Range of records from database

In ADO.NET, DataTable objects are utilized to represent tables within a DataSet. The DataSet, designed for use in disconnected mode, is a container for one or more DataTables that hold data retrieved from a data source.

Dim ds As New DataSet
DataSet ds = new DataSet();

There may be scenarios where you only need to retrieve a specific range of rows from the data source and populate the DataSet accordingly. In such cases, you can use the DataAdapter to fetch and fill the DataSet with the desired range of rows. The following piece of code shows how to fill specific range of rows from DataAdapter to Dataset.

DataAdapter.Fill(Dataset, 5, 3, "tablename")
DataAdapter.Fill(Dataset, 5, 3, "tablename");

The above code will fill the Dataset starting from 5th row and 3 rows.

  1. 5 is the starting row no
  2. 3 is no of rows we want to fill.

The following ASP.NET program select data from authors table and display row no 5 to 3 rows.

<!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 id="Head1" runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" /> <br /> <asp:ListBox ID="ListBox1" runat="server"></asp:ListBox> <br /> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> </div> </form> </body> </html>
Full Source | C#
using System; using System.Data ; using System.Data.SqlClient ; using System.Configuration; public partial class _Default : System.Web.UI.Page { protected void Button1_Click(object sender, EventArgs e) { string connectionString = ConfigurationManager.ConnectionStrings["SQLDbConnection"].ToString(); SqlConnection connection = new SqlConnection(connectionString); SqlDataAdapter adapter = new SqlDataAdapter(); DataSet ds = new DataSet(); try { connection.Open(); adapter = new SqlDataAdapter("select au_lname from authors", connection ); connection.Close(); adapter.Fill(ds, 5, 3, "authors"); //5 is starting row no. //3 is no of rows to retrieve ListBox1.DataSource = ds.Tables[0]; ListBox1.DataTextField = "au_lname"; ListBox1.DataBind(); } catch (Exception ex) { Label1.Text = "Error in execution " + ex.ToString(); } } }
Full Source | VB.NET
Imports System.Data Imports System.Data.SqlClient Imports System.Configuration Partial Class _Default Inherits System.Web.UI.Page Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click Dim connectionString As String Dim connection As SqlConnection connectionString = ConfigurationManager.ConnectionStrings("SQLDbConnection").ToString connection = New SqlConnection(connectionString) Dim adapter As SqlDataAdapter Dim ds As New DataSet Try connection.Open() adapter = New SqlDataAdapter("select au_lname from authors", connection) adapter.Fill(ds, 5, 3, "authors") '5 is starting row no. '3 is no of rows to retrieve connection.Close() ListBox1.DataSource = ds.Tables(0) ListBox1.DataTextField = "au_lname" ListBox1.DataBind() Catch ex As Exception Label1.Text = "Error in execution " & ex.ToString End Try End Sub End Class


By utilizing this approach, you can efficiently retrieve and fill a DataSet with only the required subset of rows from the data source. This allows for better performance and reduces the amount of data transferred and stored in memory.