Add google search box to your web site !!

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <p>
        <br />
         
        <asp:Label ID="Label1" runat="server" Font-Bold="True" Text="Search "></asp:Label>
        <asp:TextBox ID="TextBox1" runat="server" Width="196px"></asp:TextBox>      
            <asp:Button ID="Button1" runat="server" Text="Search in Google" onclick="Button1_Click" />
        &nbsp;</p>
    <p>
        &nbsp;</p>
    <p>
    </p>
</asp:Content>

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

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        try
        {
            string text = string.Empty;
            StringBuilder textaddress = new StringBuilder();
            textaddress.Append("https://www.google.com/search?q=");
            if (TextBox1.Text != string.Empty)
            {
                text = TextBox1.Text.Replace(" ","+");
            textaddress.Append(text+""+"+");
            
            }
            string url = textaddress.ToString();
            Response.Redirect(url, false);           
            
        }
        catch(Exception ex)
        {
            Response.Write(ex.ToString());

        }
    }
}