Show data in Gridview using dataset, datatable and data reader.

In this blog we will know how to show data in Gridview using dataset, datatable and data reader.

<%@ 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">

<title>Untitled Page</title>

</head>

<body>

<div>

</div>

<asp:GridView ID="GridView1" runat="server">

</asp:GridView>

<asp:Button ID="Button1" runat="server" onclick="Button1_Click"

Text="Using Dataset" />

<asp:Button ID="Button2" runat="server" onclick="Button2_Click"

Text="Using Datatable" />

<asp:Button ID="Button3" runat="server" onclick="Button3_Click"

Text="Using Datareader" />

</form>

</body>

</html>

using System;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using System.Data.OleDb;

public partial class _Default : System.Web.UI.Page

{

OleDbConnection con;

OleDbCommand com;

OleDbDataAdapter oda;

DataSet ds;

DataTable dataTable;

protected void Button1_Click(object sender, EventArgs e)

{

con = new OleDbConnection("Provider = Microsoft.Jet.OLEDB.4.0; Data Source = D:\\mydb.mdb");

com = new OleDbCommand("Select * from emp", con);

con.Open();

oda = new OleDbDataAdapter(com);

ds = new DataSet();

oda.Fill(ds, "emp");

con.Close();

GridView1.DataMember = "emp";

GridView1.DataSource = ds;

GridView1.DataBind();

}

protected void Button2_Click(object sender, EventArgs e)

{

con = new OleDbConnection("Provider = Microsoft.Jet.OLEDB.4.0; Data Source = D:\\mydb.mdb");

dataTable = new DataTable();

com = new OleDbCommand();

com.Connection = con;

con.Open();

com.CommandText = "Select * from emp";

oda = new OleDbDataAdapter(com);

oda.Fill(dataTable);

con.Close();

GridView1.DataSource = dataTable;

GridView1.DataMember = "emp";

GridView1.DataBind();

}

protected void Button3_Click(object sender, EventArgs e)

{

con = new OleDbConnection("Provider = Microsoft.Jet.OLEDB.4.0; Data Source = D:\\mydb.mdb");

com = new OleDbCommand("Select * from emp", con);

con.Open();

OleDbDataReader reader;

reader = com.ExecuteReader();

GridView1.DataMember = "emp";

GridView1.DataSource = reader;

GridView1.DataBind();

reader.Close();

con.Close();

}