ASP.NET

Re: Inserting a custom control onto a web form

28-Apr-06 7:07

So I created a custom control.

I right click the toolbox, chose Add and it added my newly made custom control. That workd and its name appears fine on the toolbox.

So I drag the control on the form.

it produced this register tag
<%@ Register Assembly="WebControls" Namespace="ForumWebControls" TagPrefix="cc1"%>

and this html
<cc1:ForumControl runat="server"></cc1:ForumControl>

But it says the following error.
Error 11 Unknown server tag 'cc1:ForumControl'.
Error 11 Element 'ForumControl' is not a known element. This can occur if there is a compilation error in the Web site.

Does someone know something I did wrong? Do I need to register the schema or something? This works in VS2003, why not VS2005?

Thanks,
Nick

1 line of code equals many bugs. So don't write any!!

Ista28-Apr-06 9:14

SqlDataSource control and null values

28-Apr-06 9:14

Nevermind. I added it to my web.config and it works now

1 line of code equals many bugs. So don't write any!!

grandypeace28-Apr-06 6:44

grandypeace

28-Apr-06 6:44

I wasn't sure where to put this question, but I think the issue is based on what happens after I've queried the database, and what an ASP.net control is doing with the data.

I have a SqlDataSource linked to a Details View. It queries the DB (via a proc) to retreive a bunch of data about a specific record.

I'm having trouble with it, though. Sometimes certain values will return null. The proc left-joins several tables, and sometimes there won't be any results from the joined table (the "left" table is member information. The right table is image information, if there is a picture associated with that member).

I'm getting a Format Exception here (we're in the middle of an edit operation):

<br />
DataRowView rowView = (DataRowView)dvMember.DataItem;<br />
<br />
if (rowView["ImageID"] != null || rowView["ImageID"] != System.DBNull.Value)<br />
    imageID = Int64.Parse(rowView.Row["ImageID"].ToString());<br />

Actual error message:

"System.FormatException: Input string was not in a correct format"

if the member in question has no image (this will be used for determining what I need to do for the rest of my updating). I don't know what I need to check for here. I thought null or DBNull would handle it. No dice. So what happens when you pull information from the DB into a datasource? What does it do to null values? Or is my DetailsView doing something to them (tricksome, they can be). I can't seem to find this information anywhere, and my good ADO books are all at home.

minhpc_bk30-Apr-06 0:45

minhpc_bk

30-Apr-06 0:45

Hi there,
IMO, the simple way to figure out the root cause is to debug your application and have a look at the rowView.Row["ImageID"], then you can see what is the real value of it. Btw, when do you want to run the posted sample code? Does it run when you select data to the DetailsView control or when you update data?

grandypeace30-Apr-06 4:46

grandypeace

30-Apr-06 4:46

I Forgot to mention that, sorry. The watch window is showing that rowView.Row["ImageID"] is null. This is contributing to my bafflement.

What happens on the page is this: user enters a search term in a text box, his search button. A Grid View is populated with matches for that search term. Basic information - name & email - is shown. There's a "view details" link button that makes dvMember visible when clicked, and populates dvMember with all of the individual information about that specific user (and we're doing all the retreival and binding right there). There's a datasource binding dvMember to gvMember & the selected index property (iirc, I'll double check at work monday).

In hindsight, I wouldn't use a second datasource there - part of the goal on this project for me was try and get comfortable with the controls. Since updates and deletes here are multi-table, I think the datasource is just in the way for the most part.

minhpc_bk30-Apr-06 5:12

minhpc_bk

30-Apr-06 5:12

+ A quick fix is to replace the or (||) operator in the if condition with the and (&&) operator.

grandypeace wrote:
There's a datasource binding dvMember to gvMember & the selected index property (iirc, I'll double check at work monday).

Yes, it should be the way you go.

grandypeace wrote:
Since updates and deletes here are multi-table, I think the datasource is just in the way for the most part.

Because it's related to multiple tables, you may consider using the ObjectDataSource control.

css for a hyperlink column

grandypeace30-Apr-06 6:17

grandypeace

30-Apr-06 6:17

minhpc_bk wrote:
+ A quick fix is to replace the or (||) operator in the if condition with the and (&&) operator.

Ugh, that's a stupid one to get myself into.

minhpc_bk wrote:
Because it's related to multiple tables, you may consider using the ObjectDataSource control.

Well, I think if I was doing it all over again I'd probably do that. This is a small project - and it seemed to me at the start that doing actual objects would be a waste of time. Of course, once I got through most of it I had an additional requirement dropped on me - I had to map some of the data into a database in another application (so my multi-table operations became multi-table, multi-DB). I would have saved myself some trouble had I started differently. Live and learn.

aurora8328-Apr-06 6:28

aurora83

28-Apr-06 6:28

I have a style defined for the tag . But I want to use a different style for the hyperlink column.

Have tried:

<asp:hyperlinkcolumn itemstyle-cssclass="table_text">

But it still uses the style.

I read in one article that the some classes do not derived from the WebControl class, and therefore do not have a CssClass property. Is this the case for me? What can I do?

Re: css for a hyperlink column

aurora8328-Apr-06 6:29

aurora83

28-Apr-06 6:29

This is what i tried:

<asp:HyperLinkColumn Text="View Details" ItemStyle-CssClass="table_text"></asp:HyperLinkColumn>

Add Checkbox Event handler dynamically

hasanali0028-Apr-06 5:37

hasanali00

28-Apr-06 5:37

Hi
I am creating checkboxes dynamically. I want to catch the even when a checkbox is checked.

How can I do this. I know I need to create a method:

CheckBox1_CheckedChanged(object sender, System.EventArgs e)

But how do I attach this method to all the checkboxes I create dynamically. I cannot use OnCheckedChanged="CheckBox1_CheckedChanged"> as I am adding the checkbox dynamically.

thanks

Re: Add Checkbox Event handler dynamically

Mike Ellison28-Apr-06 5:52

QUERY: Mixing ASP.NET 1.1 & 2.0 pages in same website

28-Apr-06 5:52

The general format for programmatically assigning an event handler to a control in C# is:
ControlName.Event += new Delegate_Type(Name_Of_Procedure)

So given the CheckedChanged event of a checkbox requires an event handler of the delegate type System.EventHandler, you can use the following:

CheckBox1.CheckedChanged += new System.EventHandler(CheckBox1_CheckedChanged);

dhruba.bandopadhyay28-Apr-06 5:32

dhruba.bandopadhyay

28-Apr-06 5:32

I know that it's possible to mix ASP & ASP.NET 1.1 in the same
website/application so long as they are in separate frames (iframes). This
also holds for mixing ASP & ASP.NET 2.0 pages. But what I haven't tried
is mixing ASP.NET 1.1 & ASP.NET 2.0 pages in the same website/application
but each page in different iframes.

I don't think it's possible to to have both ASP.NET 1.1 & 2.0 pages in
the same website since IIS defines which ASP.NET version to use. Does
anyone know a way to make IIS use ASP.NET 1.1 for certain pages, and
ASP.NET 2.0 for other pages?

Probably one can host the ASP.NET 1.1 website, and link in the iframes
of ASP.NET 2.0 pages from another website in the same IIS server. But
that's just looks clumsy.

Re: QUERY: Mixing ASP.NET 1.1 & 2.0 pages in same website

minhpc_bk30-Apr-06 0:44

minhpc_bk

30-Apr-06 0:44

Hi there,
You can configure some web pages in your ASP.NET 1.1 application to run under the .NET 2.0. You can follow the steps as below:
+ Move the web pages which you want to run with the ASP.NET 2.0 into a subfolder, say A.
+ In the IIS snap-in, right click A to open the Properties window.
+ In the Directory tab, click Create in the Application Settings section.
+ Switch to the ASP.NET tab, you now can see that the ASP.NET version dropdownlist is editable, and you can select the version 2.0 for the A, and click Apply.
+ You then can go back to the Directory tab, to click the Remove button, this step is optional as you also simply leave it as it is.
+ You finally click OK to close the Properties window and do your testing.

However, you should remember that the ASP.NET 2.0 supports 100% backward compatibility, so you can simply configure your application to run with the ASP.NET 2.0 and your old web pages still work properly.

I can get an event to fire for a link button inside a GridView

Ista28-Apr-06 4:50

Re: I can get an event to fire for a link button inside a GridView

28-Apr-06 4:50

I have a GridView defined as

                   <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" Width="100%" BorderStyle="None" GridLines="None" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" OnRowCommand="GridView1_RowCommand" DataKeyNames="ID"><br />
>

and my template field is defined as

<asp:TemplateField HeaderText="Message Subject" ShowHeader="true" >
<ItemTemplate>
<asp:LinkButton ID="LinkTo" runat="server" CommandName="Select" CommandArgument='<%#Eval("ID") %>' Text='<%#Eval("Subject") %>' PostBackUrl="~/ViewPost.aspx"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>

and my RowCommand is defined as in code

<br />
    public void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)<br />
    {<br />
        if (e.CommandName == "GetEntries")<br />
        {<br />
            int i = 0;<br />
        }<br />
    }<br />

The problem is that the RowCommand never gets hit. The RowCreated does, but not the row command.

Anyone know why its not being hit?

Nick

1 line of code equals many bugs. So don't write any!!

Mike Ellison28-Apr-06 5:25

Re: I can get an event to fire for a link button inside a GridView

28-Apr-06 5:25

Hi Nick. I noticed that your comparison is for a commandName of "GetEntries", but your LinkButton includes a commandName of "Select". Is it that simple?

Ista28-Apr-06 5:27

Re: I can get an event to fire for a link button inside a GridView

28-Apr-06 5:27

yeah. I put a breakpoint on the if statement so I'm just trying to get there.

But, yeah it would be wrong.

thanks,
Nick

1 line of code equals many bugs. So don't write any!!

Ista28-Apr-06 5:52

Redirect to Word document???

28-Apr-06 5:52

For anyone who cares or does a search to find this:

If you have the SelectedIndex changed wired. Which is kinda default to you double click. Delete it.

Then the grid will hit the RowCommand

It hints this in MSDN, but not fully.

Nick

1 line of code equals many bugs. So don't write any!!

JimFeng28-Apr-06 4:05

JimFeng

28-Apr-06 4:05

I need to use response.redirect to a Word document that open with Word (Not IE prowser). When I type the "\\sitename\wwwroot\appfolder\file.doc" in IE address box, the document will be opened with Word. But when I use Response.Redirect("\\sitename\wwwroot\appfolder\file.doc") in my code the address in IE browser becomes to "href="http://siteurl/sitename/wwwroot/appfolder/file.doc" and get "the page can not be fount" error. How can fix the problem?

Re: Redirect to Word document???

Mike Ellison28-Apr-06 5:32

Re: Redirect to Word document???

28-Apr-06 5:32

If the file.doc is in the same folder as your .aspx page, would it work to simply use the relative path Response.Redirect("file.doc")?

JimFeng28-Apr-06 5:35

JimFeng

28-Apr-06 5:35

Response.Redirect("file.doc") will open the document in IE browser. I need to open the document in Word.

Re: Redirect to Word document???

Mike Ellison28-Apr-06 8:00