VB.NET ASP.NET Left() Source Code Syntax Example
Posted by asp.net videos on Saturday, March 5, 2011 · Leave a Comment
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Left Example Syntax VB.NET ASP.NET | Left | Source Code
Summary: – Illustrates using Left with Source Code Syntax Example in VB.NET ASP.NET.
*** 2. Left Syntax ***
Purpose:
Returns a string containing a specified number of characters from the left
side of a string.
Syntax:
Left(str As String, Length As Integer) As String
| Parameters | Description |
|---|
str | Required – String expression from which characters will be returned. | | Length | Required – Specifies number of characters to return. |
| Result Data Type | Description |
|---|
string | Returns a string containing a specified number of characters from the left
side of a string. |
*** 3. Left – Quick Example *** |
|---|
TextBox1.Text = Left("Ideal Programmer", 5) ' Returns Ideal
|
*** 4. Left – Full Example *** Left Example Output Screenshot
Step 1: Click on Visual Basic to Cut-n-paste code into Left.aspx.vb
| Imports System | Imports System.IO | Imports System.Data | | | | | ' This example is from http://idealprogrammer.com | ' It shows how you can use Left syntax in VB.NET ASP.NET | '**************************************************************************************** | ' Purpose: Returns a string containing a specified number of characters from the left | ' side of a string. | ' | ' Syntax: Left(str As String, Length As Integer) As String | ' | ' Parameter1: str - Required - String expression from which characters will be returned. | ' | ' Parameter2: Length - Required - Specifies number of characters to return. | ' | ' Result: string - Returns a string containing a specified number of characters from the left | ' side of a string. | ' | ' Quick Example: TextBox1.Text = Left("Ideal Programmer", 5) ' Returns Ideal | ' | '**************************************************************************************** | Partial Class _Left | 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: Left(str As String, Length As Integer) As String " | | Dim strLeftExample As String = "This is a test string" | | TextBox1.Text = Microsoft.VisualBasic.Left("Ideal Programmer", 5) ' Returns Ideal | | | End Sub | End Class | |
Step 2: Click on XML to Cut-n-paste code into Left.aspx
| < %@ Page Language="VB" AutoEventWireup="false" CodeFile="Left.aspx.vb" Inherits="_Left" %> | | < !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: - 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 "StringManipulation"
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: StringManipulation
- Add Web Form Named Left 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 Left
- Click on Visual Basic in step 1 at the top of this page to copy code into code-behind Left.aspx.vb
- Click on XML in step 2 above to copy code into web form Left.aspx
- Right-click on Left.aspx in solution explorer and select view in browser
|
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