VB.NET ASP.NET InStrRev() Source Code Syntax Example

Posted by on Monday, February 28, 2011 · Leave a Comment 

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

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

 *** 1. Download Source Code *** 
VB.NET Syntax StringManipulation InStrRev 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.

 *** 2. InStrRev Syntax *** 


Purpose:
returns integer of the position of the first occurrence of one string
within another, starting from the right side of the string. If the string is
not found, the result is 0


Syntax:
InStrRev(stringToSearch,stringToFind,startIndex,compareMethod)

Parameters Description
stringToSearch Required – string that you want to search
stringToFind Required – string that you are trying to
find into parameter2
startIndex Optional. Numeric expression setting the
one-based starting position for each search, starting from the
left side of the string. If Start is omitted then –1 is used,
meaning the search begins at the last character position.
Search then proceeds from right to left.
comparemethod Optional – integer indicating binary or text

Result Data Type Description
integer returns integer of the position of the first occurrence
of one string within another, starting from the right side of the
string. If the string is not found, the result is 0


 *** 3. InStrRev – Quick Example *** 
Dim strString1 As String = “Hello World”
TextBox1.Text = InStrRev(strString1, “l”).ToString() ‘Returns 10

 *** 4. InStrRev – Full Example *** 

InStrRev Example Output Screenshot


VB.NET Syntax StringManipulation InStrRev screenshot


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

Imports System
Imports System.IO
Imports System.Data
 
 
 
 
' This example is from http://idealprogrammer.com
' It shows how you can use InStrRev syntax in VB.NET ASP.NET
'****************************************************************************************
' Purpose:  returns integer of the position of the first occurrence of one string 
' within another, starting from the right side of the string. If the string is 
' not found, the result is 0
'
' Syntax: 	InStrRev(stringToSearch,stringToFind,startIndex,compareMethod)
'
' Parameter1: stringToSearch - Required - string that you want to search
'
' Parameter2: stringToFind - Required - string that you are trying to 
' find into parameter2
'
' Parameter3: startIndex - Optional.  Numeric expression setting the 
' one-based starting position for each  search, starting from the 
' left side of the string. If Start is omitted then –1 is used, 
' meaning the search begins at the last character position. 
' Search then proceeds from right to left.
'
' Parameter4: comparemethod - Optional - integer indicating binary or text
'        
' Result: integer - returns integer of the position of the first occurrence 
' of one string within another, starting from the right side of the 
' string. If the string is not found, the result is 0
'
' Quick Example:  Dim strString1 As String = "Hello World"
'    TextBox1.Text = InStrRev(strString1, "l").ToString() 'Returns 10
'
'****************************************************************************************
 
Partial Class _InStrRev
    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: 	InStrRev(stringcheck,stringmatch,start,comparemethod) "
 
        Dim strString1 As String = "Hello World"
 
 
 
 
        TextBox1.Text = Microsoft.VisualBasic.InStrRev(strString1, "l").ToString() 'Returns 10
 
 
    End Sub
End Class

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

< %@ Page Language="VB" AutoEventWireup="false" CodeFile="InStrRev.aspx.vb" Inherits="_InStrRev" %>
 
< !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 InStrRev
  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 InStrRev 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 InStrRev
  5. Click on Visual Basic in step 1 at the top of this page to copy code into code-behind InStrRev.aspx.vb
  6. Click on XML in step 2 above to copy code into web form InStrRev.aspx
  7. Right-click on InStrRev.aspx in solution explorer and select view in browser

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