Introduction

Begin by adding a using statement for System.text library, since StringBuilder is located in the System.Text namespace. Use StringBuilder to modify a string without creating a new object or concatenating many strings together in a loop.

In this article I will show how to search using Google for a value in a TextBox using ASP.NET.

Complete Program

Search_Value.aspx.cs

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Web;
  5. using System.Web.UI;
  6. using System.Web.UI.WebControls;
  7. using System.Text;
  8. public partial class Search_Value : System.Web.UI.Page
  9. {
  10. protected void Page_Load(object sender, EventArgs e)
  11. {
  12. }
  13. protected void Button1_Click(object sender, EventArgs e)
  14. {
  15. try
  16. {
  17. string text = string.Empty;
  18. StringBuilder txtaddress = new StringBuilder();
  19. txtaddress.Append("https://www.google.com/search?q=");
  20. if (searchtxt.Text != string.Empty)
  21. {
  22. text=searchtxt.Text.Replace(' ','+');
  23. txtaddress.Append(text+' '+ '+');
  24. }
  25. string url = txtaddress.ToString();
  26. Response.Redirect(url, false);
  27. }
  28. catch (Exception ex)
  29. {
  30. Response.Redirect(ex.ToString());
  31. }
  32. }
  33. }

Search_Value.aspx

  1. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Search_Value.aspx.cs" Inherits="Search_Value" %>
  2. <!DOCTYPE html>
  3. <html xmlns="http://www.w3.org/1999/xhtml">
  4. <head runat="server">
  5. <title></title>
  6. </head>
  7. <body>
  8. <form id="form1" runat="server">
  9. <div style="border-style: double; border-width: medium; padding: inherit; margin: inherit; height: 194px;
  10. width: 349px; background-color: #808080; visibility: visible;">
  11. <br />
  13. <asp:Label ID="Label1" runat="server" Font-Bold="True" Font-Italic="True" Font-Size="Large"
  14. ForeColor="Blue" Text="Search a value in Google"></asp:Label>
  15. <br />
  16. <br />
  18. <asp:Label ID="Label2" runat="server" Text="Enter Search Text"></asp:Label>
  20. <asp:TextBox ID="searchtxt" runat="server"></asp:TextBox>
  21. <br />
  22. <br />
  25. <asp:Button ID="Button1" runat="server" Font-Bold="True" OnClick="Button1_Click" Text="Search" />
  26. <br /><br /><br /><br /><br /><br /><br /><br /></div><br />
  27. </form>
  28. </body>
  29. </html>

Output

Animation1.gif

For more information, download the attached sample application.