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IsNullorEmpty() Example Syntax VB.NET ASP.NET - IsNullorEmpty() - Source Code

Description: Illustrates using IsNullorEmpty with Source Code Syntax Example in VB.NET ASP.NET.

Example Webform Code:

< %@ 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 />
 
 
 
 
    </div>
    </form>
</body>
</html>

Example Code Behind:

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
 
'****************************************************************************************
' Example #1: String.IsNullorEmpty(string)
' Returns a Boolean value that indicates if the string is Null or Empty. 
'****************************************************************************************
 
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

Example Connection String: