Introduction
The PagedDataSource class is used to provide a paging facility to a DataBound
control, such as DataList, Repeater, GridView, DetailsView, etc. Although there is
an AllowPaging property to handle paging in these controls. But the AllowPaging
property does not work with DataList and Repeater controls. So using
the PagedDataSource is very much a suitable for adding the paging feature to these (DataList and Repeater) controls. The following are some more important properties of a
PagedDataSource.
AllowPaging -
This property is used to enable paging. Set it to "True" or "False".
DataSource -
To set datasource.
CurrentPageIndex -
To set the index of current page.
PageCount - It count the total
number of available page.
FirstIndexInPage -
It returns the index of first page.
IsFirstPage -
It returns boolean value (True or False) to
indicate whether it is first page or not.
IsLastPage - It returns
boolean value (True or False) to indicate whether it is last page or not.
Now, using these properties I am
showing records from a database using a Repeater control. In this example,
the database name is "student" and the database table is "student_detail" which has some
records. I am showing all the records of the database table to make this easier to
understand.
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Take a ASP.NET Web Application -> take a Repeater and a button control and
arrange them as in the following figure.
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Code on .aspx
<%@
Page Language="C#"
AutoEventWireup="true"
CodeBehind="WebForm2.aspx.cs"
Inherits="PagedDataSourceclass.WebForm2"
%>
<!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></title>
</head>
<body>
<form
id="form1"
runat="server">
<div>
<table>
<asp:Repeater
ID="Repeater1"
runat="server">
<HeaderTemplate>
<h3>Details
Of Students</h3>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td>
<font
color="Red"><b>Roll
Number</b></font>
</td>
<td>
<font
color="Red"><b>Name</b></font>
</td>
<td>
<font
color="Red"><b>Age</b></font>
</td>
<td>
<font
color="Red"><b>Course</b></font>
</td>
</tr>
<td>
<font
color="Green"><%#
Eval("roll_no")
%></font>
</td>
<td>
<font
color="Green"><%#Eval("s_name")
%></font>
</td>
<td>
<font
color="Green"><%#Eval("age")
%></font>
</td>
<td>
<font
color="Green"><%#Eval("course")
%></font>
</td>
</ItemTemplate>
</asp:Repeater>
<tr>
<td
colspan="4">
<asp:Button
ID="btnshow"
runat="server"
Height="32px"
Text="Show"
Font-Bold="true"
Font-Size="12"
ForeColor="DarkRed"
Width="97px"
onclick="btnshow_Click"
/>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
aspx.cs
using
System;
using
System.Collections.Generic;
using
System.Linq;
using System.Web;
using
System.Web.UI;
using
System.Web.UI.WebControls;
using
System.Data.SqlClient;
using
System.Data;
namespace
PagedDataSourceclass
{
public partial
class WebForm2
: System.Web.UI.Page
{
protected void
Page_Load(object sender,
EventArgs e)
{
}
SqlDataAdapter dadapter;
PagedDataSource pds;
DataSet dset;
string connstring =
"database=student;server=.;user=sa;password=wintellect";
protected void
btnshow_Click(object sender,
EventArgs e)
{
DataBind();
}
public void
DataBind()
{
dadapter=new
SqlDataAdapter("select
* from student_detail",connstring );
dset=new
DataSet();
pds=new
PagedDataSource();
dadapter.Fill(dset);
pds.DataSource=dset.Tables[0].DefaultView;
Repeater1.DataSource = pds;
Repeater1.DataBind();
}
}
}
Run the application. After clicking the "Show" button, all records will be shown.
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Now we use some properties of the PagedDatasource ( which are mentioned above ) in
this application. We add paging facility means we want to show some
limited record in Repeater at a time. Take two Buttons and set its Text property
to "Next" and "Previous" and write the following code.
using System;
using
System.Collections.Generic;
using
System.Linq;
using System.Web;
using
System.Web.UI;
using
System.Web.UI.WebControls;
using
System.Data.SqlClient;
using
System.Data;
namespace
PagedDataSourceclass
{
public partial
class WebForm2
: System.Web.UI.Page
{
protected void
Page_Load(object sender,
EventArgs e)
{
if (!IsPostBack)
{
ViewState["vs"] = 0;
}
position = (int)ViewState["vs"];
}
SqlDataAdapter dadapter;
PagedDataSource pds;
DataSet dset;
string connstring =
"database=student;server=.;user=sa;password=wintellect";
protected void
btnshow_Click(object sender,
EventArgs e)
{
DataBind();
}
public void
DataBind()
{
dadapter=new
SqlDataAdapter("select
* from student_detail",connstring );
dset=new
DataSet();
pds=new
PagedDataSource();
dadapter.Fill(dset);
pds.DataSource=dset.Tables[0].DefaultView;
pds.AllowPaging=true;
pds.CurrentPageIndex =position;
pds.PageSize = 2;
Repeater1.DataSource = pds;
Repeater1.DataBind();
}
int position;
protected void
btnprevious_Click(object sender,
EventArgs e)
{
position = (int)ViewState["vs"];
position--;
ViewState["vs"] = position;
DataBind();
}
protected void
btnnext_Click(object sender,
EventArgs e)
{
position = (int)ViewState["vs"];
position++;
ViewState["vs"] = position;
DataBind();
}
}
}
Look at the code shown above. In the DataBind method I have set 2 for PageSize. Means only 2 records will be displayed at a time. At Button click I am setting
incrementing or decrementing value for
CurrentPageIndex. Run the
application and click the "Show" button.
![]()
Click at
"Next" button to show next records.
![]()
If we want to disable the "Previous" button when the first page is showing and the "Next"
button then when last page is showing. Update the code of DataBind method with the following code.
public void
DataBind()
{
dadapter=new
SqlDataAdapter("select
* from student_detail",connstring );
dset=new
DataSet();
pds=new
PagedDataSource();
dadapter.Fill(dset);
pds.DataSource=dset.Tables[0].DefaultView;
pds.AllowPaging=true;
pds.CurrentPageIndex =position;
pds.PageSize = 2;
btnprevious.Enabled = !pds.IsFirstPage;
btnnext.Enabled = !pds.IsLastPage;
Repeater1.DataSource = pds;
Repeater1.DataBind();
}
Run the application and click "show" button.
![]()
Look at above figure. It is showing
record of first page, so "Previous" button is disabled. Same as when you will
reach at last page, the "Next" button will be disabled.
Here are some related resourse.