Here I am going to show how you can bind the GridView with Linq.
First let us have a look to our aspx page.
/*.aspx page*/
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!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">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<table align="center">
<tr>
<td>
<asp:Label ID="Label1" runat="server" Text="Region:"></asp:Label>
</td>
<td>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddlregion" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlregion_SelectedIndexChanged">
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px"
CellPadding="4" ForeColor="Black" GridLines="Vertical">
<FooterStyle BackColor="#CCCC99" />
<RowStyle BackColor="#F7F7DE" />
<Columns>
<asp:BoundField HeaderText="Name" DataField="name" />
<asp:BoundField HeaderText="Country" DataField="country" />
<asp:BoundField HeaderText="Region" DataField="region"/>
<asp:BoundField HeaderText="City" DataField="city"/>
</Columns>
<PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
<SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress ID="UpdateProgress1" runat="server">
<ProgressTemplate>
Loading...
</ProgressTemplate>
</asp:UpdateProgress>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
The code behind to fetch the records through linq and bind it to the GridView.
/*.cs file for Bind Gridview*/
using System;
using System.Collections;
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.SqlClient;
public partial class Default2 : System.Web.UI.Page
{
connect connect = new connect(); // Connection class contain connection string.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Bindregiondata();
}
}
private void Bindregiondata()
{
using (SqlConnection con = new SqlConnection(connect.Getconnection()))
{
con.Open();
testLINQinfoDataContext db = new testLINQinfoDataContext();
var regioninfo = from p in db.REGIONs
orderby p.regionname
select new
{
regionid = p.regionid,
regionname = p.regionname
};
ddlregion.DataSource = regioninfo;
ddlregion.DataTextField = "regionname";
ddlregion.DataValueField = "regionid";
ddlregion.DataBind();
ddlregion.Items.Insert(0, "--Select Regioname--");
}
}
protected void ddlregion_SelectedIndexChanged(object sender, EventArgs e)
{
using (SqlConnection con = new SqlConnection(connect.Getconnection()))
{
testLINQinfoDataContext db = new testLINQinfoDataContext();
var employeeinfo = from p in db.EMPLOYEEINFOs
join c in db.COUNTRies
on p.countryid equals c.countryid
join r in db.REGIONs
on p.regionid equals r.regionid
join d in db.CITies
on p.cityid equals d.cityid
where p.regionid == Convert.ToInt32(ddlregion.SelectedItem.Value)
select new
{
name = p.empname,
country = c.countryname,
region = r.regionname,
city = d.cityname
};
GridView1.DataSource = employeeinfo;
GridView1.DataBind();
}
}
}