IsNullorEmpty() Example Syntax VB.NET ASP.NET | IsNullorEmpty() | Source Code
Posted by asp.net videos on Sunday, March 6, 2011 · Leave a Comment
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IsNullorEmpty Example Syntax VB.NET ASP.NET | IsNullorEmpty | Source Code
Summary: – Illustrates using IsNullorEmpty with Source Code Syntax Example in VB.NET ASP.NET.
*** 2. IsNullorEmpty Syntax ***
Purpose:
Returns a Boolean value that indicates if the string is Null or Empty.
Syntax:
String.IsNullorEmpty(stringtocheck)
| Parameters | Description |
|---|
stringtocheck | Required – string that you want to check
whether it is null or empty |
| Result Data Type | Description |
|---|
Boolean | Returns a Boolean value that indicates if the string is Null or Empty. |
*** 3. IsNullorEmpty – Quick Example *** |
|---|
Dim strIsNullorEmptyExample As String = "This is a test string"
TextBox1.Text = String.IsNullOrEmpty(strIsNullorEmptyExample) 'Returns False
|
*** 4. IsNullorEmpty – Full Example *** IsNullorEmpty Example Output Screenshot
Step 1: Click on Visual Basic to Cut-n-paste code into IsNullorEmpty.aspx.vb
| Imports System | Imports System.IO | Imports System.Data | | ' This example is from http://idealprogrammer.com | ' It shows how you can use IsNullorEmpty syntax in VB.NET ASP.NET | | '**************************************************************************************** | ' Purpose: Returns a Boolean value that indicates if the string is Null or Empty. | ' | ' Syntax: String.IsNullorEmpty(stringtocheck) | ' | ' Parameter1: stringtocheck - Required - string that you want to check | ' whether it is null or empty | ' | ' Result: Boolean - Returns a Boolean value that indicates if the string is Null or Empty. | ' | ' Quick Example: Dim strIsNullorEmptyExample As String = "This is a test string" | 'TextBox1.Text = String.IsNullOrEmpty(strIsNullorEmptyExample) 'Returns False | ' | '**************************************************************************************** | | Partial Class _IsNullorEmpty | 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: String.IsNullorEmpty " | | Dim strIsNullorEmptyExample As String = "This is a test string" | | TextBox1.Text = String.IsNullOrEmpty(strIsNullorEmptyExample) 'Returns False | | | | | End Sub | End Class | |
Step 2: Click on XML to Cut-n-paste code into IsNullorEmpty.aspx
| < %@ Page Language="VB" AutoEventWireup="false" CodeFile="IsNullorEmpty.aspx.vb" Inherits="_IsNullorEmpty" %> | | < !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 IsNullorEmpty 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 IsNullorEmpty
- Click on Visual Basic in step 1 at the top of this page to copy code into code-behind IsNullorEmpty.aspx.vb
- Click on XML in step 2 above to copy code into web form IsNullorEmpty.aspx
- Right-click on IsNullorEmpty.aspx in solution explorer and select view in browser
|
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