I need to know how many ways I can lock a file? Suppose a process has opened a file and reading or writing it, by this time another process try to open it and read or write, how many ways I can impose lock level on that particual file? So, that the data remain consistant.I'm using VS 2005 and OS is Windows XP or Windows 2003 Server.
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I have a big excel file , and i want to upload it to server.
on upload_click , i have to do a processing which takes very long time,
because i am finding latitude and longitude from the google by reading that excel file.
and i wanted that when used click on CANCEL button the process should stop.
i have created a thread on upload_click and doing all this stuff in that thread .
when user clicks on CANCEL , i am aborting that thread.
but when user again tries to upload file , i am getting the error that file is in use .
to solve this problem i have to stop aspnet_wp.exe from task manager and have to try again .
I have a file uploader I would like to be able to have a folder added to the folder path on upload based on a textbox.text "MapPath("~/Uploads/" + Path.GetFileName(e.filename))"
I have Dim folder as String = textbox.text how do I add folder to MapPath("~/Uploads/"
it currently checks for .xml files how can I add more .doc .gif etc
Dim savePath As String = MapPath("~/Uploads/" + Path.GetFileName(e.filename)) 'Validation for file extension If Path.GetExtension(e.filename).Contains(".xml") Then Return End If
I retrieve movie path value from db . movies are flv file types. Is there any free control that I could assign it's moviepath value nad it stram flv movie while provide me with some thing like youtube.
I googled for it but most of the control like JW FLV Flash Video Player Control won't work.Does any one know any free flv player
How can i filter the file in the dialog box
View 3 Replies I have an application that allows admins to add types such as document types and training types that are in seperate tables with a foreign key in a transaction table.
When structuring my class I decided to go with an abstract-like pattern (without the factory methods though). So I have a Type abstract class that defines my Save, Delete, and GetList methods. I have a training type class that inherits this class. The thing is all types have 3 main properties - defined in the abstract base - but have different source tables and thus different store procedures in my DbCommand object. So basically I repeat setting up the same parameters on all the derived classes. I would like to implement the common stuff in the base but I am getting thrown off by the difference in data sources.
how can we check file types (formats such as jpg) without using file extensions before -uploading them- in asp.net with c# ?
i am using vs 2008 + asp.net + c# + TELERIK Controls (RadUpload)
imagine that some body change the text file extension to jpg and select it in a upload conrol such as radupload ...
how can we recognize that this file is truely jpg or not?
I using coolite in my project. And upload files through the FileUploadField control. I have to add a filter for the file type, so that the user could see only jpeg and bmp files from the choose file dialog. Havent found how this can be implemented in the web.
View 1 RepliesI have added validation to validate if the user has chosen .doc file or not. But I want to show only .doc files by changing the "files of type to .doc" in file upload window.
View 1 Repliesdoes someone know elegant way to hidde/prevent direct access to some filetypes or web site resources, but that this resources remain accessible from application.
For example that mp3's in Music folder on www.somesite.info cannot be accessed directly via url like [URL] With routing off course.
I want to limit the allowed uploaded file types to images, pdfs, and docs. What is the recommended way to approach this?
I assume checking the file extension alone is not enough, since an attacked can change the file extension as he wishes.
This is basically for a course management system for students to upload assignments and teachers to download and view them.
i Dont know how many types of asp.net websites.
ie. asp.net webiste types of categories.
Give me the deatiled Information.
I want to limit the allowed uploaded file types to images, pdfs, and docs. What is the recommended way to approach this?I assume checking the file extension alone is not enough, since an attacked can change the file extension as he wishes.I also thought about checking against MIME Type using PostedFile.ContentType.I still don't know if this is adding any further functionality than checking against file extensions alone, and if an attacker have and ability to change this information easily.This is basically for a course management system for students to upload assignments and teachers to download and view them.
View 2 RepliesExporting the GridView to various file types. I have got the PDF working great and also want to add Excel. When I use the code I get a message that the file I am trying to open is a different file format from the extension I am trying to open. If i click OK it opens and alls is fine. Trying to get rid of this errors so customers and sales staff doesn't see it. Excel is version 2010.
View 1 Repliesi want is to copy huge data from many tables to a master table in my database.
the copying process should executed once at the time from asp.net.
so if a user "A" start copying process, user "B" will not have the permission to copy untill the old process (started from user "A") complete.
what i am thinking to do is if its possible to lock "Copying Function" from using more than once at the time.
I have page with several textboxes, dropdowns, and check boxes on it. When I click my update button and the update happens, at that point all of the textboxes on the page are locked, I cannot click into any of them. The dropdowns and check boxes still work.
I do have an update panel on the page:
[Code]....
Coding Platform: ASP.NET 4.0 Webforms with C#
I have two roles admin and member. In my application, admin can manipulate most of the member data. I know that in forms authentication a user can be unlocked like,
MembershipUser user = Membership.GetUser(clickeduserName);
user.UnlockUser();
Membership.UpdateUser(user);
My questions are,
How to lock a user in forms authentication? Why is MembershipUser.IsLockedOut Property set as ReadOnly? Is it not the right way to LockOut people as an administrator?
I have a FormViewwith several bound textboxes whose values (text) are generated in code. The textboxes are bound to the data with Bind("<FieldName>"). Because there values are generated in code, I'd rather not let my users change their values. I have tried making them read only. However the values of the text boxes did not update when the form was updated. I tried disabling the textboxes but that grayed them out. I tried replacing the textBoxes with labels while keeping Bind("<FieldName>") but that didn't update either.
(1) Am I doing this right? (2) Is there any way to lock the value of a text box without graying the textbox?
Does anyone know why the lock that is to show when on an https site would show, but then vanish once the page is done loading?
View 2 RepliesI am using IE8 browser. I would like to Lock column header of gridview in IE 8 Normal View. I can lock in In compatibility View . I could not Lock In Normal view of IE8 Browser. I have developed Asp.net Application(c#) usingNote: Gridview column Header is dynamically loaded as per Client Requirement.
View 1 RepliesI have 3 different work centers assigened to 3Text fileds on my webform DesignDate,CollectDate,TMSDate ).the process of job is likely to be DesignDate->CoolectDate->TMSDate.when i complete the Design process i will go for Coolect filed and put a date(which indicates particulr job due date)when i am moving from Current work center to nextwork center previous work center should be locked .is it possible to to do locking the textbox if already date exists in that field else allow to enter for text.My text fields are txtDD,txtCD,txtTMS.
View 3 RepliesA few months ago I was interviewing for a job inside the company I am currently in, I dont have a strong web development background, but one of the questions he posed to me was how could you improve this block of code.I dont remember the code block perfectly but to sum it up it was a web hit counter, and he used lock on the hitcounter.
lock(HitCounter)
{
// Bla...
}
However after some discussion he said, lock is good but never use it in web applications!What is the basis behind his statement? Why shouldnt I use lock in web applications?
Is their a wayin sql server 2005 to change some type of setting on a data table so that it can not be updated or inserted into?
My problem is that I have a data table that is somehow being populated by an application. I have looked through all of the stored procs, views, functions and the C# code itself. I can't find out where or how it is populating a certain data table. So I figure if I can somehow make the table non updateable, then I can find out where the insert/update is occuring.
This would all occur in a test environment of course.
I'm developing an ASP.NET forms webapplication using C#. I have a method which creates a new Order for a customer. It looks similar to this;
private string CreateOrder(string userName) {
// Fetch current order
Order order = FetchOrder(userName);[code]....
The problem here is, it is possible that 1 customer in two requests (threads) could cause this method to be called twice while another thread is also inside this method. This can cause two orders to be created.
How can I properly lock this method, so it can only be executed by one thread at a time per customer?
I tried;
Mutex mutex = null;
private string CreateOrder(string userName) {
if (mutex == null) { [code]....
This works, but on some occasions it hangs on WaitOne and I don't know why. Is there an error, or should I use another method to lock?
What I'm looking to do is lock the application so the admin can do maintenance for however long. All i want to do is be able to click a button on a "maintenance" page and it makes it so anyone who attempts to use the system and anyone who is already in the system is redirected to a page, if they try to do anything, that says the site is down for maintenance.
on postback, on redirect, etc. No Access until that button is clicked again to unlock.
