Replace Example Syntax VB.NET ASP.NET | Replace | Source Code

Posted by on Saturday, March 5, 2011 · Leave a Comment 

Replace Example Syntax VB.NET ASP.NET | Replace | Source Code

Summary: – Illustrates using with in VB.NET ASP.NET.

 *** 1. Download Source Code *** 
VB.NET Syntax StringManipulation Replace download Download Source Code for All VB ASP.NET Examples in One Project – source code for hundreds of VB.NET ASP.NET examples neatly organized in a single project. Check back often to download the latest version of the project with even more code samples.

 *** 2. Replace Syntax *** 


Purpose:
Returns a string with all occurrences of the old string in the string
replaced by the new string.


Syntax:
Replace(string, oldstring, newstring)

Parameters Description
string Required – string – that you use as the source
for having all occurrences of oldstring replaced with newstring
oldstring Required – string that you want to search
for so you can replace all occurrences of it.
newstring Required – string that you want to replace
the oldstring with.

Result Data Type Description
string Returns a string with all occurrences of the old string in the string
replaced by the new string.


 *** 3. Replace – Quick Example *** 
Dim strField As String = “This is my string”
Dim strOldField As String = “my”
Dim strNewField As String = “your”
TextBox1.Text = Replace(strField, strOldField, strNewField) ‘Returns This is your string

 *** 4. Replace – Full Example *** 

Replace Example Output Screenshot


VB.NET Syntax StringManipulation Replace screenshot


Step 1: Click on Visual Basic to Cut-n-paste code into Replace.aspx.vb

Imports System
Imports System.IO
Imports System.Data
 
' This example is from http://idealprogrammer.com
' It shows how you can use Replace syntax in VB.NET ASP.NET
'****************************************************************************************
' Purpose:  Returns a string with all occurrences of the old string in the string
' replaced by the new string.
'
' Syntax: 	Replace(string, oldstring, newstring)
'
' Parameter1: string - Required - string - that you use as the source
' for having all occurrences of oldstring replaced with newstring
'
' Parameter2: oldstring - Required - string that you want to search
' for so you can replace all occurrences of it.
'
' Parameter3: newstring - Required - string that you want to replace
' the oldstring with.
'
' Result: string -  Returns a string with all occurrences of the old string in the string
' replaced by the new string.
'
' Quick Example:      Dim strField As String = "This is my string"
' Dim strOldField As String = "my"
' Dim strNewField As String = "your"
' TextBox1.Text = Replace(strField, strOldField, strNewField) 'Returns This is your string
'
'****************************************************************************************
 
Partial Class _Replace
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 
        Label1.Text = "Example #1: Replace(strField, strOldField, strNewField)"
 
        Dim strField As String = "This is my string"
        Dim strOldField As String = "my"
        Dim strNewField As String = "your"
 
        ' Replace rest of string starting with word "test"
        TextBox1.Text = Microsoft.VisualBasic.Replace(strField, strOldField, strNewField) 'Returns This is your string
 
 
 
    End Sub
End Class

Step 2: Click on XML to Cut-n-paste code into Replace.aspx

< %@ Page Language="VB" AutoEventWireup="false" CodeFile="Replace.aspx.vb" Inherits="_Replace" %>
 
< !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 runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h1><asp:label ID="Label1" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox1" runat="server"></asp:textbox><br />
          <h1><asp:label ID="Label2" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox2" runat="server"></asp:textbox><br />
          <h1><asp:label ID="Label3" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox3" runat="server"></asp:textbox><br />
 
 
 
    </div>
    </form>
</body>
</html>

Prerequistes:

  1. Install Visual Web Developer 2010
  2. Install SQL Server Express
  3. Download Northwind and Pubs Databases
  4. Attach Northwind Database to Databases in Sql Express
  5. 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:

VB.NET ASP.NET Syntax StringManipulation Replace
  1. Use Visual Web Developer 2010
  2. 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.
  3. Add New folder named “StringManipulation”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: StringManipulation
  4. Add Web Form Named Replace to StringManipulation folder
    • Right-click StringManipulation folder;
    • add new item;
    • Select Web Form
    • Check place code behind in separate file
    • Web Form name could be Replace
  5. Click on Visual Basic in step 1 at the top of this page to copy code into code-behind Replace.aspx.vb
  6. Click on XML in step 2 above to copy code into web form Replace.aspx
  7. Right-click on Replace.aspx in solution explorer and select view in browser

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