Web Development

2-Oct-02 9:22

Server.MachineName?

Paul

Re: Getting Server Name

Jason Weibel4-Oct-02 2:40

Jason Weibel

4-Oct-02 2:40

Thanks that pointed me in the right direction. The following is what I ended up using. Big Grin | :-D

Dim ServerUtility As System.Web.HttpServerUtility
ServerUtility.MachineName

Jason W.

Re: Getting Server Name

Paul Riley4-Oct-02 3:14

CheckBoxList (ListItem.Selected)

4-Oct-02 3:14

Sure, that should work, but in the same way as "Request" is a predefined HttpWebRequest, "Server" is a predefined HttpServerUtility. There should never be a reason to define a new one.

Paul

leppie2-Oct-02 2:39

2-Oct-02 2:39

Hi all

I have a problem with selected items Dead | X|

I do this :

foreach (ListItem item in CheckBoxList1.Items)
{
  if (item.Selected) //this always returns false, why???
    //do my stuff
}

I have noticed the IsDirty is allways true for each item. What am I doing wrong?

Thanx in advance Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!
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Paul Riley2-Oct-02 5:14

2-Oct-02 5:14

I've just tried this out, thinking it must be something simple but I have exactly the same problem.

In addition, if you set it to AutoPostBack and give it a handler for "SelectedIndexChanged" (because that's how the example in MSDN works)then it posts back but doesn't call the event.

Bizarre.

Have you thought about using normal Checkboxes? If you need to bind it, try a DataRepeater. A bit naff but it's the best I've got.

Paul

leppie2-Oct-02 8:59

2-Oct-02 8:59

Paul Riley wrote:
I've just tried this out, thinking it must be something simple but I have exactly the same problem.

Guess you made the same mistake as me Smile | :)

I found out what I was doing wrong. In my page load event i was creating the checkboxes from an enum, BUT page load gets fired again before button click is handled (something I guess I have to keep in mind all the time). This was my solution:

private bool setup = true;

private void Page_Load(object sender, System.EventArgs e)
{
	try 
	{
		setup = (bool) ViewState["setup"];
	} 
	catch (System.NullReferenceException){}
	if (setup) SetupPage();
}

private void SetupPage()
{
	//do my stuff
	setup = false;
	ViewState["setup"] = setup;
}

Read setup as setup? (Do you want to setup?).... Smile | :)

It looks a bit in reverse, but my logic prefers it. Maybe I should call it dosetup? Smile | :)

Hope this is the same problem as you have, else I'm clueless. Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!
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Paul Riley2-Oct-02 9:20

2-Oct-02 9:20

leppie wrote:
Hope this is the same problem as you have, else I'm clueless.

Similar. I had it Databound at the bottom of a page I'd already written and this.Databind() (too lazy to databind 8 dropdownlists and a textbox) in the Page_Load.

You have no idea how many times I've fallen into this trap of Page_Load running first. It seems so illogical. Roll eyes | :rolleyes:

Paul

leppie2-Oct-02 9:37

2-Oct-02 9:37

Paul Riley wrote:
You have no idea how many times I've fallen into this trap of Page_Load running first. It seems so illogical.

Depends how you look at it, this is probably some nasty remains from ASP, and hopefully in ASP.NET v2, us developer wont have to write a single line of ASP code.

Currently, I'm succeeding in the site I'm doing without writing a single line of ASP code in html , besides the code inserted automatically by the VS designer. I find it is difficult to keep 2 sides in mind all the time.

Cheers Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!
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Paul Riley2-Oct-02 9:54

2-Oct-02 9:54

leppie wrote:
Depends how you look at it, this is probably some nasty remains from ASP

Well, ASP didn't have events, so I don't see how it can be. Someone has sat there and considered this and decided that Page_Load should execute every time and always before any event code. That makes no sense. When the button is pressed, the event that relates to that should execute; then the page should be loaded.

leppie wrote:
hopefully in ASP.NET v2, us developer wont have to write a single line of ASP code.

I don't get this. If you don't want to do any processing at the server side then there's no need to use ASP(.NET) at all.

What does your site do that doesn't require much code? I'm currently writing a sign-up site for a tournament (we're expecting upwards of 500 people, some will be bunched into teams of 7 or more, some will need to be able to sign up in small groups, find other small groups and then combine them into a team).

I've been doing a lot of coding for that.

To be fair, I overcomplicated things by doing all database processing in WebServices, so that I can later write programs to do the same thing, but even without that it would be a lot of code.

Paul

leppie2-Oct-02 10:17

2-Oct-02 10:17

Paul Riley wrote:
leppie wrote:
hopefully in ASP.NET v2, us developer wont have to write a single line of ASP code.

OK, maybe I understood it wrong, but I thought that ASP code, is embedded ASP commands and syntax within HTML, where I am purely trying to "push" everything to the client via ASP.NET in C#. Unsure | :~

I do totally agree with you! I would prefer everything server-side exclusively. Big Grin | :-D

Give them a chance! Do it for the kittens, dear God, the kittens!
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Paul Riley2-Oct-02 10:31

2-Oct-02 10:31

Sorry, I missed you point completely there, didn't I? Blush | :O

In that case I'm with you completely; the only code I have embedded in the HTML is databinding stuff which really does belong there. It'd be evil if you had to look back to your code to see what data was bound to what control. Dead | X|

Paul

leppie2-Oct-02 11:23

2-Oct-02 11:23

Paul Riley wrote:
the only code I have embedded in the HTML is databinding stuff which really does belong there

I just get values from a dataset Smile | :)

No need to even to do databinding in HTML.

Infact, Templated Databound Controls looks waaaaaaayyyyy to complicated for my needs, but it mite be usefull for the control designer (who wishes to make distributable controls). BTW, does a property need a special attribute to become databindable?

Cheers Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!
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Paul Riley2-Oct-02 11:55

2-Oct-02 11:55

leppie wrote:
I just get values from a dataset No need to even to do databinding in HTML.

Very true and I did my first site that way, but DataBinding is very powerful and can remove tons of code from the CodeBehind.

For example, if you want to build a DropDownList from a DataSet, you can run through the dataset and add the items in a loop. Or you can drop the DataSet and the DropDownList onto your page, go into the Data properties, select the dataset, the value field and the text field and you're done (except one line of code to tell it when to DataBind).

Not too much of a saving if you only have one DropDownList. But I have one page with eight DropDownLists all containing a list of players for a team, so the team can assign a captain and the 7 players.

In that scenario, I only need to drop one DataSet onto the form and I can bind all 8 DropDownLists to it. A single this.DataBind() and it's all done.

leppie wrote:
BTW, does a property need a special attribute to become databindable?

Yeah, I think it's Bindable(true). I haven't written a custom control that needs databinding as yet but it looks simple enough.

Paul

leppie2-Oct-02 12:08

2-Oct-02 12:08

Paul Riley wrote:
Yeah, I think it's Bindable(true). I haven't written a custom control that needs databinding as yet but it looks simple enough.

It'll try that Smile | :)

Thanx! Unfortunately mine is all custom rendering , basically an object and webcontrol in one. So my properties mite just need that Smile | :)

Cheers

Give them a chance! Do it for the kittens, dear God, the kittens!
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Paul Riley2-Oct-02 12:07

2-Oct-02 12:07

Incidentally, bound datagrids are even cooler. I have one page that needs to display a list of players in a dataset.

The first column needs to contain the name which is also a link to another page, passing the player id as a parameter.

The second column needs to contain the email address which is also a mailto: link.

The third column should be a location. It took me about 15 minutes to knock that together with the following code:

<asp:datagrid id=dgPlayer runat="server" Width="100%" DataMember="Player" DataSource="<%# dsPlayer %>" AutoGenerateColumns="False" DataKeyField="PlayerID">
	<HeaderStyle Font-Bold="True"></HeaderStyle>
	<Columns>
		<asp:TemplateColumn ItemStyle-Width="50%">
			<HeaderTemplate>
				Player <i>(Click to Edit)</i>
			</HeaderTemplate>
			<ItemTemplate>
				<a href='editplay.aspx?guid=<%# DataBinder.Eval(Container.DataItem, "PlayerID" ) %>'>
				<%# DataBinder.Eval(Container.DataItem, "FullName" ) %>
				</a>
			</ItemTemplate>
		</asp:TemplateColumn>
		<asp:TemplateColumn ItemStyle-Width="25%">
			<HeaderTemplate>
				Email
			</HeaderTemplate>
			<ItemTemplate>
				<a href='mailto:<%# DataBinder.Eval(Container.DataItem, "Email" ) %>'>
				<%# DataBinder.Eval(Container.DataItem, "Email" ) %>
				</a>
			</ItemTemplate>
		</asp:TemplateColumn>
		<asp:BoundColumn DataField="Location" HeaderText="Location" ItemStyle-Width="25%"></asp:BoundColumn>
	</Columns>
</asp:datagrid>

It might have taken me a hell of a lot longer to do this using code. DataBinding does seem complicated when you first come to play with it but, like most things in .NET, once you've done it a couple of times it's great.

Paul

leppie2-Oct-02 12:29

2-Oct-02 12:29

You can even just bind the data without that code, by just using the Property Builder and you get this :

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="WebApplication1.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
	<HEAD>
		<title>WebForm1</title>
		<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
		<meta name="CODE_LANGUAGE" Content="C#">
		<meta name="vs_defaultClientScript" content="JavaScript">
		<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
	</HEAD>
	<body MS_POSITIONING="GridLayout">
		<form id="Form1" method="post" runat="server">
			<asp:DataGrid id=DataGrid1 style="Z-INDEX: 101; LEFT: 10px; POSITION: absolute; TOP: 11px" runat="server" Width="720px" Height="247px" DataSource="<%# dataSet11 %>" DataKeyField="ID" AllowSorting="True" DataMember="Users">
			</asp:DataGrid>
		</form>
	</body>
</HTML>

and in the page load event:

oleDbDataAdapter1.Fill(dataSet11.Users);
DataBind();

My HTML pages look similar to this. Dump one container control, and preform all the rest of tasks at server-side Smile | :)

I must say the DtaGrid is extremely well designed, but can be a bit limiting, hence my need to have made a custom control.

Give them a chance! Do it for the kittens, dear God, the kittens!
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Paul Riley2-Oct-02 12:35

2-Oct-02 12:35

leppie wrote:
by just using the Property Builder and you get this :

Unfortunately the <pre> tag isn't very smart when it comes to asp: tags. So I can't actually read what you've written there Poke tongue | ;-P

(I had to copy to notepad and do a few mass replaces)

leppie wrote:
I must say the DtaGrid is extremely well designed, but can be a bit limiting, hence my need to have made a custom control.

Limiting how? I haven't found anything I can't do with a datagrid yet (at least nothing that I'd want to do Big Grin | :-D

)

Paul

leppie2-Oct-02 12:59

2-Oct-02 12:59

Paul Riley wrote:
Limiting how? I haven't found anything I can't do with a datagrid yet (at least nothing that I'd want to do )

It can only hold a row of data Frown | :(

Sometimes you need to communicate multiple lines of info to the client if the data is too "wide" for the page. Take a very simple forum as an example. OOhh just had an idea, a forum of one-liners Laugh | :laugh:

. I'm getting tired Sleepy | :zzz:

CP should really have an IRC server or some chat rooms that are logged and moderated, taking useful snippets and info and adding that to a sticky FAQ thread in each forums. OK, maybe I'm just asking for wwaaayyy too much! I would assume the Lounge would be chaos.

Cheers Smile | :)

Give them a chance! Do it for the kittens, dear God, the kittens!
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Paul Riley2-Oct-02 13:09