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Cached Data Reference Pattern in ASP.Net

Posted By: shellymn     Posted Date: May 22, 2011    Points: 0   Category :ASP.Net
The article Cached Data Reference Pattern in ASP.Net was added by shellymn on Friday, May 06, 2011.

Whenever an attempt is made to access data from the cache, it should be with the assumption that the data might not be there any more. Thus, the following pattern should be universally applied to your access of cached data. In this case, we're going

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Unable to locate System.Data.Extension.dll library in Add Reference.



I want to use LINQ over DataSet in my C# ConsoleApplication project.But i do not find System.Data.Extension.dll in Add Reference section of my project.There is System.Data.DataSetExtension.dll present. I added that file, but then which namespace to use in my project ?

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I have a datagridview control that I'm using to display cache data to the end used on a web form. The issue that I'm having is that every time I re-run the application, and the cache data is re-generated... it loads duplicate data that's being displayed to the end user. I can't seem to figure out how to keep this from happening.

What I would like to have happen is that only unique data rows be returned and cached for the end user. Unless there are new data rows on the database that needs to be included in the cache data results...the previous data results should not be duplicated. I've tried to change a few properties on the datagridview control, but nothing seem to keep this from happening. I have included a copy of my code below. Any help would be greatly appreciated.


' Code that is used to cache data that's returned from database

Protected Sub PopulateNewhardwareSetInfo()

   Dim conn As SqlConnection = New SqlConnection(m_connectionString)

   Dim cmd As SqlCommand = New SqlCommand("Select * from HardwareSet", conn)  

   Dim sqlDA As SqlDataAdapter = New SqlDataAdapter(cmd)      

   sqlDA.FillSchema(m_ItrackerData, SchemaType.Source, "HardwareSet")

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Here is data binding expression (dropdown list is nested in gridview)

<asp:DropDownList ID="ddlEmployees" 
         DataSource='<%# PayCheckBO.GetEmployeesNameIdPair() %>' 
         SelectedIndex='<%# GetSelectedIndex(HOW TO PASS REF of ddlemployee HERE)%>'/>

Code Behind has function which looks like

public int GetSelectedIndex(DropDownList ddl)
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The whole reason for passing the reference is to save round trip to database and not to use SESSION

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Msg 547, Level 16, State 0, Line 1
The DELETE statement conflicted with the REFERENCE constraint "FK_TR_BookingDetail_TR_BookingHeader". The conflict occurred in database "Master", table "dbo.TR_BookingDetail".
The statement has been terminated.

i'll try to delete data from tr_bookingDetail first, but it's still show that error.

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