Linq query efficiency?

I want to display some stats in a listview contril.  The table contains a record for every impression and for every click, and every record has a datetime field for the time and date of the impression of click.  I want to be able to display how many impressions and clicks there were in a given day and hour, something like below:

Date              Time                              Impressions    Clicks
8/20/2010                                               450              14            
                     Midnight -1:00am               150               5
&n

I am assigning and unique id [strShipperIdSequence] on my List on bases of some properties which are grouped together uniquely.
Now what i needed is that my group should be further break down to some maximum amount of chunks.[Let say 10]
that mean's even i am having Same value in 12 records i should get 2 groups[I of 10 items and other of 2 items]

var uniqueGroups = objMdbContentInfoList.GroupBy(p => new
        {
          p.CON_ENTRY_POINT,         
          p.APPTType,
          p.CON_CONTAINER_ISSUE_DATE
        }).Select(g => g.First()).ToList();
        foreach (var objUnique in uniqueGroups)
        {
          string strShipperIdSequence = APIGlobalMethods.GetShipperRequestID();
          foreach (MdbContentInfo obj in objMdbContentInfoList.FindAll(h => (h.CON_ENTRY_POINT == objUnique.CON_ENTRY_POINT &&
                   h.APPTType == objUnique.APPTType &&
                   h.CON_CONTAINER_ISSUE_DATE == objUnique.CON_CONTAINER_ISSUE_DATE)))
          {
            obj.Shipper

I have an array list called Customer. I t holds a list of array list which has the account details.

proj.customer -> collection of arraylist of type customer

proj.customer.account -> collection of arraylist of type account

Account array list holds type account and it has a poperty account balance. How can I query all accounts which has account balance  >100

I tried the following one

var Accountlist= from Account accountdetails in proj.customer.account

where accountid.balance >100

select accountdetails.id

But it is always throwing an error saying cannot cast type customer to type account

Please help

Jared Parsons demonstrates a technique to achieve maximum performance from LINQ queries on large sets of data in order to create a responsive user interface.

Jared Parsons

MSDN Magazine August 2008

LINQ to Objects and LINQ to Entities have an arsenal of Standard Query Operators that operate on sequences to perform a wide variety of operations.

John Papa

MSDN Magazine March 2008

Hello,

I am facing problems converting a relatively complex SQL query to a LinqToSQL statement. There are lots of examples on the web, but none involve 'joins' + 'where' + 'group'

Here is my query I am trying to use Linq for :

select Customers.CustomerID,          
       count(*) as NumOfOrders,         
       sum(Customers.BillingAmount) as BillingAmount,      
       sum(Orders.OrderTotal) as OrderTotal  
From Customers 
left outer join Orders on Customers.CustomerID = Orders.CustomerID
Where Customers.Name = @username	  
      and Customers.LastLoggedIn > @fromdate	  
      and Customers.LastLoggedIn < @throughdate	  
      and Customers.ZipCode = @zipcode 
group by Customers.CustomerID

I need help converting this to a LinqToSql for VB.Net

Thank you very much!

Is there option to convert from Linq.IQueryable to DataTable with some sort of CopyToDataTable() function. I am trying this.

     var row = from p in dc.ProductModels

                  se

Hello

I have a GridView in my page. I want to use below code in code beind. query nothwing DB using linq . add linq query result to new list and then bind list as gridview Datasource

I use below code . But I don't know how to add results to List? Could any one tell me how !

Public Class OrderCity
        Private _name As String
        Private _city As String
        Public Property name As String
            Get
                Return _name
            End Get
            Set(ByVal value As String)
                _name = value

            End Set
        End Property
        Public Property city As String
            Get
                Return _city
            End Get
            Set(ByVal value As String)
                _city = value

            End Set
        End Property
    End Class
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        Dim dbe As New SFFAV1DataContext
        Dim latestadsDs = From p In dbe.Products _
                            Select New With {p.Title, p.ProducedCity} _
                             Take (2)

        Dim FilteredList As New List(Of OrderCity)()
        For Each result In latestadsDs
            Dim Menedfcou = Nothing
            FilteredList.Insert(0, Menedfcou)
        Next
     
         GridView1.Da

I am using a LINQ query with multiple joins, the last join does not return any values even though values exist in the database. Below is my code.

when the query returns suiteNameTrg and SuiteTypeTrg are empty, all other values are returned correctly.

string suiteNameTrg = string.Empty;
            string suiteTypeTrg = string.Empty;
            using (DataClassesDataContext db = new DataClassesDataContext())
            {  
                    var productQuery = from assets in db.ASSETs
                    join relocatableUnits in db.RELOCATABLE_UNITs on assets.RUID equals relocatableUnits.RUID into assets_units
                    from relocatableUnits in assets_units.DefaultIfEmpty()
                   join build in db.BUILDINGs on assets.BUILDING_ID equals build.BUILDING_ID into assets_bins
                   from build in assets_bins.DefaultIfEmpty()
                   join test in db.TEST_SUITEs on assets.TEST_SUITE_ID equals test.TEST_SUITE_ID into test_bins
                   from test in test_bins.DefaultIfEmpty()
                    
                    join testTrgt in db.TEST_SUITEs on assets.TARGET_TEST_SUITE_ID equals testTrgt.TEST_SUITE_ID into testTrgt_bins
                    from testTrgt in testTrgt_bins.DefaultIfEmpty()

                    select new
                                   {