posted by Admin on Sunday, August 16, 2009 11:19 PM
The code can be downloaded using the link given in the article- See last para. If you are a registered user or Newsletter Subscribe, the password has been emailed to you.
Comment posted by chaitanyan on Wednesday, August 26, 2009 8:58 AM
Password for this article
Comment posted by Shaik yousuf shareef on Saturday, January 16, 2010 4:51 AM
Suprotim Agarwal

nice post it was very useful to me

bye please posting more articles
Comment posted by syedi on Monday, February 8, 2010 9:42 AM
In my case when i slides to next page, slider is sliding back to initial position and only first page is shown, Please help...
Comment posted by Manish on Monday, April 26, 2010 2:33 AM
It is showing error in SliderExtender in css file. it is comming with red underline.

I think it need the namespace file.

please resolve my problem it is urgent
Comment posted by Rahul on Sunday, May 9, 2010 5:16 PM
Thanks for the tutorial but it's not working for me. I am not able to get the paging in the gridview, I am binding my gridview from code behind instead of sql data source.

Please help
Comment posted by Atul Kumar Singhal on Saturday, June 26, 2010 5:54 AM
Thanks, for this tutorial. It is working. This is a good job.
Comment posted by chandan on Friday, March 4, 2011 3:58 AM
Comment posted by soumya ranjan pradhan on Wednesday, April 6, 2011 2:02 PM
thnx for sharing ur knowledge,...that's really appreciable............

good work...
Comment posted by Ashish Pandey on Wednesday, January 4, 2012 2:50 AM

I was reading your article and I would like to appreciate you for making it very simple and understandable. This article gives me a basic idea of Ajax Toolkit SliderExtender Control in ASP.Net and it helped me a lot. Thanks for sharing with us. Check out this helpful link too its also having nice post with wonderful explanation on Ajax Toolkit SliderExtender Control in ASP.Net....

Thank you very much!
Comment posted by hannah on Thursday, March 27, 2014 6:30 AM
it will not work on my aspx page. it brings a text area where i have to keyin the number to page. what could be the problem...