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C# IndexOf Example - ASPNET CSharp IndexOf Syntax - Sample

Description: Here is a IndexOf Example that illustrates the C# Syntax in ASP.NET.

Example Webform Code:

< %@ Page Language="C#" AutoEventWireup="true" CodeFile="IndexOf.aspx.cs" Inherits="StringManipulation_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:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
// This example is from http://idealprogrammer.com
// It shows how you can use IndexOf syntax in C-Sharp 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
//****************************************************************************************
 
 
public partial class StringManipulation_IndexOf : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = "Example #1: IndexOf(string[, startIndex][,count]) ";
 
        string strIndexOfExample = "This is a test string";
 
        Label2.Text = strIndexOfExample.IndexOf("is").ToString(); //Returns 2
 
        Label3.Text = strIndexOfExample.IndexOf("xyz").ToString(); //Returns -1 (not found)
 
    }
}

Example Connection String: