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

Description: Illustrates using IndexOf with Source Code Syntax Example in VB.NET ASP.NET.

Example Webform Code:

< %@ Page Language="VB" AutoEventWireup="false" CodeFile="IndexOf.aspx.vb" Inherits="IndexOf" %>
 
< !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:label ID="Label2" runat="server" Text="Label"></asp:label><br />
         <asp:label ID="Label3" runat="server" Text="Label"></asp:label><br />
 
    </div>
    </form>
</body>
</html>

Example Code Behind:

Imports System
Imports System.IO
Imports System.Data
 
 
' This example is from http://idealprogrammer.com
' It shows how you can use IndexOf syntax in VB.NET ASP.NET
'****************************************************************************************
' Example #1: IndexOf(string[, startIndex][,count])
' Returns an integer that represents the position of the first occurrence of the
' specified number of characters. If you specify startIndex, that specifies
' where to start looking. If you specify count, that specifies how many characters to 
' to search past start. If the string is not found, this method returns -1
'****************************************************************************************
Partial Class IndexOf
    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: IndexOf(string[, startIndex][,count]) "
 
        Dim strIndexOfExample As String = "This is a test string"
 
        Label2.Text = strIndexOfExample.IndexOf("is").ToString() 'Returns 2
 
        Label3.Text = strIndexOfExample.IndexOf("xyz").ToString() 'Returns -1 (not found)
 
    End Sub
End Class

Example Connection String: