A simple example that shows how to work the TextBox, Button, and Label in an ASP.NET page
<%@ Page Language="C#" %>
<!DOCTYPE html>
<script runat="server">
protected void Button_Click(object sender, EventArgs e)
{
if (TextBoxName.Text!="")
LabelMessage.Text = "Hello " + TextBoxName.Text;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>ASP.NET Demo: TextBox, Button, Label</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Enter your name
<asp:TextBox ID="TextBoxName" runat="server"></asp:TextBox>
<asp:Button ID="Button" runat="server" Text="Click me" OnClick="Button_Click" />
<br />
<br />
<asp:Label ID="LabelMessage" runat="server" Text=""></asp:Label>
</div>
</form>
</body>
</html>
When the page is loaded for the first time LabelMessage not displays null.
When the Button is clicked, the Button_Click method is verified the contents of TexBoxName, if it is not null and contains Lisa for example, the text of LabelMessage is set with the following message: Hello Lisa
Category: ASP.NET