Substring() Example Syntax VB.NET ASP.NET | Substring() | Source Code

Posted by on Sunday, March 6, 2011 · Leave a Comment 

Substring Example Syntax VB.NET ASP.NET | Substring | Source Code

Summary: – Illustrates using with in VB.NET ASP.NET.

 *** 1. Download Source Code *** 
VB.NET Syntax StringManipulation Substring download Download Source Code for All VB ASP.NET Examples in One Project – source code for hundreds of VB.NET ASP.NET examples neatly organized in a single project. Check back often to download the latest version of the project with even more code samples.

 *** 2. Substring Syntax *** 


Purpose:
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.


Syntax:
inputString.Substring(startIndex[, length])

Parameters Description
inputString Required – string that you want to get
a part of.
startIndex Optional. specifies where to start. Zero-based.
length Optional. specifies how many characters to
to return past start. If no length is specified, rest of string
is returned.

Result Data Type Description
string 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.


 *** 3. Substring – Quick Example *** 
Dim strSubstringExample As String = “This is a test string”
TextBox1.Text = strSubstringExample.Substring(0,4) ‘Returns This

 *** 4. Substring – Full Example *** 

Substring Example Output Screenshot


VB.NET Syntax StringManipulation Substring screenshot


Step 1: Click on Visual Basic to Cut-n-paste code into Substring.aspx.vb

Imports System
Imports System.IO
Imports System.Data
 
' This example is from http://idealprogrammer.com
' It shows how you can use Substring syntax in VB.NET ASP.NET
 
'****************************************************************************************
' Purpose: 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. 
'
' Syntax: 	inputString.Substring(startIndex[, length])
'
' Parameter1: inputString - Required - string that you want to get
' a part of.
'
' Parameter2: startIndex - Optional. specifies where to start. Zero-based.
'
' Parameter3: length - Optional. specifies how many characters to 
' to return past start. If no length is specified, rest of string
' is returned.
'
' Result: string -  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.
'
' Quick Example:       Dim strSubstringExample As String = "This is a test string"
'  TextBox1.Text = strSubstringExample.Substring(0,4) 'Returns This
'
'****************************************************************************************
 
Partial Class _Substring
    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: Substring(startIndex[, length])   "
 
        Dim strSubstringExample As String = "This is a test string"
        Dim intIndexSubstring As Integer = 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)
 
 
 
 
    End Sub
End Class

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

< %@ Page Language="VB" AutoEventWireup="false" CodeFile="Substring.aspx.vb" Inherits="_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 />
          <h1><asp:label ID="Label2" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox2" runat="server"></asp:textbox><br />
          <h1><asp:label ID="Label3" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox3" runat="server"></asp:textbox><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:

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

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