At present i am able to persist that using session InProc mode. except that i cant use either stateserver or sql server as the HTTPPostedFile is not serilizable. i can't use viewstate either for the same reason. Is there any work around to persist that httppostedfile across postbacks for session modes other than inProc or viewstate?
View 4 RepliesAlright, so here's my basic ASP.NET page setup: I've got a page with a GridView that has ContentTemplates in it. You can add a row and edit/remove rows at any time. There's a "New" button that creates a new row.
All of this data is bound to custom data objects. So if I have a GridView of "People" and each row has "FirstName", "LastName", and "Gender" (with TextBox and DropDown controls), I then have a "Person" object which has public properties for "FirstName", "LastName", etc. I have the binding set up correctly, and I can push data into the GridView from the object, and I persist the object with the Session variable. My page lifetime structure looks something like this:
Page_Load: Loads the List(Of Person) from Session()
Any events fire, and modify the List(Of Person).After any event, the List(Of Person) gets saved back into Session(), and is then DataBound to the GridView (and any subsequent fields are also DataBound, such as the DropDownList.
My question is: Whenever I fill in rows in the GridView, and then add a new row (there is no database saving going on whatsoever), my fields clear out and don't persist across PostBacks. So, how can I persist my custom data objects with databinding across postbacks?
I've a checkbox with autopostback=true. If i check the checkbox the postback occurs and changes a label text. But if i click back in the browser the checkbox is not returning to its previous unchecked state. How can i bring back its state?
Can i write some JavaScript to persist the state of a control?
how can DropDownList attributes be persisted accross page Postbacks?
Example:
DropdownList1.AutoPostBack = True
DropdownList1.items(0).Attributes.Add("Attribute1","somevalue")
On Postback the attribute is no longer available (ie. attributes.count=0).
I tried persisting using the code below, but was unsuccessful:
Before PostBack: ViewState.Add("DDL","DropdownList1")
On PostBack: DropdownList1 = ViewState("DDL")
This generated the error: DropDownlist is not marked as serializable.
I than tried:
Before PostBack: Session.Add("DDL","DropdownList1")
On PostBack: DropdownList1 = Session("DDL")
This did not err but attributes were still not available.
I want to upload an XML file and after that i've to load it by using XMLDocument and do some changes, then save XML file back to same location where actually l uploaded. But whenever i'm loading XML file and written code for finding path is like..
string path=Path.GetFullPath(FileUpload1.FileName);
but it return path like.. "C:\Users\nagaraju\VegaFIXSettings.xml"
but actually i'm uploading XML file from D:\VegaFIXSettings.xml
how to get actual path when uploading file by using FileUploadControl.
in my asp.net i need to convert httppostedfile to bmp or image format.how to convert this.am getting posted file from fileupload control.
Session["File"] = FileUpload1.PostedFile;
I have a standard FileUpload control, which calls a class library, where the file becomes HttpPostedFile. In beta versions of my page, I've been able to successfully use HttpContext.Current.Server.MapPath(filename)to save the file. The class library does various functions, including saving the image into /uploads and a thumbnail into/thumbs.
But now, after tidying up the layout of the site, the upload aspx page has moved to a subdirectory 'members'. I had assumed (wrongly) that calling the upload function would act as normal. However, now I receive an error because of where the page is originating from: The code wants to save the file in the non-existant folder /members/uploads and /members/thumbs
My question is: Apart from hard-coding the directory structure of my hosting provider, is there any way to use an equivilent to server.mappath which will recognise the root path of the website, and ignore sub-folders?
One method which solves my problem is to append "../" to the start of the file location, eg HttpContext.Current.Server.MapPath("../" & filename) ...However, as many pages will be able to call the upload class library (and not all of them in a sub-folder) I want to make sure I'm not always back-tracking on the subfolders.
I was wondering whether HttpPostedFile.SaveAs function in ASP.NET C# is a blocking call.
View 1 RepliesI have this method which does not build, it errors with the message:
Cannot implicitly convert type 'System.Web.HttpPostedFile' to 'System.Web.HttpPostedFileBase'
I really need this to be of type HttpPostedFileBase instead of HttpPostedFile, I have tried boxing and it does not work:
foreach (string inputTagName in HttpContext.Current.Request.Files)
{
HttpPostedFileBase filebase =HttpContext.Current.Request.Files[inputTagName];
if (filebase.ContentLength > 0)
{
if (filebase.ContentType.Contains("image/"))
{
SaveNonAutoExtractedThumbnails(doc, filebase);
}
}
}
how i persist the selected date of calendar control on Postback iam displaying Dates from database in to Calendar control and when page postback then nothing is heppening . How i persist the selected dates on Postback may i have to use Session or some thing like that?
View 5 RepliesI need some high-level advice on how to deal with this issue. I want to have dynamically created buttons, each with a different CommandArgument, that call an OnCommand event when clicked. Given that these are dynamic buttons, I have to re-create them in Page_Load after the postback. However, when I re-create the buttons, the orginal command arguments are lost, and the arguments generated after the postback are only valid.As you'd expect, if I don't recreate the buttons, the event handler is never called because the buttons don't exist.My question is, how can I retrieve those original commandarguments, without the use of sessions.
View 6 RepliesI've created a visual webpart .My user control is gridview,in which one of the column is checkbox.The checked state of my checkbox within a gridview get disappeared during postbacks. I want to maintain the checked state.
View 1 RepliesI have a requirement as mentioned below: 1. There is a gridview containing a linkbutton field (lnkgdvMerchant)in one of the column defination as menioned in the mark up below :Please note the bolded line of code for more details.
[Code]....
I want to create a gridview with checkboxes. (only vb.net)
1) persist checkbox rows in paging in vb.net not c#
2) add the checked rows to datatable datasource and show on next page in paging
I am using IIS Url rewrite to convert urls from /mypage.aspx?q=value to /page/value.html.
Everything works fine during the first call to the page but on postbacks the url is transformed into
/page/value.html?q=value
when using asp controls such as GridViews, Pagers or Custom Controls.
As a result the Server returns a 404 Error and i can see the corrupted url on the browser's address bar.
This problem was observed when i wanted to change the page of a gridview using a pager.
I would like to save some data for use after a page postback. Here is an example of what I'd like to do:
Partial Class TestPage
Inherits System.Web.UI.Page
Private _CategoryID As String = ""
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
_CategoryID = "ABC"
Me.ViewState("CategoryID") = _CategoryID
Else
_CategoryID = CType(Me.ViewState("CategoryID"), String)
End If
End Sub
End Class
I've tried both session variables and view state. The page loads fine initially, but on postback I get the following error:
Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
What am I doing wrong? How can I save this data for use after postback?
I am having a problem with postbacks on my live server.I have added a button to my page with postbackurl="google.com when I press the button it is doing nothing but If I put response.redirect("google..
in the code behind button click event it will work?Is there an simply reason that the postbackurl is not doing anything?
I have a page, where I dynamically add textboxes within an updatepanel with a button.click event. Those are common telephone, fax, email, etc.. Now I put in some values, store those in Session with Arraylist and go to next page. Here, there is a button to go back to previous page. Ive managed to recreate all those textboxes on Page_Load event, using if not page.ispostback, then.. Now, this problem is driving me crazy. When I load my page, put in some values, add as many textboxes, as I want and go "Next", its ok. Then I go "Back" and everything is recreated and I see as many values within textboxes, that I created. But when I do this for a 2nd time, I can only see recreated textboxes without values. Ive spent some time searching for a simple solution, or an advice. But with no success. I could post some code here, but its a bit long and complicated. But if necesarry, I will.
View 4 RepliesI have just gotten a very odd error and I can't explain, or trace it out. My forum entity maintains a list of child forums. The list is internal, and exposed as an ienumerable, along with some methods like AddChild, FindChild and RemoveChild. Now to the code:
[Code]....
I have stepped through this several times, testing values along the way. It works perfectly, so I cannot explain the error. If a parent forum id is given, forumRepository.Update(parent) runs with no errors, it just doesn't actually save the new child to the db.
Incidentally... until I restart VS2010, the nhibernate session actually THINKS it HAS worked, and the new record shows on the page.
I'm building a web application that has a particular model representing some events. Users need to be able to add N number of people to a given event. Choosing people is handled by a partial view.
I'm trying to build a menu that displays when users click "add a person" to the event. Because the event hasn't been filled out completely yet, there is nothing in the database to persist between requests.
I also have validation logic on the event page.
My proposed solution is to add the form to search or add for people on the event form itself and have a submit button that sends the values that have been added back to the server, where I can store them in ViewData or Session.
Unfortunately, doing this flags the validation.
My second solution is to load a partial view responsible for loading the UI to add/search for a person. I could add a little code on the method in the controller that returns a partial view storing the existing data in a session variable or viewdata. Trouble is, I have to submit the form to do it--again tripping the validation!!!
I'm wondering if perhaps I chose the wrong tool to do this...because in webforms, there would probably be a postback and you would just perform an operation on that postback. I'd like to avoid rewriting the application in webforms and am wondering if there are ways I'm overlooking in ASP.NET MVC.
I have a datagrid that loads on page_load.
In this instance I can't load the datagrid in page_init as the results of the datagrid are determined by a checkbox and the checkbox would always be set to true during page_init to the viewstate not being loaded.
I have an OnItemDataBound event on the datagrid that dynamically creates controls and later on I want to access the value of some of these controls (e.g. a text box)
Of course the problem is I can't access these controls values as they don't persist over a postback.
I am new to ASP.NET MVC and I am using ASP.NET MVC 2. I am trying to implement the following feature and I need your expertise on this:
Authentication is Windows Authentication. Every user has at least one country associated to his/her account that he needs to manage.When a user navigates to the site we have to look up his/her associated country and persist it somehow (session?).With every call to the backend we need to pass the country as a filter. When a user has more than one country associated to his/her account, we need to display a dropdownlist on the site and the user should be able to change the "current" country at any time.
I have a couple of questions:
Where exactly in the lifecycle in the ASP.NET MVC framework should I retrieve the country or countries for the currently logged on user and where should this be persisted? In ASP.NET I would solve this by creating an intercepting filter using a HttpModule to set the Countries in the session state. What is a good way to implement this in ASP.NET MVC 2? (strongly typed session state wrapper?, magic strings?)Should I put a dropdownlist for the selection of the countries in my masterpage? How can I make sure that the current country remains selected in this dropdown?How can I make sure that with every call to the backend the country is passed, should I use an action filter?
I've got a master page with a section for subnavigation links on it:
<div id="sub_nav" runat="server"></div>
I programatically populate this with Hyperlinks when my main asp:Menu data is bound depending on the address of the page I'm on.
This works fine and all my correct submenu stuff shows up on each page. The problem is that when one of these pages does a postback, I lose all the links that were in my sub_nav div.
Now, I could just populate the div with links every time regardless of whether the master page load is a postback or not, but I figured there is a better way of doing this. I was thinking enabling the viewstate on the div and links inside it might persist them through postbacks, but apparently that is not how viewstate works.
I am retrieving results from a SQL database based on a user file upload, and I am saving the returned results in a datatable. It can be up to 15,000 rows. I need to use this datatable in other requests in this same page - i.e. saving the data back to another table, exporting to a file....How can I store the datatable to access again? I read up on viewstate, session , and cache, but they all seem to have an affect on performance and memory.
View 7 Repliesi am currently working on a webform that has several dynamically populated dropdown lists. this works just fine, however, i have other web controls that require to have a postback..and at the time the page postsback, it reloads my dropdownlists, reseting whatever option i had chosen...
what can i do to resolve this?