CObj Example Syntax VB.NET ASP.NET | CObj | Source Code
CObj Example Syntax VB.NET ASP.NET | CObj | Source Code
Summary: – Illustrates using CObj with Source Code Syntax Example in VB.NET ASP.NET.
Purpose:
Converts any valid expression into Object data type
Syntax:
CObj(expression)
CObj(expression)
| Parameters | Description | expression | any valid expression |
|---|
| Result Data Type | Description | object | returns input as an object |
|---|
| Quick Example | Dim Object1 As Object = CObj(“Ideal”) TextBox1.Text = Object1 Returns Ideal |
|---|
Step 1: Click on Visual Basic to Cut-n-paste code into CObj.aspx.vb
Imports System Imports System.IO Imports System.Data '**************************************************************************************** ' Purpose: Converts any valid expression into Object data type ' ' Syntax: CObj(expression) ' ' Parameter1: expression - any valid expression ' ' Result: object - returns input as an object ' ' Quick Example: Dim Object1 As Object = CObj("Ideal") ' TextBox1.Text = Object1 ' Returns Ideal ' '**************************************************************************************** ' This example is from http://idealprogrammer.com Partial Class _CObj 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: CObj(""Ideal"") " Dim Object1 As Object = CObj("Ideal") TextBox1.Text = Object1 ' Returns Ideal Label2.Text = "Example #2: CObj(-3.4) " Dim Object2 As Object = CObj(-3.4) TextBox2.Text = Object2 ' Returns -3.4 Label3.Text = "Example #3: CObj(5.5)" Dim Object3 As Object = CObj(5.5) TextBox3.Text = Object3 ' Returns 5.5 End Sub End Class |
Step 2: Click on XML to Cut-n-paste code into CObj.aspx
< %@ Page Language="VB" AutoEventWireup="false" CodeFile="CObj.aspx.vb" Inherits="_CObj" %> < !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:
- 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:
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- 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 CObj 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 CObj
- Click on Visual Basic in step 1 at the top of this page to copy code into code-behind CObj.aspx.vb
- Click on XML in step 2 above to copy code into web form CObj.aspx
- Right-click on CObj.aspx in solution explorer and select view in browser
