Fill A Checkedlistbox With Linq To Sql Query?

May 17, 2012

Here's my query[code]...

how to get it from the array to the checkedlistbox.

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LINQ Query Is Enumerated - Turn On Some Kind Of Flag That Alerts Me Each Time A LINQ Query Is Enumerated?

Sep 22, 2009

I know that LINQ queries are deferred and only executed when the query is enumerated, but I'm having trouble figuring out exactly when that happens.Certainly in a For Each loop, the query would be enumerated.What's the rule of thumb to follow? I don't want to accidentally enumerate over my query twice if it's a huge result.

For example, does System.Linq.Enumerable.First enumerate over the whole query? I ask for performance reasons. I want to pass a LINQ result set to an ASP.NET MVC view, and I also want to pass the First element separately. Enumerating over the results twice would be painful.It would be great to turn on some kind of flag that alerts me each time a LINQ query is enumerated. That way I could catch scenarios when I accidentally enumerate twice.

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Let My Query Being Controlled By A Checkedlistbox?

May 20, 2012

I have a Query which looks like this (in Query builder VS11)[code]...

so if a user selects the option 'programmeren' in chkbRequirementsm (= the name of a checkedlistbox) in the query it should start looking for all the programmeren with value True.

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Showing Query Result In CheckedListBox?

Feb 15, 2012

I'm trying to show some concatenated data in a CheckedListBox so that users are able to select the data for use later on. Here is the code I am using currently:

Dim con As New MySqlConnection
Dim theQuery As New MySqlCommand
Dim theTables As New DataTable

[Code].....

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.net - ActiveRecord Linq/NHibernate Linq Not Building Query Completely?

Jul 14, 2011

given this function:

Public Function Search(ByVal StartIndex As Integer, _
ByVal MaxResults As Integer, _
ByVal AccountNumber As String, _
ByVal LastName As String, _

[Code]....

instead of what I expected:

Select count(*) from remitline where lastname = "smith"

What am I doing wrong building up the where clause? I'm using Castle ActiveRecord 2.1

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Performance Gain In LINQ Query Vs LINQ Stored Procedure?

Aug 6, 2009

if there is that much of a performance gain in running a LINQ stored procedure versus a LINQ query?

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Asp.net - Complex Linq Query - Add A .Where() Or .Any() Predicate To Reduce Query Complexity (in VB)?

Sep 14, 2010

I have to join two main tables, and I need to filter the results by elements in an ASP.NET web form. These filters are created on the fly so I have to use a lot of where extensions to filter the query. I want to execute the query with as optimized SQL as possible.

I am first doing a simple join between TW_Sites and TW_Investigators. Then there are two sub-tables that are involved. TW_InvestigatorToArea and TW_InvestigatorToDisease. While most of the where clauses are working fine, I have found a performance issue that won't be an issue right now, but will be an issue as the table gets bigger.

The arrays DiseaseCategories and DiseaseAreas would be the results of a CheckBoxList result.

Protected Sub LoadResults()
'Get Dictionary of Filters
Dim FilterDictionary As OrderedDictionary = Session.Item("InvestigatorFilterDictionary")
' Initialize LinqToSql

[code]....

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LINQ Query Using The Dynamic LINQ Library?

Mar 31, 2011

Forgive my ignorance on this.I have this LINQ Query:Dim ngBikersDataContext As New CarBikeWalkDataContext

bikersList = (From c In ngBikersDataContext.Reg_Bikers _
Order By c.L_Name _
Select New Bikers() With { _
.BikerID = c.BikerID, _
.F_Name = c.F_Name, _

[Code]...

with the error "Overload resolution failed because no accesible 'Select' accepts this number of arguments."
Over the "NEW" I get an error " ')'expected."

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"System.ArgumentException: An Item With The Same Key Has Already Been Added." When Trying To Order An In-memory LINQ Query By A LINQ Association?

Jan 27, 2011

We are doing a query against an in-memory collection of LINQ data objects. The wrinkle is that we are ordering by a column in a related table whose records have not necessarily been loaded yet (deferred loading:)

Dim oPkgProducts = _
From b In oBillPkg.BillProducts _
Where b.Successful.GetValueOrDefault(Common.X_INDETERMINATE) = _

[code]....

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LINQ To SQL - Add In Row_Number To A LINQ To SQL Query?

Aug 31, 2011

How do I add ROW_NUMBER to a LINQ query or Entity? How can I convert this solution to VB.NET?

[Code]...

I'm having trouble porting that last line. I have been unable to locate a VB.NET example. I'm actually not looking for any paging functionality like the example provides, just good old-fashioned Row_Number(Order By X) row index.

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VS 2008 Linq Possible To Use Query In Another Query?

Apr 16, 2011

I was wandering is it possible to use a query within another query below is the code I am trying to use.

Public Function GetInventByComp(ByVal CompID As String) Using DC As New DataClassDataContext
'need to get company id's based off names? thats bad should be name from Id need to rethink this
Dim invent = (From C In DC.Inventors_Companies _
Where C.CompID = CompID _
Select C.InventorID).ToString

[Code]...

I was trying to us multiple values in a string like "1, 3, 5" but I can't seem to get that working either so I am trying to use just a single value now. Can anyone help me? "Yes I am new to this"

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Call A Stored Procedure In SQL Using LINQ To Fill A Combobox

May 14, 2012

I have a combobox named cbEmpState, I need to call a stored procedure named 'spStateList' and have it fill the combobox. I'm having a hard time finding examples of this online. The stored procedure is in my dbml file.

Here's the stored procedure


ALTER PROC spStateList
AS
SELECT * FROM states ORDER BY StateName ASC

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Fill Combobox With Database Query?

Apr 28, 2010

I am having a problem with filling a combobox with unique values.Im not very good at vb either so I will explain what I have done so far.

1. I added a combobox to my form called Combobox1

2. I clicked the little triangle widget thing on the ComboBox1 set the dataset to MyDATASETDataSet1

3. Display Member: CurrencyCountry, Value Member: FCode, Selected Value = None

4. I fill MyDATASETDataSet1 when the form loads using:

PricesTableAdapter.ComboBoxQuery(CurrencY_DATABASEDataSet1.Prices)
ComboBoxQuery =
SELECT DISTINCT [CurrencyCountry], [FCode] FROM [Prices]

The form does not load, i get the error: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.If I replace ComboQuery with Fill Query (which is the default fill command) it displays results....but not unique results, i see the same items being repeated throughout the list in the combobox.I guess my questions are:

1. when you fill a dataset do you need to select all the fields when you are creating your query?

2. if i simply wanted to perform the following lookup:

SELECT DISTINCT [CurrencyCountry], [FCode] FROM [Prices]and set the combobox Display Member: CurrencyCountry, Value Member: FCode how would I do this in the code?

3. how can i change my query to display only unique values, distinct doesnt seem to be working?

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Fill ComboBox With Query Result?

Dec 11, 2011

I'm trying to fill combobox with my SQL query result.[code]...

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How To Fill Datagrid With A Custom Query

Jan 24, 2009

[code] i use this line to fill the datagrid Me.tableTableAdapter.Fill(Me.DDataSet.table)how can i fill the datagrid with a custom query?

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How To Fill Datagrid With Results Of Query

Apr 26, 2010

I've got a button that sends an sql query to the database it works but i don't know how to fill the datagrid with the results of that query

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Use Linq To Read Excel Worksheet And Fill ComboBoxes Controls?

Jul 22, 2010

1- Read an Excel Worksheet into DataTable (dt);2- Check 'dt' to know if some columns titles exists;3- Query 'dt' and discard rows where some itens are null or empty;4- After query 'dt', fill some ComboBox.I wrote the code below. It works nice, but I don't know if I'm using best practices when I use Linq to query the data table like I did.

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Fill Datagridview Column With Sql Query And Data?

May 6, 2011

i want to fill my datagridview column with sql query and data i have 1 datagridview in datagridview 4 column

column1 column2 column 3 column4
this gridview is undound
i want to fill with sql data

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Use Backgroundworker For Generate Query And Fill Datagirdview?

Dec 12, 2011

my query is too long and retrive larg data.

and myform hanged when query is process.

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Using TextBox To Fill A DataViewGrid In Query Builder?

Apr 22, 2011

I am trying to use a DataViewGrid to show certain transactions.I also have a TextBox for the user to enter the transaction ID to fill the DataViewGrid.In the Query Builder it works if I give the NABTransID in the Query but I want it to read the TextBox1.text to find the transactions.

[code]...

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Sending The Value Of Payor To The Fill Query Once The User Selects?

Sep 7, 2009

I have a field called "payor" where the user selectes either "All, Medicare, Managed care" from a drop down list. I am sending the value of payor to the Fill query once the user selects the one they want.

I have no problem with coding 'Where (payor = @payor) if the user doesn't pick ALL, but what code do I need to include ALL records if the user selects "ALL" in the where statement?

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Specify A Custom Select Query For A Datatable Fill Method?

Dec 17, 2009

VB.Net 2005 SQL server 2005

I have a project I have a dataset that contains tables In the dataset designer, each table has a defaiult FILL command set. I have draged and droped my table as a grid onto my form VB automatically sets up the table adapter, and binding source to make it all work.

in my code, is placed in the form load routine, a tableadapter.fill(dataset.datatable)

Here is my dilemma. The data in my table may have 100's of thousands or rows.

I have presented the user with a front end that allows for filterring and selecting based on several columns. reguardless of how many rows the result set contains, there will always be the same columns in the dataset.

Because there are so many combinations of select query, i do not want to make 20 or 30 custom fillby's in the dataset. I want to make an addhoc select query and have the binding source and table adapters work as expected. I have created a query called "FillByCustom" in the dataset designer attached to the DataTable Adapter section.

My question is this.

If i build a select query that returns the desired rows, how do i place it into the adapter in place of the FILLBYCUSTOM select command, such that it all works as expected?

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Sql Server - ExecuteScalar And SqlDataAdapter.Fill Behave Different For Same Query?

Jul 8, 2011

I have a big stored procedure that I run. At the end its supposed to select a singe value to say if it succeeded or not, so I run the query as

Dim Command As New SqlCommand(SqlString, Conn)
Return Command.ExecuteScalar()

Which works. However there is an error in my stored procedure. I know its causing an error because the logic in the stored procedure rolls back the transactions, and after the Execute Scalar call, my transaction count is down to 0 and the my data hasn't changed. However no SQL exception was generated.

The strange part is, I changed the code to grab all the result sets from the SP to see if I could get more information. So I called the same SP like this,

Dim DAObj As SqlDataAdapter = New SqlDataAdapter
Dim CommandObj As SqlCommand = New SqlCommand(SQLString, Conn)
DAObj.SelectCommand = CommandObj
Dim DS As New DataSet()
DAObj.Fill(DS)

When I run this, with the exact same sql as before, executing the exact same stored procedure, this time I get an SQL exception because one of my nested SP calls was missing required parameters. So what could cause this? Why would running it one way produce an error and the other way have the error but not report it? Is the difference on purpose, or some kind of obscure bug in ADO.Net?

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VS 2008 Does Adapter.fill Have A Query Length Restriction

Apr 10, 2010

I have a database with around 100 columns and when i go:

[Code]...

The code works fine with a smaller database, so i was just wondering the problem is that the database is too big and the adapter isn't able to handle such a long query. I was just wondering if anyone knows what kind of limits there are?

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Table Adapter FIll Causing Error With Combo Box (Query)?

Jun 2, 2009

I have the following query that executes when my form loads. It's the rowsource for my combo box. The query is fine and populates the combo perfect, however, when i click into the combo box I cannot click out of it or even close the form. I have tried taking out the line of code that fills the form via table adapter on load and it works fine (opening the form unbound by the main table). Has anyone run into this before? I have another combo box on the form setup the exact same way and this is not happening. I've experimented with different datatypes etc....

code to populate combo box:

Public Shared Function LoadCallSource() As String
Dim sConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Documents and Settingsdiw07My DocumentsDaily Backupsphone memo backend.mdb"

[code]....

If I take out the line

Me.MemoTableAdapter.Fill(Me.Table_Memo.Tables("Memo"), intMemoID)

The Combo boxes do not act up or "Lock"

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Selecting A Particular Query In The Dataset Designer To Be Used In The Fill Method Of The Table Adapter?

Mar 1, 2012

I created a new query in the dataset designer. There are now 2 queries there. The original one and the new one.I also added named parameters in the Where clause of the 2nd query.This is the query in the new one:

SELECT ID, FatherName, MotherName, EmergencyContactName,
EmergencyContactRelationship, Address1, Address2, City, State, Zip,
PrimaryPhone, SecondaryPhone, Emaile.

[code].....

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.net - Should Use LINQ For This Query

Sep 4, 2009

I've been reading a fair bit about the performance of using LINQ rather than using a for each loop and from what I understand using a LINQ query would be a little bit slower but generally worth it for convenience and expressiveness. However I am a bit confused about how much slower it is if you were to use the results of the query in a for loop.

Let's say that I have a set called 'Locations' and a set of objects called 'Items'. Each 'item' can only belong to one 'location'. I want to link items that are under the same location to each other. If I were to do this using a normal 'For Each' loop it would be something like this:

For Each it as Item in Items
If it.Location.equals(Me.Location)
Me.LinkedItems.Add(it)
End If
Next

However if i was to use LINQ it would instead be this:

For Each it as Item in Items.Where(Function(i) i.Location.equals(Me.Location))
Me.LinkedItems.Add(it)
Next

is the second (LINQ) option going to loop once through the entire 'Items' set to complete the query, then loop through the results to add them to the list, resulting in essentially two loops, or will it do the one loop like the first (For Each) option?

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Can Do A LINQ Query Of A LINQ Query?

Mar 24, 2012

Is it possible to do the following? [code] Basically I have one Load_Gridview function that is called on all postbacks, and rather than creating a bunch of different cases.I want the filters to stack.My actual code has more filters set up (4 or 5 of the).It all compiles ok but when I run and try to execute with active checked, or a department selected I get the following error. [code]

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Linq Query In .net?

May 5, 2009

I have below XML file

<?
xml version="1.0" encoding="utf-8" ?><
PageFlow>
<
attributegroup name="Search"><
attributes>

[Code]...

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Put A Sum() In Linq Query?

Apr 18, 2012

I am looking to sum the "Status" field.

Dim _detailRecords As New DataTable
_detailRecords.Columns.Add("y")
_detailRecords.Columns.Add("z")

[Code]....

I'm also wanting to keep this as an IEnumerable of DataRow because I will be creating a datatable from it with

Dim yyyyy As DataTable = query8.CopyToDataTable

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