ASP.NET

13-Apr-07 0:30

Hi,

I'm trying to build a web control for an application i'm building but i've run into some issues.

Yesterday i suffered an error relating to view state and it seemed that my dynamic control addition was breking things. I've set the control i'm building to disable view state and that problem is solved.

Now it seems that i can't get events back from buttons within the control. These buttons are added at runtime and i've registered as i would for winform or console apps. The function that i've pointed to never gets called.

I assume this is something to do with turning off viewstate. Is it possible to find the name or ID of the button that submitted the form? Is there a better way of using events in this scenario?

Thanks

Russell

thomasa13-Apr-07 0:49

thomasa

13-Apr-07 0:49

have you added the click event? something like:

<br />
Button btn = new Button();<br />
btn.Click += new System.EventHandler(this.btnEdit_Click);<br />

You could also add the attribut "CommandArgument" or "CommandName" and add an ID number to that button.
Something like:

<br />
btn.CommandArgument = iUserID.ToString();<br />
or<br />
btn.CommandName= iUserID.ToString();<br />

And then:

<br />
private void lbtnEdit_Click(object sender, System.EventArgs e)<br />
		{<br />
			System.Web.UI.WebControls.Button btn = (System.Web.UI.WebControls.Button)sender;<br />
<br />
			int iUserID = int.Parse(btn.CommandArgument);					<br />
			<br />
		}<br />

Hope it helps
Thomas

enjoycrack13-Apr-07 0:51

13-Apr-07 0:51

hi Russell:

can you post your snippet of code here? I also add controls dynamically and add event handler for those...it's working... Confused | :confused:

Russell Jones13-Apr-07 0:58

13-Apr-07 0:58

the code's a bit wrapped up with data code etc at the moment. A lot of the code has come from a very object oriented winform / service app so it's been hacked about a bit.

private TableCell GetButtonCell(string name, string cssClass,string Text)<br />
{<br />
   Button newButton = new Button();<br />
   newButton.Click+=new EventHandler(Button_Click);<br />
   newButton.ID = name;<br />
   newButton.CssClass = cssClass;<br />
   newButton.Text = Text;<br />
   TableCell newCell = new TableCell();<br />
   newCell.Controls.Add(newButton);<br />
   return newCell;<br />
}

That's the code for adding a new button.

For the moment i've found that only the button that submits the form has its name in the request.form collection so i'm checking in there and calling the Button_Click method from there.

Do you add controls after every post back?

Russell

enjoycrack13-Apr-07 1:01

13-Apr-07 1:01

yeah..you have to add controls after every postback...try that

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Russell Jones13-Apr-07 2:03

13-Apr-07 2:03

i've been adding the controls after every postback but i assumed that there was a problem with adding extras after each postback. I checked the names of the controls and the order they were being added to the controls collection and i couldn't see anything wrong with it.

Russell

enjoycrack13-Apr-07 3:55

13-Apr-07 3:55

Russell Jones wrote:
but i assumed that there was a problem with adding extras after each postback

Nope, actually web is stateless environment...AFAIK Big Grin | :-D

Are you still facing the problem? the event is not get fired?

<< >>

Russell Jones13-Apr-07 4:06

13-Apr-07 4:06

sorry when i said extras i meant things that are not in the viewstate.

I'm getting all sorts of problems now. The event started working for the first submit of the page but none after that. I've given up on events now, i've got a way of identifying the button, so i'll leave the events till later (I'll come back to it when i've doubled my 3 days ASP.Net experience)

My big problem now is that the controls on the page are displaying incorrect data. It seems that even though i am setting their states in code they are carrying over the values that they previously contained.

http://www.codeproject.com/aspnet/ViewState.asp
this shows a model of how this might occur.

The data in my DB are fine and if i totally reload the page rather than posting back the data on screen look fine.

Russ

Editing In Grid

Lijo Rajan13-Apr-07 0:20

13-Apr-07 0:20

How we can validate the data in the text box which we are getting in gridview by using edit event of grid?

Re: Editing In Grid

_AK_13-Apr-07 1:11

_AK_

13-Apr-07 1:11

You can write use validation controls and also you can write your own javascript code to validate the inputs. What you need to do is to write the javascript and attach it to the save button of that gridview.

Best Regards,
Apurva Kaushal

Re: Editing In Grid

Lijo Rajan17-Apr-07 0:45

17-Apr-07 0:45

Thanks Mr Apurva Kaushal.Your reply was verymuch helpful for me.I realy except such a nice reply from u further

Re: Editing In Grid

_AK_17-Apr-07 2:52

_AK_

17-Apr-07 2:52

Always welcome.. Smile | :)

Best Regards,
Apurva Kaushal

Binding Grid

Lijo Rajan13-Apr-07 0:16

13-Apr-07 0:16

How we can bind the Grid on one page from another page?

Re: Binding Grid

_mubashir13-Apr-07 0:19

_mubashir

13-Apr-07 0:19

plz give some more details

Mubashir
Software Architect
Storan Technologies Inc, USA
Every job is a self portrait of the person who did it.

Re: Binding Grid

Lijo Rajan17-Apr-07 0:58

17-Apr-07 0:58

Thank you verymuch Mr Mubashir for your positive approach to my question.Let me clearly explain you my problem.I have one gridview and upload button on my aspx page.When i click on that upload button i am calling one popup window by using java script.On that window i have the control for uploading file.When i click attach button on that popup window my file gets uploaded and i am inserting the number of file uploaded in one table from which i am binding grid on my aspx page.I need to display the number of file uploaded in that grid when user clicks attach button on popup window.That means the binding of grid and uploading of file should be happened when user clicks on that attach button since both are in two page

Re: Binding Grid

enjoycrack13-Apr-07 0:54

13-Apr-07 0:54

I'm not sure I got your clue...but in another page...you srore the datatable in session ...then in the page you want to bind to the grid (just get from session...)

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