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

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

Cache vs Static variable

Posted By:      Posted Date: September 23, 2010    Points: 0   Category :ASP.Net

Well, I know the big difference, but one thing is confusing me. Cache works only on a single machine on webfarm and to make it globally we use Velocity or memcache.

So is static does same, or is it already work globally ?


Cache["someid"] = "value"; //this will only work on single machine cache,

static string abc = "value"; // will this work on single machine or globally ? 

View Complete Post

More Related Resource Links

Cache vs Static Class

Hi All, I am sure this question has been posted many times, but have not got time to wade through. Apologies in advance! I am working on a new web application which has extremely high volumes of traffic, the application uses two large(ish) data tables (approx 15,000 rows/records each - both fairly 'wide' tables....) which are each the result of various JOINS and other intensive operations. The post query operations are unavoidable and the data structure has been optimised wherever possible. I am debating on using the Cache and CacheDependancy classes to store these tables, but fear the 'eviction' process due to the demand in traffic and server resources generally. I can certainly afford to build these tables once, on the first request (near Application Start), but should memory become scarce, do not want the cached data to be recreated during the application lifecycle and have concerns about how ASP.NET will manage demands on this data in such a crisis. For example, if during a period of time, available memory is at an all time low, I would anticipate that the CacheDependancy would keep recreating the tables for each request. (I don't know...) Note: The Cache API is not used elsewhere and the Application and Session scopes are hardly used. At present, I am using just a static class to store the two tables which works a

static time variable


Hi all,

I'm not really much of a programmer but I've been working on something in visual web developer and VB...

I've got an asp.net page with a fileupload control and two buttons. One button is used to upload the file and then the other button does something else which involves accessing the file name of the uploaded file.

This is straight forward enough if you just use static text but I wanted to create a unique file name for the upload so thought about using a date/time value for this and delcaring it as a variable?

This works great but how does the second button then access this file name? If I use the same variable name declared earlier it just generates a new one especially if mins and secs were used?

I'm not sure if that makes sense? But I'm basically wanting to create a unique file name for the uploaded file and then store that in a variable so it can be accessed by the other button? Without the variable constantly updating to a new ID?

Thanks for any help.

Accessing static variable in global.ashx file


Hi All ,

I want to access the static variable in my global.ashx file  I am using classname.variable name for accessing the variable but the variable name dose not appear.Can someone tell me how to access static varialbe in *.ashx file.

private static member variable is not instantiated until it is first referenced?


I expected that all static variables and initialization blocks are executed when class is accessed first time. But, when reading http://msdn.microsoft.com/en-us/library/ff650316.aspx, I found the following statement:

"Because the Singleton instance is referenced by a private static member variable, the instantiation does not occur until the class is first referenced by a call to the Instance property."

I searched MSDN website and got confused even more:

"The static field variable initializers of a class correspond to a sequence of assignments that are executed in the textual order in which they appear in the class declaration. If a static constructor (Section 10.11) exists in the class, execution of the static field initializers occurs immediately prior to executing that static constructor."


Can anyone please refer me to detailed description of initialization process.






Application variable or static class for global string?


I need to keep a global variable throughout the whole time the user is at my site, but do I use Application or a static class? The string variable should store a region name and my site makes a few changes depending on which region that has been set.

I read that Application was mainly for classic ASP, but I also read that a static class cannot be instantiated at runtime (e.g. when the user has logged in).

So, have I got something wrong here and which solution do I use?



does static Regex.Match(string input, string pattern, RegexOptions ops) cache ?


in msdn, it is said that static Regex.Match(string input, string pattern) caches for future uses,

but it doesn't say whether static Regex.Match(string input, string pattern, RegexOptions ops) caches.

Then does it cache? Does it help to promote performance at creation?


Static Class for Beginners

In general, the members of a class can be accessed by instance of that class when they are in public, but there comes a situation to access or call members of a class without an instance and this can be achieved by declaring them as static

Local variable scoping in C#

In my previous post, Compiler-generated scopes for local variable declarations, I briefly touched on the issue of multiple meanings applied to the same name. In this post, I'll aim to flush out the compiler's rules with regards to binding names in their local scopes.

Compiler-generated scopes for local variable declarations

I was tasked with understanding and fixing a bug on error reporting with foreach iteration variables the other day, and it got me thinking about local variable scoping rules in C# in general. First, the bug.

abstract away the source of the connection string using a class with a static property.

ASP.NET provides a configuration system we can use to keep our applications flexible at runtime. In this article we will examine some tips and best practices for using the configuration system for the best results.

The element of a web.config file is a place to store connection strings, server names, file paths, and other miscellaneous settings needed by an application to perform work. The items inside appSettings are items that need to be configurable depending upon the environment, for instance, any database connection strings will change as you move your application from a testing and staging server into production.

Let's abstract away the source of the connection string using a class with a static property.

Retrieving a variable from a previous page



I'm looking to have a search page where a user will select an item from a listview, then then taken to another page that wil display data based on their original selection.

A user will type in a string and be presented with a list of usernames that are like that string, when they select a user name who's profile they would like to view I would like the page that they're taken to, to be that users profile.

How would I transfer the variable from the search page to the profile page, and when I work on the profile page, how can I access that variable?


Embeb a variable number of videos


I need to provide some alternate content for my non-Flash users.

I have a directory of video files that is scanned using the DirectoryInfo() function, and I want to use the results to embed all files ending in ".mov" in QuickTime players on a web form.

How would you approach this? Right now I am using the count on the array of videos to determine how many times to repeat the embed code.  But this seems inelegant.

Is there a way to have a single QuickTime player.ascx control that gets duplicated according to the number of videos available for display?

How to take value of bound field of grid in a variable or in a textbox.


How to take value of bound field of grid in a variable or in a textbox.

 I m using this code in .aspx page for grid.

<asp:GridView ID="Grd_Mprocess" runat="server" AutoGenerateColumns="False"

                      Width="100%" AllowPaging="True"


                      AllowSorting="True" PageSize="5"  >

                 <RowStyle CssClass="odd" />


<asp:BoundField HeaderText="DOC_TYPE_PK" DataField="DOC_TYPE_PK"  Visible="true" >


  <asp:TemplateField HeaderText="DOC TYPE ID" Visible="true">  &nbs

Hidden variable has no value


I know I have a valid solution, but the js is telling me that the value in the hdnRecordSaved variable has no value!
Even when I specify in my function the following, it still tells me it has no value:
var myTextField = document.getElementById('hdnRecordSaved');

When I put the full value of the variable in (ctl00_ctl00_cphTopCenter_cphCenter_hdnRecordSaved.value), I get the correct contents back ("1"), which I set in my code behind. However, I would prefer to just put the short name in since the masterpages may change, etc. Unfortunately, I know I can get around this with VS2010, but we are using VS2008.

What am I doing wrong with the js naming conventions that can't give me the contents? Here is my below js.

<asp:Panel ID="pnlMapFields" runat="server" ScrollBars="Both" Height="430px">

<telerik:RadTreeView ID="RadTreeView1" runat="server" DataTextField="Description"

DataFieldParentID="MapFieldparentID" DataF

How to retrieve data from SqlDataSource and pass to a variable?


Hi there,

I have a page in my website where there is very little code-behind. I only have two lines of code in Page_Load() and the rest of the code is declarative ASP.NET code. I have a FormView control which uses a SqlDataSource to get some order information. The SqlDataSource calls a stored procedure called usp_GetOrderDetails, here's the code for the SqlDataSource:

    <asp:SqlDataSource ID="sdsFormOrderDetails" runat="server" 
ConnectionString="<%$ ConnectionStrings:ForexDB %>"
ProviderName="<%$ ConnectionStrings:ForexDB.ProviderName %>"
SelectCommand="usp_GetOrderDetails" SelectCommandType="StoredProcedure"
UpdateCommand="usp_UpdateOrder" UpdateCommandType="StoredProcedure"
<asp:ControlParameter Name="orderId" ControlID="grdOrders" PropertyName="SelectedDataKey.Value" />
<asp:ControlParameter Name="orderId" ControlID="frmOrderDetails" PropertyName="SelectedValue" />

NUnit and public static readonly


I have an app that I am testing with NUNit.  The project im testing has several helper classes that are created as public static readonly.  When I run the NUnit tests, they all fail with the same error

SetUp : System.TypeInitializationException : The type initializer for 'Systems.Utils.ConstantHelpers' threw an exception.
  ----> System.NullReferenceException : Object reference not set to an instance of an object.
SetUp : System.TypeInitializationException : The type initializer for 'Systems.Utils.ConstantHelpers' threw an exception.
  ----> System.NullReferenceException : Object reference not set to an instance of an object.

I kept getting this error despite stripping out all

AppFabric Cache: Real-World Usage and Integration


Windows Server AppFabric provides a distributed cache for both web and desktop applications. Well show you how to integrate AppFabric caching into your apps, along with some hints for taking advantage of new cache features in the .NET Framework 4.

Andrea Colaci

MSDN Magazine June 2010

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