[ASP.NET 2.0] Using Buttons! with C# - Computer Programmers, Programming Forum

Mitch · #1 04-20-2006

Please read this if you're just starting ASP.NET: Hello World!

Last time, I showed you an event handler for on Page Load, well now I'm going to show you how to do soemthing for on button click!

Get your aspx started:

Code:

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
<head>
    <title>Buttons!</title>
</head>
<body>
<form runat="server">

</form>
</body>
</html>

Ok Now let's set up a textbox, label and button:

Code:

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
<head>
    <title>Buttons!</title>
</head>
<body>
<form runat="server">
<asp:TextBox id="text1" runat="server" />
<asp:Button id="button1" onclick="calculate_Click" runat="server" />
<asp:Label id="label1" runat="server" />
</form>
</body>
</html>

Notice the "onclick="", this is going to be a key feature here, it will be the name of the method we are about to put in between the head tags.

Code:

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
<head>
    <title>Buttons!</title>
    <script runat="server">
        void calculate_Click (object sender, EventArgs e)
        {
            label1.Text = "Hello, "+text1.Text+".";
        }
    </script>
</head>
<body>
<form id="Form1" runat="server">
Name: <asp:TextBox id="text1" runat="server" />
<asp:Button id="button1" text="Enter" onclick="calculate_Click" runat="server" />
<br />
<span style="font-size: 12px; font-family:verdana;"><asp:Label id="label1" runat="server" /></span>
</form>
</body>
</html>

There, we took the text from the textbox, and put it in the label.

Well there's buttons from the basics for you!

Reaper · #2 04-20-2006

Weeee thanks. I'm goofing around and added a thing that says Enter a Name, if the text box is empty. Thanks for the intro. I'll look more into this.

Mitch · #3 04-20-2006

No problem!

I tried using
if (text1.Text == "") {}
but no such luck, I remember it saying something about converting to a string/int or something

, I'll have to look into it..

I'm also trying to find out how to delete a control or alteast hide it off the screen as you don't need the textbox there again after you have a valid name entered do you?

The closest I've got is text1.Enabled = false;

which disables it's usage, but doesn't hide it.

Reaper · #4 04-20-2006

Hmm. I'll look into this. Also, I use if(text1.Text == "" && text1.Text == " ") {}. How would I do it if the whole textbox was empty not just empty or 1 space?