ADO.NET :: EF - Record Locking?
Mar 8, 2011
I'm about to begin a new web project using asp.net 4.0 (EF 2.0). I have a question on row locking...customer is concerned that if employee 1 has a record in edit mode, they want to lock the row and make it uneditable for other users, until employee 1 has saved their changes. A step further is, if employee #2 attempts to edit the locked record, a notification would appear, notifying employee #2 that "Employee #1 John Doe" has the record locked and to contact them.
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Oct 8, 2010
Does record locking (Pessimistic and Optimistic Locking) is applicable in ASP.NET application? If so, What is the pros and cons on doing this?
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Sep 3, 2010
In a multiuser asp.net web application that performs CRUD functions, how is a record in a listview control "greyed" out while someone else is making changes or would you consider I need a custom asp.net control,
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Nov 5, 2010
I use the app_offline.htm file to bring my site down when I have to roll a new revision. However, even after I launch I'd like to be able to play around and test my site before anyone else has access. Since almost all of my pages are available without logging in, I need to way to lock down my application to everyone but myself and obviously the app_offline.htm file won't for for this.
I have a BasePage class and I'm thinking the only way to do this would be to put code in that class's Page_Init method and I could check for my specific IP address and kick everyone whose IP doesn't match to the app_offline.htm file. However, I'm wondering if this would be the best method since my IP will change.
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Dec 10, 2010
I'm using a 3rd party web service in my ASP.NET application. Calls to the 3rd party web service have to be synchronized, but ASP.NET is obviously multi-threaded and multiple page requests could be made that result in simultaneous calls to the 3rd party web service. Calls to the web service are encapsulated in a custom object. My thought is to store the object in an application variable and use the C# lock keyword to force synchronized use of it.
I'm nervous, because I'm new to multi threaded concepts and I've read that you shouldn't lock a public object (which my application variable effectively is). I've also read that if the locked block of code fails (which it could if the web service fails), then it could destabilize the app domain and bring down the application.I should mention that the 3rd party web service is rarely used in my website and it's going to be rare that 2 requests to it are made at the same time.Here's a rough code sample of how I'd make calls to the web service:
ThirdPartWebService objWebService = Application["ThirdPartWebService"] As ThirdPartWebService;
lock (objWebService)
{
objWebService.CallThatNeedsToBeSynchronized();
}
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Sep 14, 2010
i have create a form..and i generate ID using dropdown list for user for registration before they save the page..the ID will appear when click "signUp" button.("ID" not saved yet into database)
i want the "ID" lock into databse when click "signUp" button..
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Nov 11, 2010
I have an ASP.NET MVC website that uses an internal dll for some PInvoke stuff. The dll is located in the /bin folder next to the other assemblies. This works well, but if I want to replace the content of the /bin folder with the newest set of files by copying onto the existing files (this is on a test server) the PInvoke dll is locked/used by the w3wp.exe worker process and cannot be replaced except after you recycle the apppool or restart IIS.
Is this standard behavior or can I somehow instruct the ASP.NET runtime to take a shadow copy of the PInvoke dll similar to the regular assemblies?
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Jan 12, 2010
I have multiple database running in my SQL Sever , in that I need to lock only one database is there is any inbuilt method in SQL Server 2008
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Feb 27, 2010
I'm working on locking down some MySQL user accounts. At the moment I typically grant my user accounts execute privileges over the required stored procedures within a schema.Now I'm looking at the proc table in the mysql schema. The common wisdom that's quoted many times on various websites says "Stored procedures require the presence of the proc table in the mysql schema".By granting select access over the proc table stored procedures will work. But if I removed the above select privilege and grant the user execute privilege over the entire mysql schema the procedure will also work.
Does anyone have any ideas about the security issues by choosing one of the above over another?I would prefer to lock the proc table down all together so the user cannot see it cannot select from it.
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Mar 6, 2010
Our client's web app restarts suddenly at random intervals. For each restart, we've found an entry like this in the Windows Event Log:
Event Type: Warning
Event Source: W3SVC-WP
Event Category: None
Event ID: 2262
Date: 2/21/2010
Time: 1:33:52 PM
[code]...
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Jul 6, 2010
I have a website which requires users to enter their corporate network username and password. It then looks for that account in Active Directory and gets a list of any email addresses associated with that account.
The problem I am having is that ONE incorrect password is locking out an account. Our domain policy is that an account will lock out after three incorrect entries, so I am assuming that I am doing something wrong in my code. I am not very knowledgeable about Active Directory or .NET DirectoryServices in general, which may be apparent from my code. Here it is:
public ArrayList AuthenticateActiveDirectory(string Domain, string UserName, string Password)
{
// An error occurs if the username/password combo does not exist.
// That is how we know it is not a valid entry.
try
[Code].....
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Jun 9, 2015
I have an ASPNET Application (C#) that runs on my company intranet. This application allows the users to attach PDF files against records.
I am trying to get that PDF uploaded in such a way that whenever the user initially uploads (the uploaded PDF will always be unlocked PDF), the user name would be stamped on the PDF file and the files is locked by my application so that the user cannot change the PDF again, even when having a PDF Writer. Whenever required the application should allow the user to unlock the PDF and then allow the user to edit the PDF.
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Oct 2, 2010
i have a web application who uses a stored proc in our SQL Database and process the data with SqlTransaction.BeginTransaction. but we don't place any isolation level.
The stored proc have multiple processing like insert, update and large queries from multiple tables. we decided to place the SqlTransaction class in our code to access the commit and rollback method incase the stored proc has an error.
later when the user is using our website, they experience locking, by the way the average number of users are around 600 a day.
is it possible to eliminate the chance of locking when using the SqlTransaction class when we use an isolation level like "Snapshot".
if not, what level should we use.
[Code]....
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Aug 13, 2010
VS2010 keeps locking my .aspx files so I can't edit them. I have to stop the project, close and reopen the file. Is there a setting causing this (it doesn't happen on my home machine)?
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Dec 29, 2010
I am building an aspx page using c# and Visual Studio 2008. can anyone help to answer this question,Q1. When a page has add/edi/delete features by calling stored procedure or sql inline code (within the aspx page) It may cause issues in this senario:two users accessing the same page, lets say they both at the same time are editing the same record. a third user is only viewing that same record. how can I control such senario who get to make the change first.Q2. if the thrid user accessed the record after the first user change the records, but before the second user change the record. is he going to see the origional record or the updated record done by the second user.Q3. if the third user opened the record to view it before the first user make any changes, so he is opening a grid view , lets say the first user make a change. The third user will still see the old record...right, so he is not viewing updated record.how would he know that the record he is viewing is not current?If anyone can explain the senario and also would appreciate if you have any documentation or URL reference to searh .
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Feb 28, 2011
I have a static collection of objects that will be frequently updated from multiple threads.Is it possible to lock individual objects in a collection instead of locking the entire collection so that only threads trying to access the same object in the collection would get blocked instead of every thread?If there is a better way to update objects in a collection from multiple threads, I'm all ears.
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Jun 8, 2010
I am modifying a rather large ETL package using BIDS. It builds a datawarehouse, so there are many sources and a single destination. There are quite a few data flow tasks, and their connection strings are read into variables from an encrypted source. All the data flow tasks are arranged serially because of variable locking issues - occasionally two DFTs attempt to simultaneously lock the variable and it fails. I realize there are script solutions out there, but I am looking for perhaps a more elegant (easier) solution than to apply scripted solutions to tons of packages over something so trivial.
I came across the "RetainSameConnection" connection property, and I have a hunch this could be the solution. My reasoning is: If there's only one connection to a data source, there should only be one read operation from the variable. At least, it makes sense when SOURCING.As for destinations, I'm not sure if it's a good idea to have data from multiple sources flowing in through a single connection.This is my first week working in ETL so I don't know all the nuances of databases, ETLs, connections, etc.
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Feb 12, 2010
I need to have maybe 5 threads running which all use the same DataSet and need to loop through all the rows retrieved but each row must be processed by one thread only (e.g. I don't want row 1 to be processed by thread 1 and thread 3).
I can also use a DataReader if that helps, but I need to dow some locking logic I would have thought.
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Mar 12, 2010
In the development environment, in SSMSE > MyDatabase > Security > MyUser > Database role membership I have checked db_owner to allow me to build the database.
Now I am copying the database to the production environment I would like to lock the security down tightly. In the past (with classic ASP applications) I have only checked db_datawriter and db_datareader and, in Securables, checked Execute Grant on the stored procedures.
In Database > Securables I add my stored procedures and check Execute/Grant for each of them and click OK. When I return to the securables page the stored procedures are no longer listed.
I have noticed that nothing is listed in Effective Permissions and I think it should list Execute. If this is the problem, how do I add Execute to the Effective Permissions list?
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Apr 30, 2010
I want to make a User login Form, in which account get lock if number of attempts gets exceed by three.
How can i implement the locking and unlocking strategy in login page?
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Aug 15, 2012
I created a user manually using Membership.CreateUser(). User created successfully but as soon user create Logged In User's tasks display. I want to use DisableCreatedUser() some how. or is any method to disable it?
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May 27, 2010
Is it possible to read the GUID from the Assembly without actually loading it in the current App Domain. Normally Assembly.Load loads the DLL into the app domain. I just want to read the value. The description of the GUID is
'The following GUID is for the ID of the typelib
' if this project is exposed to COM
<Assembly: Guid("DEDDE61CD-928E-4ACD-8C25-3B8577284819")>
The main thing is I don't want to lock the file so that there are no errors 'Another process is accessing the file' error.
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Oct 22, 2010
I have a nested gridview on my page, I have to apply sorting on that grid and wants the header to be locked. Means when I scroll the grid the header should be visible all the time.I have mousehover and onclick event applied on this grid. Whenevr I try to apply some code to fix the header, it results in detaching of header and moves up the screen on every scroll.
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Nov 16, 2010
I am using paging to my gridview (pagesize=4) . now i am in (X) page and i want to get (X+1) page top record or (X-1)page bottom record , how i can get .
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Mar 21, 2011
I have a delete button bellow my gridview and I want a pop up to show when no record is selected and tell the user to first select a record. The button click event would show the pop up, but my gridview data blanks out.
Here is my code:
[Code]....
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