CBool Example Syntax VB.NET ASP.NET | CBool | Source Code
CBool Example Syntax VB.NET ASP.NET | CBool | Source Code
Summary: – Illustrates using CBool with Source Code Syntax Example in VB.NET ASP.NET.
Purpose:
Converts char, string, or numeric expression to boolean data type
Syntax:
CBool(expression)
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:
- Install Visual Web Developer 2010
- Install SQL Server Express
- Download Northwind and Pubs Databases
- Attach Northwind Database to Databases in Sql Express
- 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:
|
- Use Visual Web Developer 2010
- 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.
- Add New folder named “Functions”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: Functions
- Add New subfolder named “ConversionFunctions”
- Right-click Functions folder in solution explorer;
- add new folder;
- name of folder could be: ConversionFunctions
- Add New subfolder named “TypeConversionFunctions”
- Right-click ConversionFunctions folder in solution explorer;
- add new folder;
- name of folder could be: TypeConversionFunctions
- 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
- Click on Visual Basic in step 1 at the top of this page to copy code into code-behind CBool.aspx.vb
- Click on XML in step 2 above to copy code into web form CBool.aspx
- Right-click on CBool.aspx in solution explorer and select view in browser
