.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
david stephan
Gaurav Pal
Post New Web Links

Deleting a key container. Detecting if it exists.

Posted By:      Posted Date: August 28, 2010    Points: 0   Category :.NET Framework
I have a need to detect if a key container exists. I have looked at http://msdn.microsoft.com/en-us/library/system.security.permissions.keycontainerpermission(VS.80).aspxbut I have two problems. One, the 'Deny' method appears to be obsolete. When I copy the code from this demo I get a warning that Deny is obsolete and will be removed. Two, if I follow the instructions to delete the key from the container it seems to work but if I subsequently try to get the key from the container I get another key and there is no indication that any key had been removed. Any ideas on thus manipulating key containers? Thank you. Kevin

View Complete Post

More Related Resource Links

check if file exists inside foreach container?


Hi All,

I have a foreach container that checks a folder C:\FTP for an Excel file named Fast_<date>.xls, imports the data, and copies the file to C:\Archive.

I need to add a step that checks C:\Archive for a file with the same name as the file in C:\FTP before the import step.  If the file is already present in C:\Archive, the package should fail.  If it isn't, then it should continue normally.

I found a promising-looking link in a previous post, but the referenced page no longer exists (below).   I have never used a script task, and I will have a different file name each time, so I am a little confused. 

If someone's feeling benevolent, suggestions would be very much appreciated!!

Thanks in advance!

broken link: http://agilebi.com/cs/blogs/jwelch/archive/2007/10/31/checking-for-the-existence-of-a-file.aspx


Linq to Sql CompiledQuery container

Ok now let's go. Here is just a little trick but with some interesting patterns that could be useful in some other contexts not connected to Linq to Sql.

When using Linq expressions, like with Linq to Sql, translating the expression into something else (sql for example) is taking time and resources. Sometimes it's negligible, sometimes not...

Adding Client-Side Confirmation When Deleting

The JavaScript confirm(string) function displays its string input parameter as the text inside a modal dialog box that comes equipped with two buttons - OK and Cancel (see Figure 1). The confirm(string) function returns a Boolean value depending on what button is clicked (true, if the user clicks OK, and false if they click Cancel).

Tab container rendered with visibility:hidden - This was reported over three years ago.



Here is (more) code that demonstrates the issue.  If the control in the host page is removed the tab control renders correctly.  Otherwise it is rendered with the visibility attrubute set to hidden as reported in the above link.  Is this broken or am I doing something wrong?



<%@ Page Language="C#" AutoEventWireup="true" CodeFile="S2.aspx.cs" Inherits="S2" %>
<%@ Register Src="~/SelectorPatternControl.ascx" TagName="TestControl" TagPrefix="sam" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <form id="form1" runat="server">
        <cc1:ToolkitScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true"></cc1:ToolkitScriptManager>

Re-positioning an HTML container with javascript onresize with a Master page.


I have an HTML <div> container that I float to the right of a gridview.  When the browser window is maximized, it looks fine.  When minimized, the gridview positions below the floating container and most of the data is pushed off the bottom of the browser - you have to scroll down to see it.

If I position the floating container above the gridview it looks fine in a minimized window, but looks real bad when maximized.

What I want to do is use a javascript: onresize event to re-position the floating container up or down depending on the window.inner.width AND do it with a Master/Content page structure AND do it for only the one page where needed.

I can capture the onresize event and display the window dimensions but haven't figured-out how to do it with a Content page that still uses the Master page.  I think I'm having a very "thick" week...

- Tinker


Detecting Edit or Insert Page


I am coding a .cs file that handles the metadata for a particular table. I am putting a custom validation that allows me to update or insert only if the PubMedID is not already in the database. This would be easy except that the PMID should also be allowed to be null as some of the references in the database were not from PubMed. So i perform a query on the database to see if there is already an identical PMID in the database. This works great when using Insert. However, when using Edit, it does not. The PMID is already in the database because the one currently being edited has the same PMID!!! So I know exactly how to change my query etc. However, I do not know how to tell from inside this Edit/Insert agnostic page, which one it is being called from. Thanks for your help! 

Detecting PPC device on startup page to redirect?

I was wondering (since a search didn't find any posts) if there is a way for my startup page to detect what kind of device (PocketPC or web browser specifically) is loading the page and if it is a PocketPC, then redirect to the mobile pages? I will only be using PocketPC's exclusively as a mobile device.

Thanks for any suggestions!

Resource Leaks: Detecting, Locating, and Repairing Your Leaky GDI Code


Leaks are possible, even in robust Windows-based applications. As bugs go, leaks are some of the most difficult to find, especially when they occur in graphics device interface (GDI) objects and menus. While free and third-party tools exist to detect such leaks, it is usually difficult to make the connection between the numeric handle value returned by the tool, and a bitmap or menu in your program. This can limit the usefulness of these tools. Custom tools can be built that detect, track down, and eradicate GDI and menu leaks. Here, three such tools are built using well-known and documented APIs.

Christophe Nasarre

MSDN Magazine March 2001

table inside tab container goes under the tab



my tab control going crazy

i have this code

and the intable button is under the tab and not inside. why? 


<asp1:TabContainer ID="Tabs"

Checking if a URL Exists


I've got a HttpHandler which outputs XML to the client to play video, it outputs the url to the video, video name etc... Validates the request etc.

However sometimes when i upload new video the main URL doesn't pickup the file from the CDN so i have to use a different URL to go directly to one of the main servers.

For example the CDN url is:
One of the server urls is:

What i want to do is check to see if the file can be reached off the .net url before posting it back to the user.


if http://videos.****.net/ar/ar_1003_scene_1.ext response then
> post http://videos.****.net/ar/ar_1003_scene_1.ext to client
> post http://videos1.****.com/ar/ar_1003_scene_1.ext to client

I hope that makes sense.

I thought of doing a WebRequest/WebResponse but i don't want the file to come back, i just wanna know if its there or not. My site is on a single server while all the video is on a CDN.

(i can't post the url because it's NSFW)

Edit: Why do posts not auto format?!?

Linq to sql does not return appropriate multiple result sets with "If exists" conditions in the stor


Hello All,

I have a stored proc that returns 4 resultsets, they are in the format.

ALTER PROCEDURE [dbo].[pGetManagerEmployeeSummaryDummy]

    @ManagerStaffID int,
    @PeriodID int



IF EXISTS (select 1 from dbo.temployee e
    inner join dbo.temployeedetail ed
        on e.staffindividualid = ed.staffindividualid
        and ed.periodid = @PeriodID  
    inner join Incentive.tRole r
        on rm.IncentiveRoleID = r.RoleID
    where ed.ManagerIndividualStaffID = @ManagerStaffID
    AND r.RoleID = 1) --Closer
        SELECT e.StaffIndividualID, e.LastName, e.FirstName, r.RoleName, e.xname, e.yname

from dbo.temployee e

inner join dbo.temployeedetail ed
            on e.staffindividualid = ed.staffindividualid
            and ed.periodid = @PeriodID

where ed.ManagerIndividualStaffID = @ManagerStaffID

Deleting items from the index (custom protocol handler)

I created a custom protocol handler. I successfully emit entries into the index. I just can't seem to delete them during an incremental crawl.

I tried:

1. no emitting child item during the enumeration of child entries in a folder
2. returning PRTH_E_OBJ_NOT_FOUND from CreateAccessorEx

doing either 1, 2, or both did nothing. The entries are still there.

what i need to do to delete these entries from the index during an incremental crawl?


infopath form stuck with installing or deleting



I am deploying an infopath form in central admin and it stuck with the message "installing" and if i try to remove it stuck with message 'deleting". I restarted timer as well admin jobs in all servers (front end and app) but it is still showing the same. I also renamed my form and tried..no result. Can any one suggest me how to resolve this? I am wondering how it s happening just from one week.there are no changes in servers as well in environment. It works well before.



export rsa key container


1) I want to create a rsa key in c# and export the container. I am having difficulty. I create container like this:

CspParameters cspParams = new CspParameters();            cspParams.KeyContainerName = "XML_ENC_RSA_KEY";CspParameters cspParams = new CspParameters();
cspParams.KeyContainerName = "XML_ENC_RSA_KEY";

The msdn example says I can export the container with this syntax:
aspnet_regiis -pa "XML_ENC_RSA_KEY" "NT AUTHORITY\NETWORK SERVICE". This does not work on my XP Host PC. I belive this is applicable for Windows 2003 Server.
So what is the correct syntax for exporting rsa key container from XP host?

2) To get aspnet_regiis.exe path I did something like this:

string winPath = Environment.GetEnvironmentVariable("windir");       
string fullPath = winPath + @"\Microsoft.NET\Framework\v2.0.50727" + @"\aspnet_regiis.exe";

But this path may be different for each host, based on the .NET verison installation.
Is there a way to get the aspnet_regiis.exe path from registry or a environment varaible?

3) Once I get the path to aspnet_regiis.exe I want to invokve it from c# like this.
Is this code correct?

ProcessStartInfo startIn
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend