VB.NET ASP.NET Left() Source Code Syntax Example

Posted by on Saturday, March 5, 2011 · Leave a Comment 

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

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

 *** 1. Download Source Code *** 
VB.NET Syntax StringManipulation Left 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. Left Syntax *** 


Purpose:
Returns a string containing a specified number of characters from the left
side of a string.


Syntax:
Left(str As String, Length As Integer) As String

Parameters Description
str Required – String expression from which characters will be returned.
Length Required – Specifies number of characters to return.

Result Data Type Description
string Returns a string containing a specified number of characters from the left
side of a string.


 *** 3. Left – Quick Example *** 
TextBox1.Text = Left(“Ideal Programmer”, 5) ‘ Returns Ideal

 *** 4. Left – Full Example *** 

Left Example Output Screenshot


VB.NET Syntax StringManipulation Left screenshot


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

Imports System
Imports System.IO
Imports System.Data
 
 
 
 
' This example is from http://idealprogrammer.com
' It shows how you can use Left syntax in VB.NET ASP.NET
'****************************************************************************************
' Purpose:  Returns a string containing a specified number of characters from the left
' side of a string.
'
' Syntax: 	Left(str As String, Length As Integer) As String
'
' Parameter1: str - Required - String expression from which characters will be returned.
'
' Parameter2: Length - Required - Specifies number of characters to return.
'
' Result: string - Returns a string containing a specified number of characters from the left
' side of a string.
'
' Quick Example:   TextBox1.Text = Left("Ideal Programmer", 5) ' Returns Ideal
'
'****************************************************************************************
Partial Class _Left
    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: 	Left(str As String, Length As Integer) As String "
 
        Dim strLeftExample As String = "This is a test string"
 
        TextBox1.Text = Microsoft.VisualBasic.Left("Ideal Programmer", 5) ' Returns Ideal
 
 
    End Sub
End Class

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

< %@ Page Language="VB" AutoEventWireup="false" CodeFile="Left.aspx.vb" Inherits="_Left" %>
 
< !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 Left
  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 Left 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 Left
  5. Click on Visual Basic in step 1 at the top of this page to copy code into code-behind Left.aspx.vb
  6. Click on XML in step 2 above to copy code into web form Left.aspx
  7. Right-click on Left.aspx in solution explorer and select view in browser

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