<%@
Page Language="C#" AutoEventWireup="true"
CodeFile="Default.aspx.cs"
Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML
1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Grid Search example</title>
<style type="text/css">
.highlight
{
text-decoration:none;
font-weight:bold;
color:black;
background:yellow;}
</style>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1"
runat="server" />
<div>
Enter
first name to search:
</div>
<div>
<asp:TextBox ID="txtSearch" runat="server"
AutoPostBack="True"
OnTextChanged="txtSearch_TextChanged">
</asp:TextBox>
</div>
<div>
<asp:UpdatePanel ID="UpdatePanel1"
runat="server">
<ContentTemplate>
<asp:GridView ID="grdSearch"
runat="server"
AutoGenerateColumns="false">
<Columns>
<asp:TemplateField HeaderText="FirstName">
<ItemTemplate>
<asp:Label ID="lblFirstName"
runat="server"
Text='<%#
Highlight(Eval("FirstName").ToString()) %>'>
</asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="LastName">
<ItemTemplate>
<asp:Label ID="lblLastName" runat="server"
Text='<%#(Eval("LastName"))
%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Location">
<ItemTemplate>
<asp:Label ID="lblLocation" runat="server"
Text='<%#(Eval("Location"))
%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtSearch"
EventName="TextChanged" />
</Triggers>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
And it code behind
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Text.RegularExpressions;
public partial class
_Default : System.Web.UI.Page
{
string strConnection =
ConfigurationManager.AppSettings["ConnectionString"];
protected void Page_Load(object
sender, EventArgs e)
{
if (!IsPostBack)
{
BindGrid();
}
}
private DataTable GetRecords()
{
SqlConnection
conn = new SqlConnection(strConnection);
conn.Open();
SqlCommand
cmd = new SqlCommand();
cmd.Connection
= conn;
cmd.CommandType
= CommandType.Text;
cmd.CommandText
= "Select
* from Employees";
SqlDataAdapter
dAdapter = new SqlDataAdapter();
dAdapter.SelectCommand
= cmd;
DataSet
objDs = new DataSet();
dAdapter.Fill(objDs);
return objDs.Tables[0];
}
private void BindGrid()
{
DataTable
dt = GetRecords();
if (dt.Rows.Count > 0)
{
grdSearch.DataSource
= dt;
grdSearch.DataBind();
}
}
private void SearchText()
{
DataTable
dt = GetRecords();
DataView
dv = new DataView(dt);
string SearchExpression = null;
if (!String.IsNullOrEmpty(txtSearch.Text))
{
SearchExpression
= string.Format("{0} '%{1}%'",
grdSearch.SortExpression,
txtSearch.Text);
}
dv.RowFilter
= "FirstName
like" +
SearchExpression;
grdSearch.DataSource
= dv;
grdSearch.DataBind();
}
public string Highlight(string
InputTxt)
{
string Search_Str = txtSearch.Text.ToString();
//
Setup the regular expression and add the Or operator.
Regex
RegExp = new Regex(Search_Str.Replace(" ", "|").Trim(),
RegexOptions.IgnoreCase);
//
Highlight keywords by calling the
//delegate
each time a keyword is found.
return RegExp.Replace(InputTxt,
new MatchEvaluator(ReplaceKeyWords));
//
Set the RegExp to null.
RegExp
= null;
}
public string ReplaceKeyWords(Match m)
{
return "<span class=highlight>" + m.Value + "</span>";
}
protected void txtSearch_TextChanged(object sender, EventArgs e)
{
SearchText();
}
}
