ASP.NET

retrieving data through session id's?

19-Jun-09 23:50

ankurdsharma wrote:
.shud i create a new page abt product everytime.

No, that would be a mess. Create a single product page, which is passed an id and populates itself with a specific product from the DB, based on that id.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

shankbond19-Jun-09 19:17

shankbond

19-Jun-09 19:17

Hi,

I am creating a webapplication with three forms in asp.net/C# ,also I am using Sqlserver-2005.

In my application:

1)form(1) I am using a link button,and other textboxes plus buttons ; on its click the application will simply open a new form(form2); also I should tell you that I have alreday filled some textboxes in form (1) before clicking link button.

2)there are two text boxes in this form(2) and a button.

3)when the user clicks this button, all the text box data will be transferred to the form(1),and will be stored in textboxes there, also tthe user should also see the previous informations entered.

now the problem:

whenever I will run the application it will simply show an error message that form should have values coming from session id?

well, I tryed to solve it by simply copying form(1) as form(3)

form(1) wont have any data coming from form(2) and would simply send all its data to form(2), form(2) along with its data and form(1) data will be transferred to form(3)

any better technique of doing that

or

anyother suggestions or remedies?

thanks and regards

Christian Graus19-Jun-09 19:48

19-Jun-09 19:48

If you want to tell us what error you had, post the actual message. Pasting it into google is even quicker.

I'd make the forms controls on a single form, so viewstate can store the values for you, and you write code to move it between controls.

shankbond20-Jun-09 1:55

shankbond

20-Jun-09 1:55

HI Christian ,
consider the scenario below:

page(1)

session("empid")=txtempid.text;

textbox3=session("values").Tostring();

page(2)

txtempid.text= session("empid").Tostring();

session("value")=textbox3.text;

now simply consider this application to be running from page 1

Christian Graus20-Jun-09 12:44

20-Jun-09 12:44

Well, textbox3 will start with null, and if you go back and refresh, it will contain the text in the OTHER textbox3, given that you have two controls with the same names on two different pages. What is the issue ?

Dynamic Control Postback Issue

shankbond20-Jun-09 22:50

shankbond

20-Jun-09 22:50

ok thanks for the answer, I didn't think about making it "null" oops!

shankbond

Tyrone Watt19-Jun-09 9:04

Tyrone Watt

19-Jun-09 9:04

Hi
Im having a nightmare with a postback sequence so hopefully someone can give me ideas on how to solve this.
Hopefully I will be able to explain my issue correctly.

I have a Repeater on a page which contains a User Control in its Item Template
The User Control has (among other things) a place holder control.
Another user control is loaded dynamically with LoadControl (based on a database id) and added to the placeholder.
So basically I end up with

Repeater
   - UserControl (PageComponentController)
       -- DynamicUserControl
   - UserControl (PageComponentController)
       -- DynamicUserControl
etc

Repeater_ItemDataBound Snippet

CMS.Controls.PageComponentController pagecomponentcontroller = (CMS.Controls.PageComponentController)e.Item.FindControl("PageComponentController");
if (pagecomponentcontroller != null)
{
    pagecomponentcontroller.PageComponent = pagecomponent;
    pagecomponentcontroller.EditMode = _editmode;
    pagecomponentcontroller.Zone = _zone;
    pagecomponentcontroller.VirtualPage = _virtualpage;
}

PageComponentController onLoad Snippet

_component = (CMS.Components.BaseComponent)LoadControl(_pagecomponent.Component.UserControlPath);
if (_component != null)
{
    _component.PageComponent = _pagecomponent;
    _component.EditMode = _editmode;
    _component.VirtualPage = _virtualpage;
    _component.Zone = _zone;
    phComponent.Controls.Add((UserControl)_component);
}

The UserControl (PageComponentController) contains two buttons "Edit" and "View"
Which then sets a property inside DynamicUserControl
This property is saved to the ViewState of the DynamicUserControl

public DAL.ComponentViews View
        {
            get 
            { 
                Object o = ViewState["COMPONENTVIEW"];
                return (o == null) ? DAL.ComponentViews.View : (DAL.ComponentViews)o;
            }
            set 
            {
                ViewState["COMPONENTVIEW"] = value; 
            }
        }

First problem is this viewstate is not remembered (always null) on postback so the control always displays its default state rather than the selected view. All the controls are populated again and show, but not the correct state. Is there anyway to save the state of dynamically loaded controls?

Also, is it possible to tell which dynamic user control fired the postback?

With a postback all the page_loads fire for all the controls on the page.
The events wire up correctly (for the most part Frown | :(

) but i need to know in the page_load of the dynamic control not just if a postback occurred by if the postback was fired by that particular control.
Is there a way to do this?

Thanks

Christian Graus19-Jun-09 11:14

19-Jun-09 11:14

Tyrone Watt wrote:
Is there anyway to save the state of dynamically loaded controls?

Sadly, your controls need to be created BEFORE page load, in order to participate in the reconstruction of the viewstate tree. Otherwise, the values are dropped. The alternative, is to store a hidden field in your page, and have javascript store the state of controls in that, because then you'll have something to set the state with, when you recreate the controls.

Tyrone Watt wrote:
Also, is it possible to tell which dynamic user control fired the postback?

Same issue, really. No click event, unless the control existed before page load.

Tyrone Watt20-Jun-09 2:10

Tyrone Watt

20-Jun-09 2:10

Hi
Thanks for that.
I have no problem creating the controls in PageInit instead but either way that doesnt seem to be the case.

The click event fires correctly after the page load, and the viewstate is set correctly in the "onclick" event, but it is not set in the page_load. So somewhere between the page_load and the onclick the viewstate is set back. Problem is I need to do things based on that viewstate before the click event or regardless of whether a click event occurred at all.

With the second question, maybe i didnt phrase it correctly. What I need to know is which particular control fired the postback in the page_load. So if i have 6 user controls on a page and control 3 fired the postback. On the page_load for the page and all 6 controls is there a way to tell that it was control 3 that did the postback, or is a javascript hack with a hidden field the only way.

As the event fires in the correct control, surely the must be some means of knowing which control fired the postback rather than just knowing that a postback occurred from one of the 6 controls.

Thanks

Christian Graus20-Jun-09 12:46

20-Jun-09 12:46

1 - if you create the exact same control tree, viewstate should be restored

2 - yes, I got that. If you have viewstate, then the sender property of the event is passed the control that fired it, so you can access it that way. In the absence of viewstate, you don't get an event at all. As soon as an event fires, cast the sender to the right type and then identify it from there.