VB.NET ASP.NET Len() Source Code – Len() Example Syntax

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

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

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

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


Purpose:
Returns the number of characters in a string.


Syntax:
Len(string)

Parameters Description
string Required – String of which you want to know the length

Result Data Type Description
integer Returns the number of characters in a string.


 *** 3. Len – Quick Example *** 
Dim strField As String = ” This “
TextBox1.Text = Len(strField) ‘Returns 6 – spaces are counted

 *** 4. Len – Full Example *** 

Len Example Output Screenshot


VB.NET Syntax StringManipulation Len screenshot


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

Imports System
Imports System.IO
Imports System.Data
 
 
 
 
' This example is from http://idealprogrammer.com
' It shows how you can use Len syntax in VB.NET ASP.NET
'****************************************************************************************
' Purpose:  Returns the number of characters in a string. 
'
' Syntax: 	Len(string)
'
' Parameter1: string - Required - String of which you want to know the length
'
' Result: integer - Returns the number of characters in a string. 
'
' Quick Example:    Dim strField As String = " This "
' TextBox1.Text = Len(strField) 'Returns 6 - spaces are counted
'
'****************************************************************************************
 
Partial Class _Len
    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: Len(strField) "
 
        Dim strField As String = " This "
 
        TextBox1.Text = Microsoft.VisualBasic.Len(strField) 'Returns 6 - spaces are counted
 
 
    End Sub
End Class

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

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

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