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Tuesday, 18 October 2016

Highlight Search Text in Gridview Asp.net C#

10/18/2016 - By Pranav Singh 0

This article will show you how you can search and highlight the text in a gridview control in asp.net using c#. This i have shown on button click event.

So for this article first we will create a new asp.net application and add a textbox,  Button control and a gridview control.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="SEarchAndHeilight.aspx.cs" Inherits="WebApplication7.SEarchAndHeilight" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Highlight Search Text in Gridview Asp.net C#</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            Search Text:
            <asp:TextBox ID="txtSearchText" runat="server"></asp:TextBox><asp:Button ID="btnSearch" runat="server" Text="Search" OnClick="btnSearch_Click" /><br />
            <br />
            <asp:GridView ID="GridView1" runat="server" OnRowDataBound="GridView1_RowDataBound" Width="100%"></asp:GridView>
        </div>
    </form>
</body>
</html>


Now we need to use the below code to highlight the text.

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication7
{
    public partial class SEarchAndHeilight : System.Web.UI.Page
    {
        string searchText = "";
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DataTable dt = new DataTable();
                dt = GetData();
                GridView1.DataSource = dt;
                GridView1.DataBind();
            }
        }
        public DataTable GetData()
        {
            DataTable _objdt = new DataTable();
            _objdt.Columns.Add("StudentName", typeof(string));
            _objdt.Columns.Add("Address", typeof(string));

            var _objrow = _objdt.NewRow();
            _objrow["StudentName"] = "Rajesh Singh";
            _objrow["Address"] = "Address 1";

            _objdt.Rows.Add(_objrow);
            _objrow = _objdt.NewRow();
            _objrow["StudentName"] = "Rakesh";
            _objrow["Address"] = "Address 2";
            _objdt.Rows.Add(_objrow);

            _objrow = _objdt.NewRow();
            _objrow["StudentName"] = "Vinay Singh";
            _objrow["Address"] = "Address 3";
            _objdt.Rows.Add(_objrow);

            _objrow = _objdt.NewRow();
            _objrow["StudentName"] = "Yougesh Singh";
            _objrow["Address"] = "Address 4";
            _objdt.Rows.Add(_objrow);

            return _objdt;
        }

        protected void btnSearch_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            dt = GetData();
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }

        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                //For row 1
                e.Row.Cells[0].Text = Regex.Replace(e.Row.Cells[0].Text, txtSearchText.Text.Trim(), delegate(Match match)
                {
                    return string.Format("<span style = 'background-color:red'>{0}</span>", match.Value);
                }, RegexOptions.IgnoreCase);
                //For row 2
                e.Row.Cells[1].Text = Regex.Replace(e.Row.Cells[1].Text, txtSearchText.Text.Trim(), delegate(Match match)
                {
                    return string.Format("<span style = 'background-color:red'>{0}</span>", match.Value);
                }, RegexOptions.IgnoreCase);
            }
        }

    }
}

In above code i have highlighted the search text on row data bound. So please check the code.

        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                //For row 1
                e.Row.Cells[0].Text = Regex.Replace(e.Row.Cells[0].Text, txtSearchText.Text.Trim(), delegate(Match match)
                {
                    return string.Format("<span style = 'background-color:red'>{0}</span>", match.Value);
                }, RegexOptions.IgnoreCase);
                //For row 2
                e.Row.Cells[1].Text = Regex.Replace(e.Row.Cells[1].Text, txtSearchText.Text.Trim(), delegate(Match match)
                {
                    return string.Format("<span style = 'background-color:red'>{0}</span>", match.Value);
                }, RegexOptions.IgnoreCase);
            }
        }

    }
}

In above code i have search for two rows. Because in example i have taken only two rows. You can perform this as many no of rows you want the highlight. Now we have done run the application to check the output.


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