C# IndexOf Example | IndexOf | Source Code

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C# IndexOf Example | IndexOf | Source Code

Purpose: – Illustrates the C# Syntax for IndexOf.

 C# | 
 copy code |
?
 
using System;
public class clsIndexOf
{
 
    public void Main()
    {
 
 
 
        //****************************************************************************************
        // 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
        //****************************************************************************************
 
        Console.WriteLine("Example #1: IndexOf(string[, startIndex][,count]) ");
 
        string strIndexOfExample = "This is a test string";
 
        Console.WriteLine(strIndexOfExample.IndexOf("is")); //Returns 2
 
        Console.WriteLine(strIndexOfExample.IndexOf("xyz")); //Returns -1 (not found)
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        //Prevent console from closing before you press enter
        Console.ReadLine();
 
    }
 
 
}
 

 C# | 
 copy code |
?
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace CSharp_Syntax
{
    class Program
    {
        static void Main(string[] args)
        {
 
 
            clsIndexOf myIndexOf = new clsIndexOf();
            myIndexOf.Main();
 
        }
    }
}
 
 
 

1. Install C# (Express or Standard Edition)
2. Install SQL Server Express
3. Download Northwind and pubs Database
4. Attach Northwind Database to Databases in Sql Express
5. Attach pubs Database to Databases in Sql Express

Notes:

• Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
• You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Program.cs

Instructions:

1. Use C# 2010 Express or Standard Edition
2. Create new project;
   • Click File/New Project
   • Select Console Application Template
   • Select C# for Language
   • name of project could be CSharp_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 Class Named clsIndexOf to StringManipulation folder
   • Right-click StringManipulation folder;
   • add new item;
   • Select class
   • Class name could be clsIndexOf
5. Click on C# in code in step 1 at top of page to copy code into clsIndexOf.cs
6. Click on C# in step 2 at top of page to copy code into Program.cs
7. Click green arrow or press F5 to run program

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