Forms Data Controls :: Caching DataTable - Create/cache Multiple DataTables?
Jul 23, 2010
Among the many aspects of asp.net that I haven't focused my development on yet is caching. I have a perfect application for it now, I think, with a GridView that sits inside a repeater, and is bound in the Repeater ItemDataBound event. The contents of the GridView will remain static for each Repeater data item for each Client. The nature of the data in the GridView is that it can change from day to day per Client, but wouldn't need to be refreshed more frequently than that. The Page istelf only deals with one at a time Client based on a QueryStringParameter. My questions are a) how do I cache the DataTable so that a call to the DataBase isn't made each time Repeater item is bound and b) can I create/cache multiple DataTables (one for each Client) and let them live for day, checking for existence before calling the SQL stored procedure to regenerate the data?
My DataTable method: [Code]....
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Feb 26, 2010
I've got a web application that runs of a state server. It looks like soon it may need to distributed and there will be two web servers behind a load balancer.
This works great for session state but my next challenge is Cache
My application leverages heavily of cache. I understand ASP.Net 4.0 will be offering more here but nothing much has been said about the how too.
There are two challenges that I face
1). Each webserver will have its own copy of cache whereas it would be more efficient to put this to a third server the same as session state is put to state server.
2). The real challenge is keeping cache in sync if a simple dataset derived from the database is changed my code dumps that cache item and reloads the cache. That's all well on one webserver but webserver number two wont know to drop that particular cache item and reload it. This could cause some unexpected problems in the application.
For scenario number 2 I could attempt to do some smart coding so server number two knows to dump the cache and reload it.
My guess is someone else has already been here before and there's probably a better implementation approach rather than writing extra code.
Does anyone know how I could achieve the goal of keeping Cache in sync between multiple webservers or even better farm Cache management to another server?
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Apr 1, 2011
I have 2 views in sql server and I create a dataset with those 2 views as datatables. Now I need to create a datatable and programmatically fill it with the other 2 datatables. Take the 2 datatable and create a third one in the dataset not create a third view in sql server.
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Sep 8, 2010
since asp.net contains multiple threads that are executing at the same time.so if 2 threads access an object (simple or complex) that i got from the the asp.net httpcontext Cache.can't this lead to state problems on that object if these 2 theads tried to modify/read it at the same time?so what kind of precautions should i implement?for example i am thinking maybe locking the object while working with it? (wont this cause performance problems?)or maybe when i retrieve some object from the cache i should create a copy from it?
or maybe i dont need to worry about this issue at all?
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Mar 29, 2010
Is it correct to implement my caching object like this in my controller :
[code]....
And I Use it like this :
[code]....
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Apr 2, 2010
Does dataset store all its datatables' records into server memory if I just call one datatable from it?Lets make an example, a dataset with three datatables - tbCompany, tbCompanyStaffs, tbSalesOrderwhere tbCompany is the parent of tbCompanyStaffs. tbSalesOrder is an independant table.Does dataset load all tbCompanyStaffs records into the server memory as well when a class retrive data from tbCompany?
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Apr 8, 2010
In our .aspx pages we have user controls each control has a Sql query to fetch data. The caching mechanism to be followed says that fragment cache all the user controls and invalidate the cache based on the respective queries of the user control.How to proceed to add a query dependency to fragment cached user control?
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Feb 22, 2013
I need to remove the data stored in the cache after few minutes (Output and Data Cache).
My concept is binding data from server, storing it in to cache and displayed in the gridview, after a 10 seconds when the button is clicked the cache data should removed and need to show null like nothing. I have build some basic of code, how to get perfectly. I am new to dotnet.
find the below required points and attachments of asp.dot net code and sql query.
1. When page load, gridview should display using Cache.
2. when Clear Cache Button after 10 second from pageload is clicked then the gridview should go hide
3. Reload Cache Button is clicked the gridview again load.
Default.aspx
Default.aspx.cs
usingSystem;
[Code]......
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Oct 27, 2010
I am trying to combine two datatables into single datatable... First table contains 3 columns[e.g: 'col1','col2','col3'] Second table contains 2 columns[e.g: 'col4','col5'] Both tables have the same no.of records[rows], but different columns. How to combine them into single table? I need DataTable with columns ['col1','col2','col3','col4','col5']. I am inserting through looping the both the tables and adding values into third table. I tried the Merge (DataTable.Merge()), but it is adding the records to bottom of first one, but i need it should be added to the side[as columns] to first table'
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Jul 26, 2010
I'm want to add multiple DataRow into a dataTable Based on the number of selected GridViewRow ?
[Code]....
[Code]....
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Feb 17, 2010
I am embarrassed to ask, but what is the best way to add key/value pair data in cache (HttpRuntime.Cache) to a DataTable?
I'm currently dumping the key/value pair data from cache into a HashTable, which becomes the DataSource for a Repeater object. Unfortunately, I cannot sort the data in the Hashtable and therefore thought a DataTable (being the DataSource for the Repeater) would solve my dilema.
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Jun 17, 2010
What I have is a datatable being constructed from Sharepoint API. We dont need to worry about the sharepoint api.The code where it fills the data is as follows
Datatable dt = new datatable();
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Apr 8, 2010
i have gridview resulted from sql query as below:
customer_id
items
123
pen
123
paper
456
pen
456
paper
678
pen
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customer_id
pen
paper
123
(empty)
(empty)
456
(empty)
(empty)
678
(empty)
(empty)
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Mar 27, 2010
I have a gridview which is binded by a datatable.
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Feb 22, 2011
[Code]....
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Nov 25, 2010
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Like the following example with 2 criteria:
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Criteria 2 Filtered Result: Stock B, Stock C, StockE, StockF
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Oct 1, 2010
[OutputCache (Duration=20, VaryByParam="None" )]
public ActionResult display()
{}
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If the above code is used, the user info on top also cached and give wrong info to user.
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Jan 23, 2010
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Apr 23, 2010
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Mar 28, 2011
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Jan 29, 2010
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I just find this freaky weird since I have another list of custom objects which are much more complicated (consisting of Inheritance, Interfaces, and also containing Properties which are generic lists of other complex objects) and the caching of those lists work without issue.
Both the working and non-working list are being managed in C# classes outside of the ASP.net user controls which consume the cached data. Both of these cache handling classes call the exact same Cache Manager class singleton instance which wraps the HttpRuntime.Cache to provide typed methods for pull and pushing objects into the cache.
Here is the class
[code]....
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Sep 8, 2010
We display an ASP.NET calendar control and update the color and if the day is enabled with the DayRender event. This process is a bit slow so I'm trying to map out a strategy to cache the results of the all the DayRenders. Basically take a snapshot of the calendar and cache it for X minutes. Where would I hook into the page/control workflow to accomplish this goal?
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Feb 23, 2010
How to create Rows and Column using Datatable Gridview Itemtemplate with multi header I need to create Datatable Gridview Itemtemplate fixed rows and column such as 7 rows and 7 columns
[Code]....
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Jun 16, 2015
I want to Get multiple selected column from datatable using c#. Below I have added data of datatable and I want red marked rows from datatable. Green marked text is column name of datatable.
Parameter Value
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tempFilename 0
data 0
fid 0
useid 0
filename 0
tempFilename 0
userName 1
pwd 1
LoginResult 1
useid 2
usename 2
address 2
mobileno 2
emailid 2
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city 2
country 2
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