Hightlight Searched Text In Gridview Using Asp.net ~ Aspdotnet Studio

Demo:-

Instruction:- To Execute this code Firstly Create the table using these fields below

And add the data to the Table.

Design 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 id="Head1" runat="server">
<title>Highlight the Search Keywords in Gridview </title>
<style type="text/css">
.GridviewDiv {font-size: 100%; font-family: 'Lucida Grande', 'Lucida Sans Unicode', Verdana, Arial, Helevetica, sans-serif; color: #303933;}
Table.Gridview{border:solid 1px #df5015;}
.Gridview th{color:#FFFFFF;border-right-color:#abb079;border-bottom-color:#abb079;padding:0.5em 0.5em 0.5em 0.5em;text-align:center}
.Gridview td{border-bottom-color:#f0f2da;border-right-color:#f0f2da;padding:0.5em 0.5em 0.5em 0.5em;}
.Gridview tr{color: Black; background-color: White; text-align:left}
:link,:visited { color: #DF4F13; text-decoration:none }
.highlight {text-decoration: none;color:black;background:yellow;}
</style>
</head>
<body>
<form id="form1" runat="server">
<div class="GridviewDiv">
<p>
Author Name:
<asp:TextBox ID="txtSearch" runat="server" />  
<asp:ImageButton ID="btnSearch" ImageUrl="~/SearchButton.png" runat="server"
Style="top: 5px; position: relative" onclick="btnSearch_Click" />  
<asp:ImageButton ID="btnClear" ImageUrl="~/Clearbutton.png" runat="server" Style="top: 5px;
position: relative" onclick="btnClear_Click" /><br />
<br />
</p>
<asp:GridView ID="gvDetails" runat="server" AutoGenerateColumns="False" AllowPaging="True"
AllowSorting="true" DataSourceID="dsDetails" Width="540px" PageSize="10" CssClass="Gridview" >
<HeaderStyle BackColor="SkyBlue" />
<Columns>
<asp:TemplateField HeaderText="Author">
<ItemTemplate>
<asp:Label ID="lblAuthor" Text='<%# HighlightText(Eval("Author").ToString()) %>' runat="server"/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Category">
<ItemTemplate>
<asp:Label ID="lblCategory" Text='<%# Eval("Category") %>' runat="server"/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Country">
<ItemTemplate>
<asp:Label ID="lblCountry" Text='<%#Eval("Country") %>' runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
<asp:SqlDataSource ID="dsDetails" runat="server" ConnectionString="<%$ConnectionStrings:dbconnection %>" SelectCommand="select * from TableU" FilterExpression="Author LIKE '%{0}%'">
<FilterParameters>
<asp:ControlParameter Name="Author" ControlID="txtSearch" PropertyName="Text" />
</FilterParameters>
</asp:SqlDataSource>
</form>
</body>
</html>

CodeBehind:-

using System;
using System.Text.RegularExpressions;
using System.Web.UI;

public partial class _Default : System.Web.UI.Page
{
// Create a String to store our search results
private string SearchString = "";
protected void Page_Load(object sender, EventArgs e)
{
}
public string HighlightText(string InputTxt)
{
string Search_Str = txtSearch.Text;
// 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));
}
public string ReplaceKeyWords(Match m)
{
return ("<span class=highlight>" + m.Value + "</span>");
}
protected void btnSearch_Click(object sender, ImageClickEventArgs e)
{
// Set the value of the SearchString so it gets
SearchString = txtSearch.Text;
}
protected void btnClear_Click(object sender, ImageClickEventArgs e)
{
// Simple clean up text to return the Gridview to it's default state
txtSearch.Text = "";
SearchString = "";
gvDetails.DataBind();
}
}