.Net 4's new IsNullOrWhiteSpace method
February 23, 2010
posted by Brad Kingsley
.Net 4 (still in beta right now) has a handy new method that can analye a string and return where it is null or just whitespace versus other text. Here's a quick sample:
ScratchPage.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ScratchPage.aspx.cs" Inherits="ScratchPage" %>
<!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>
<asp:TextBox ID="textBox" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
<br />
<asp:Label ID="Label1" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
ScratchPage.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class ScratchPage : System.Web.UI.Page
{
protected void Button1_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(textBox.Text))
{
Label1.Text = "The text box is null or has only white space.";
}
else
{
Label1.Text = "There is a non-null, non-white-space value in the text box";
}
}
}
