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

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

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



Purpose:
Converts char, string, or numeric expression to boolean data type

Syntax:
CBool(expression)

Parameters Description
expression char, string, or numberic expression

Result Data Type Description
Boolean is false if input converts to 0; otherwise, it is true

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

Imports System
Imports System.IO
Imports System.Data
 
'****************************************************************************************
' Purpose: Converts char, string, or numeric expression to boolean data type
'
' Syntax: 	CBool(expression)
'
' Parameter1: expression - char, string, or numberic expression
'
' Result: Boolean - is false if input converts to 0; otherwise, it is true
'
'****************************************************************************************
' This example is from http://idealprogrammer.com
' It shows how you can use CBool syntax in VB.NET ASP.NET
 
'****************************************************************************************
' Example #1: CBool(value) - Returns a string or character in uppercase.
'****************************************************************************************
 
Partial Class _CBool
    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: 	CBool(string) "
 
        Dim strField As String = "True"
        TextBox1.Text = CBool(strField) 'Returns True
 
        Label2.Text = "Example #2: 	CBool(integer) "
 
        Dim intField As Integer = 1
        TextBox2.Text = CBool(intField) 'Returns True
 
 
 
    End Sub
End Class

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

< %@ Page Language="VB" AutoEventWireup="false" CodeFile="CBool.aspx.vb" Inherits="_CBool" %>
 
< !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 />
 
 
 
 
    </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 Functions CBool
  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 “Functions”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: Functions
  4. Add New subfolder named “ConversionFunctions”
    • Right-click Functions folder in solution explorer;
    • add new folder;
    • name of folder could be: ConversionFunctions
  5. Add New subfolder named “TypeConversionFunctions”
    • Right-click ConversionFunctions folder in solution explorer;
    • add new folder;
    • name of folder could be: TypeConversionFunctions
  6. Add Web Form Named CBool to TypeConversionFunctions folder
    • Right-click TypeConversionFunctions folder;
    • add new item;
    • Select Web Form
    • Check place code behind in separate file
    • Web Form name could be CBool
  7. Click on Visual Basic in step 1 at the top of this page to copy code into code-behind CBool.aspx.vb
  8. Click on XML in step 2 above to copy code into web form CBool.aspx
  9. Right-click on CBool.aspx in solution explorer and select view in browser