C-Sharp IndexOf Example | ASP.NET C# IndexOf Syntax | Source Code

Posted by on Friday, April 1, 2011 · Leave a Comment 

C-Sharp IndexOf Example | ASP.NET C# IndexOf Syntax | Source Code

Purpose: – Here is a that illustrates the .


View Other C-Sharp ASP.NET Source Code Examples ยป



Step 1: Click on C# to Cut-n-paste code into IndexOf.aspx.cs

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)
 
    }
}

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

< %@ 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>

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:
CS Syntax String Manipulation IndexOf

  1. Use Visual Web Developer 2010
  2. Create new web site;
    • Click File/New Web Site
    • Select ASP.NET Website Template
    • Select C-Sharp for Language
    • name of Web Site could be CSharp_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 IndexOf.aspx 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 IndexOf.aspx
  5. Click on C-Sharp in step 1 at the top of this page to copy code into web form IndexOf.aspx
  6. Click on XML in step 2 above to copy code into code-behind IndexOf.aspx.cs
  7. Right-click on IndexOf.aspx in solution explorer and select view in browser

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