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

Posted by on Saturday, May 14, 2011 · Leave a Comment 

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

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


View Other VB.NET ASP.NET Source Code Examples


Purpose:
Converts boolean, date, and numeric data types into String data type

Syntax:
CStr(expression)

Parameters Description
expression boolean, date, and numeric data types

Result Data Type Description
String 1. If boolean, returns string “True” or “False”
2. If date, returns A string containing a date value (date and time) in the short date
format of your system
3. If number, returns a string representing the number

Quick Example
Dim myBool As Boolean = True
Dim String1 As String = CStr(myBool)
TextBox1.Text = String1 Returns True

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

Imports System
Imports System.IO
Imports System.Data
 
'*****************************************************************************************
' Purpose: Converts boolean, date, and numeric data types into String data type
' 
' Syntax: 	CStr(expression)
'  
' Parameter1: expression - boolean, date, and numeric data types
'
' Result: String - 1. If boolean, returns string "True" or "False" 
' 2. If date, returns A string containing a date value (date and time) in the short date 
' format of your system
' 3. If number, returns a string representing the number
'
' Quick Example: Dim myBool As Boolean = True
' Dim String1 As String = CStr(myBool)
' TextBox1.Text = String1 ' Returns True
'
'
'****************************************************************************************
' This example is from http://idealprogrammer.com
 
 
Partial Class _CStr
    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: 	 CStr(myBool) "
 
        Dim myBool As Boolean = True
        Dim String1 As String = CStr(myBool)
 
        TextBox1.Text = String1 ' Returns True
 
        Label2.Text = "Example #2: 	CStr(myDate) "
 
        Dim myDate As Date = "10/21/2011"
        Dim String2 As String = CStr(myDate)
 
        TextBox2.Text = String2 ' Returns 10/21/2011
 
        Label3.Text = "Example #3: 	CStr(5.5)"
 
        Dim String3 As String = CStr(5.5)
 
        TextBox3.Text = String3 ' Returns 5.5
 
 
    End Sub
End Class

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

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

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