VB.NET ASP.NET StringBuilder Source Code Example

Posted by asp.net videos on Sunday, December 20, 2009 · Leave a Comment

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VB.NET ASP.NET StringBuilder Source Code Example

Purpose: – Illustrates using StringBuilder and StringBuilder Methods in VB.NET ASP.NET.

Prerequistes:

Install Visual Web Developer 2008
Install SQL Server Express
Download Northwind and Pubs Databases
Attach Northwind Database to Databases in Sql Express
Attach pubs Database to Databases in Sql Express

Notes:

You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.

Instructions:

Use Visual Web Developer 2008
Create new web site;
- Click File/New Web Site
- Select ASP.NET Website Template
- Select Visual Basic for Language
- name of Web Site could be VBNET_ASPNET_Syntax.
Add New folder named "LanguageBasics"
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: LanguageBasics
Add Web Form Named StringBuilder to LanguageBasics folder
- Right-click LanguageBasics folder;
- add new item;
- Select Web Form
- Check place code behind in separate file
- Web Form name could be StringBuilder
Click on copy code in code below to copy code into web form StringBuilder.aspx
Click on copy code in second set of code below to copy code into code-behind StringBuilder.aspx.vb
Right-click on StringBuilder.aspx in solution explorer and select view in browser

Step 1: Click on Copy Code to Cut-n-paste code into StringBuilder.aspx

 XML |   copy code | ?  
01 
02 <%@ Page Language="VB" AutoEventWireup="false" CodeFile="StringBuilder.aspx.vb" Inherits="LanguageBasics_StringBuilder" %>
03  
04 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
05  
06 <html xmlns="http://www.w3.org/1999/xhtml">
07 <head runat="server">
08     <title></title>
09 </head>
10 <body>
11     <form id="form1" runat="server">
12     <div>
13         <asp:Label ID="Label1a" runat="server" Text="Label"></asp:Label><br />
14         <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br /><br />
15         <asp:Label ID="Label2a" runat="server" Text="Label"></asp:Label><br />
16         <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label><br /><br />
17         <asp:Label ID="Label3a" runat="server" Text="Label"></asp:Label><br />
18         <asp:Label ID="Label3" runat="server" Text="Label"></asp:Label><br /><br />
19         <asp:Label ID="Label4a" runat="server" Text="Label"></asp:Label><br />
20         <asp:Label ID="Label4" runat="server" Text="Label"></asp:Label><br /><br />
21         <asp:Label ID="Label5a" runat="server" Text="Label"></asp:Label><br />
22         <asp:Label ID="Label5" runat="server" Text="Label"></asp:Label><br /><br />
23  
24     </div>
25     </form>
26 </body>
27 </html>
28  
29  
30

Step 2: Click on Copy Code to Cut-n-paste code into StringBuilder.aspx.vb

 Visual Basic |   copy code | ?  
001 
002  
003 Imports System.Text
004 Imports System
005 Imports System.Text.StringBuilder
006 Partial Class LanguageBasics_StringBuilder
007     Inherits System.Web.UI.Page
008  
009  
010     Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
011  
012  
013         '****************************************************************************************
014         ' Example #1: StringBuilder Append(string) - most common way stringbuilder is used
015         ' Adds the specified string or string representation of the specified value to the end 
016         ' of the string
017         '****************************************************************************************
018  
019  
020         Dim sb As New StringBuilder
021  
022         Label1a.Text = "Example #1: Simple StringBuilder Append(string) "
023         sb.Append("First Line")
024         sb.Append("<br />")
025         sb.Append("Second Line")
026  
027         Label1.Text = sb.ToString()
028  
029  
030         'Append(string, startIndex, count)
031         '****************************************************************************************
032         ' Example #2: StringBuilder Append(string, startIndex, count) 
033         ' Adds a substring of the specified string, starting with the specified
034         ' position and having the specified length, to the end of the string
035         '****************************************************************************************
036  
037  
038         Dim sb2 As New StringBuilder
039         Label2a.Text = "Example #2: StringBuilder Append(string, startIndex, count)"
040         sb2.Append("The dog and cat ")
041         sb2.Append("love to fight and play", 0, 13) 'take love to fight and add to end of prev string
042         Label2.Text = sb2.ToString()
043  
044  
045  
046         'Insert(index, string[, count])
047         '****************************************************************************************
048         ' Example #3: StringBuilder Insert(index, string[, count]) 
049         ' Inserts the specified string or a string representation of the specified
050         ' value at the specified position in the string the specified number of 
051         ' times. If the count is ommitted, a single copy of the string is inserted.
052         '****************************************************************************************
053  
054  
055         Dim sb3 As New StringBuilder
056         Label3a.Text = "Example #3: Insert(index, string[, count])"
057  
058         sb3.Append("This is the initial sentence")
059         sb3.Insert(20, "and modified ", 2)
060         Label3.Text = sb3.ToString()
061  
062  
063  
064         'Remove(startIndex,count)
065         '****************************************************************************************
066         ' Example #4: StringBuilder Remove(startIndex,count) 
067         ' Removes the specified number of characters from the string starting at
068         ' the specified position
069         '****************************************************************************************
070  
071  
072         Dim sb4 As New StringBuilder
073         Label4a.Text = "Example #4: StringBuilder Remove(startIndex,count)"
074  
075         sb4.Append("This is the initial sentence")
076         sb4.Remove(20, 8)
077         Label4.Text = sb4.ToString()
078  
079  
080  
081         'Replace(oldString,newString [,startIndex][,count])
082         '****************************************************************************************
083         ' Example #5: StringBuilder Replace(oldString,newString [,startIndex][,count])
084         ' Replaces all occurences of the old string with the new string starting
085         ' at the specified position and continuing for the specified number of characters.
086         ' If you omit startIndex, it starts at beginning
087         ' If you omit count, it does entire string
088         '****************************************************************************************
089  
090         Dim sb5 As New StringBuilder
091         Label5a.Text = "Example #5: StringBuilder Replace(oldString,newString [,startIndex][,count])"
092  
093  
094         sb5.Append("This is the initial sentence")
095         sb5.Replace("initial", "new")
096         Label5.Text = sb5.ToString()
097  
098  
099  
100     End Sub
101 End Class
102  
103  
104  
105  
106

Step 3: Click on Copy Code to Cut-n-paste code into web.config right after the appSettings section

 XML |   copy code | ?  
1 
2 <connectionStrings>
3     <add name="Northwind_ConnectionString"
4       connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" />
5     <add name="Pubs_ConnectionString"
6       connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" />
7   </connectionStrings>
8

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VB.NET ASP.NET StringBuilder Source Code Example

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01
02	<%@ Page Language="VB" AutoEventWireup="false" CodeFile="StringBuilder.aspx.vb" Inherits="LanguageBasics_StringBuilder" %>
03
04	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
05
06	<html xmlns="http://www.w3.org/1999/xhtml">
07	<head runat="server">
08	<title></title>
09	</head>
10	<body>
11	<form id="form1" runat="server">
12	<div>
13	<asp:Label ID="Label1a" runat="server" Text="Label"></asp:Label><br />
14	<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br /><br />
15	<asp:Label ID="Label2a" runat="server" Text="Label"></asp:Label><br />
16	<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label><br /><br />
17	<asp:Label ID="Label3a" runat="server" Text="Label"></asp:Label><br />
18	<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label><br /><br />
19	<asp:Label ID="Label4a" runat="server" Text="Label"></asp:Label><br />
20	<asp:Label ID="Label4" runat="server" Text="Label"></asp:Label><br /><br />
21	<asp:Label ID="Label5a" runat="server" Text="Label"></asp:Label><br />
22	<asp:Label ID="Label5" runat="server" Text="Label"></asp:Label><br /><br />
23
24	</div>
25	</form>
26	</body>
27	</html>
28
29
30

001
002
003	Imports System.Text
004	Imports System
005	Imports System.Text.StringBuilder
006	Partial Class LanguageBasics_StringBuilder
007	Inherits System.Web.UI.Page
008
009
010	Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
011
012
013	'****************************************************************************************
014	' Example #1: StringBuilder Append(string) - most common way stringbuilder is used
015	' Adds the specified string or string representation of the specified value to the end
016	' of the string
017	'****************************************************************************************
018
019
020	Dim sb As New StringBuilder
021
022	Label1a.Text = "Example #1: Simple StringBuilder Append(string) "
023	sb.Append("First Line")
024	sb.Append("<br />")
025	sb.Append("Second Line")
026
027	Label1.Text = sb.ToString()
028
029
030	'Append(string, startIndex, count)
031	'****************************************************************************************
032	' Example #2: StringBuilder Append(string, startIndex, count)
033	' Adds a substring of the specified string, starting with the specified
034	' position and having the specified length, to the end of the string
035	'****************************************************************************************
036
037
038	Dim sb2 As New StringBuilder
039	Label2a.Text = "Example #2: StringBuilder Append(string, startIndex, count)"
040	sb2.Append("The dog and cat ")
041	sb2.Append("love to fight and play", 0, 13) 'take love to fight and add to end of prev string
042	Label2.Text = sb2.ToString()
043
044
045
046	'Insert(index, string[, count])
047	'****************************************************************************************
048	' Example #3: StringBuilder Insert(index, string[, count])
049	' Inserts the specified string or a string representation of the specified
050	' value at the specified position in the string the specified number of
051	' times. If the count is ommitted, a single copy of the string is inserted.
052	'****************************************************************************************
053
054
055	Dim sb3 As New StringBuilder
056	Label3a.Text = "Example #3: Insert(index, string[, count])"
057
058	sb3.Append("This is the initial sentence")
059	sb3.Insert(20, "and modified ", 2)
060	Label3.Text = sb3.ToString()
061
062
063
064	'Remove(startIndex,count)
065	'****************************************************************************************
066	' Example #4: StringBuilder Remove(startIndex,count)
067	' Removes the specified number of characters from the string starting at
068	' the specified position
069	'****************************************************************************************
070
071
072	Dim sb4 As New StringBuilder
073	Label4a.Text = "Example #4: StringBuilder Remove(startIndex,count)"
074
075	sb4.Append("This is the initial sentence")
076	sb4.Remove(20, 8)
077	Label4.Text = sb4.ToString()
078
079
080
081	'Replace(oldString,newString [,startIndex][,count])
082	'****************************************************************************************
083	' Example #5: StringBuilder Replace(oldString,newString [,startIndex][,count])
084	' Replaces all occurences of the old string with the new string starting
085	' at the specified position and continuing for the specified number of characters.
086	' If you omit startIndex, it starts at beginning
087	' If you omit count, it does entire string
088	'****************************************************************************************
089
090	Dim sb5 As New StringBuilder
091	Label5a.Text = "Example #5: StringBuilder Replace(oldString,newString [,startIndex][,count])"
092
093
094	sb5.Append("This is the initial sentence")
095	sb5.Replace("initial", "new")
096	Label5.Text = sb5.ToString()
097
098
099
100	End Sub
101	End Class
102
103
104
105
106

1
2	<connectionStrings>
3	<add name="Northwind_ConnectionString"
4	connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" />
5	<add name="Pubs_ConnectionString"
6	connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" />
7	</connectionStrings>
8