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Paging in datalist using PagedDataSource class in VB.NET

Posted by Satyapriya Nayak in Blogs | ASP.NET using VB.NET on Sep 08, 2011

In this blog we will know how to do Paging in datalist using PagedDataSource class.

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In this blog we will know how to do Paging in datalist using PagedDataSource class. Drag and drop a DataList control, one label, and two buttons controls to the WebPages.

Table structure

Program

Default.aspx code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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>Untitled Page</title>
</head>
<body>
 <form id="form1" runat="server">
 <div>
 <table border="1">
 <asp:DataList ID="dl1" runat="server">
 <HeaderTemplate>
 Employee Details
 </HeaderTemplate>
 <itemtemplate>
 <tr>
 <td>ID</td>
 <td>NAME</td>
 <td>SALARY</td>
 <td>ADDRESS</td>
 <td>DESIGNATION</td>
 </tr>
 <tr>
 <td> <%#Eval("empid")%></td>
 <td> <%#Eval("empname")%></td>
 <td> <%#Eval("empsal")%></td>
 <td> <%#Eval("empadd")%></td>
 <td> <%#Eval("empdes")%></td>
 </tr>
 </itemtemplate>
 </asp:DataList>
 </table>
 <table width="100%" border="0">
 <tr>
 <td> <asp:label id="lbl1" runat="server" BackColor="Yellow" BorderColor="Yellow"
 Font-Bold="True" ForeColor="#FF3300"></asp:label></td>
 </tr>
 <tr>
 <td> <asp:button id="btnPrevious" runat="server" text="Previous" Width="60px"
 onclick="btnPrevious_Click"></asp:button>
 <asp:button id="btnNext" runat="server" text="Next" Width="60px"
 onclick="btnNext_Click"></asp:button></td>
 </tr>
 </table>
 </div>
 </form>
</body>
</html>

Default.aspx.vb code

Imports System.Data
Imports System.Data.SqlClient
Partial Class _Default
    Inherits System.Web.UI.Page
    Dim strConnString As String = System.Configuration.ConfigurationManager.ConnectionStrings.Item("ConnectionString").ToString()
    Dim con As New SqlConnection(strConnString)
    Dim str As String
    Dim com As SqlCommand
    Dim sqlda As SqlDataAdapter
    Dim ds As DataSet
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            binddatalist()
        End If
    End Sub
   Private Sub binddatalist()
        con.Open()
        Str = "select * from employee"
        com = New SqlCommand(Str, con)
        sqlda = New SqlDataAdapter(com)
        ds = New DataSet
        sqlda.Fill(ds, "employee")
        Dim Pds1 As New PagedDataSource()
        Pds1.DataSource = ds.Tables(0).DefaultView
        Pds1.AllowPaging = True
        Pds1.PageSize = 3
        Pds1.CurrentPageIndex = CurrentPage
        lbl1.Text = "Showing Page: " & (CurrentPage + 1).ToString() & " of " & Pds1.PageCount.ToString()
        btnPrevious.Enabled = Not Pds1.IsFirstPage
        btnNext.Enabled = Not Pds1.IsLastPage
        dl1.DataSource = Pds1
        dl1.DataBind()
        con.Close()
    End Sub
    Public Property CurrentPage() As Integer
        Get
            Dim s1 As Object = Me.ViewState("CurrentPage")
            If s1 Is Nothing Then
                Return 0
            Else
                Return CInt(s1)
            End If
        End Get
        Set(ByVal value As Integer)
            Me.ViewState("CurrentPage") = value
        End Set
    End Property
    Protected Sub btnPrevious_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles
btnPrevious.Click
        CurrentPage -= 1
        binddatalist()
    End Sub
    Protected Sub btnNext_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles
btnNext.Click
        CurrentPage += 1
        binddatalist()
    End Sub
End Class

Output

Thanks for reading

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