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C# Substring Example - ASPNET CSharp Substring Syntax - Sample

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

Example Webform Code:

< %@ Page Language="C#" AutoEventWireup="true" CodeFile="Substring.aspx.cs" Inherits="StringManipulation_Substring" %>
 
< !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 />
    </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 Substring syntax in C-Sharp ASP.NET
 
//****************************************************************************************
// Example #1: Substring(startIndex[, length])
// Returns the string that starts at the specified position and has the specified
// length. If the length is not specified, all of the characters to the end are returned.
//****************************************************************************************
 
public partial class StringManipulation_Substring : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = "Example #1: Substring(startIndex[, length])   ";
 
        string strSubstringExample = "This is a test string";
        int intIndexSubstring = 0;
 
        // First find position of word test
        intIndexSubstring = strSubstringExample.IndexOf("test");
 
        // Get everything starting at "test" to end of string
        TextBox1.Text = strSubstringExample.Substring(intIndexSubstring);
 
    }
}
//----------------------------------------------------------------------------------------
//	Copyright © 2003 - 2011 Tangible Software Solutions Inc.
//	This class can be used by anyone provided that the copyright notice remains intact.
//
//	This class simulates the behavior of the classic VB 'Substring' function.
//----------------------------------------------------------------------------------------
public static class SimulateSubstring
{
    public static string Substring(string expression)
    {
        if (expression == null || expression.Length == 0)
            return string.Empty;
 
        string reversedString = string.Empty;
        for (int charIndex = expression.Length - 1; charIndex >= 0; charIndex--)
        {
            reversedString += expression[charIndex];
        }
        return reversedString;
    }
}

Example Connection String: