Performance Concerns Between DataTable And SqlDataReader To Fill Data With FlexGrid
Nov 5, 2009Which one is more faster between DataTable and SqlDataReader while I'm trying to fill Data into FlexGrid with VB.NET?
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.net - Performance Concerns Of Instantiating Multiple Classes In One Form?
Nov 6, 2009I would like to know how will performance go when I instantiate multiple classes in one form.e.g
Public Class frmClass
Dim obja As New ClassA
Dim objb As New ClassB
[code]....
Improve The Performance Of Reading Data From Excel And Writing To Datatable?
May 21, 2011I want to import data from excel and move that to Datatable in VB.NET 2008. I wrote and working but its taking too long time.. for 1500 records its taking 4.40 min.
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Fill A NEW DataSet's DataTable With Data From A DataGridView?
Jan 6, 2010fill a NEW DataSet's DataTable with data from a DataGridView? I am generating a data report that uses that "new DataSet." I need to go from a DataGridView to a DataSet because i need the person to be able to perhaps edit the information before its inserted into the report. my process to generate the report is...
- fill datagridview with advanced join sql
- allow user to edit datagrid if necessary
- put datagrids modified information in new dataset
- set report's databinding source to new dataset
- generate report...
Create A Datatable And Try To Load Sqldatareader
Apr 6, 2010Scenario is this; I've a sqldatareader query that seems to be returning nothing when I try to convert the sqldatareader to a datatable using datatable.load.So I debug into it, I grab the verbose SQL query before it goes into the sqldatareader, just to make sure it's formatted correctly. I copy and paste this into SQL server to run it and see if it returns anything. It does, one row.I go back to visual studio and let the program continue, I create a datatable and try to load the sqldatareader but it just returns an empty reader. I'm baffled as to what's going on. [code] Ok I've done a loop to count the rows of the datareader before using the datatable.load method. In my test query I'm getting 4 rows (the correct amount) in the datareader, as soon as I use the datatable.load method it says the datatable is empty, what's going on?! So it seems a datareader is a one-way thing, iterate through it to get the row count and it's essentially empty as far as any other bit of code is concerned. Didn't realise it was forward only and wouldn't 'reset' once read through.
View 1 RepliesTableadapter.fill(datatable) Fills The Row That Was Not Added To The Datatable
Aug 6, 2010I am trying to add NewRow to the database by using datatable in dataset, but before I do that I want to make sure that row is not already there. I create new row for the datatable I am working with, fill it with information. I fill datatable with the row from database that has the same primary key as my NewRow by using tableadapter.fill method, but when I do that my NewRow that was never added to the datatable is filled with information from database(and not information that I assigned to it). I count rows in my datatable before I fill it and it's 0, so why is my NewRow affected by Fill command? (I am using VB.NET 2005 Framework 2.0)
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Increase Load Performance From A Relationship Table Adapter To Fill In Datagridview In Vb
Apr 22, 2011i have problem when i generate my program the program takes time till in my datagridview from table adapter in which i already create in a dataset any way how to make the program fill the records faster and decrease the loading time when fill in the datagridview? [code]
View 1 RepliesData Set - Result Of Query Is Bond In Flexgrid ?
Jan 19, 2010I have this code in vb6 the result of this query is bond in flexgrid how can i do this in vb .net using data grid.
Dim SQL As String
Dim rs As ADODB.Recordset
'SQL = "SELECT PO_Header.OrderID, PO_Header.RefNo AS [PO Num], PO_Header.OrderDate AS [Order Date],Category.Description + ' ' + SubCategory.Description as Department, " & _
[CODE]...
Error On Send Data From FlexGrid To Excel
Sep 8, 2010I am trying to send Flexgrid Data to Excel By using below Code,But it gives Error:
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Get Performance For Comparing 2 Large DataTable's?
Oct 13, 2011DataTable1“ About 16 000 entries“ coming from SQL[code]...
I have tried using a NOT IN clause in my SQL query with all the entity numbers from table 2 in that query but it takes over 10 minutes to execute.
Using a For Each loop and comparing each row takes about 3 minutes
How To Improve Reading Performance From A Datatable
Oct 25, 2010i have a datatable with about 10000 rows and few columns (4)I have noticed that the process of reading a big table its quite slow..is there a way to improve performance in reading a datatable?
View 15 RepliesLoop Through Dataset.Datatable Slow Performance In .Net 1.1?
Mar 16, 2009I have a program in where I need to loop though the entire dataset.datatable. I takes a long time. What is the alternative I can use to do the some job but faster?
View 4 RepliesPerformance Side Linq Or Dataset.Datatable?
Apr 30, 2009from a performance point of view is it faster to work with linq to sql or dataset.datatable?
View 6 RepliesSqlDataReader Getting Rows When No Data
Jul 29, 2010This is incredibly urgent, I need to present this application in 3 and a half hours.My application checks against a data source to see if a value exists in the database and changes values depending on whether or not the value in question was found.The problem is that I've run the sql query with the value in question in SSMS and no rows were returned, and yet, my DataReader says it has rows.[code]val will only be returned True if the NumberToCheck (in this example 3235553469) exists in the database.Having copied the value of NumberToCheck into SSMS and testing the query there, I can verify that the query does work as expected.No, I can't populate a DataSet because of the volume of information in the table (+/- 9.5m rows). Even with the 'WHERE' filter, the query is too heavy on resources and eventually ends in an OutOfMemory Exception which is why I went with a DataReader.
View 4 RepliesSqldatareader Data Into Dataset Columns?
Jan 14, 2010I am running queries using sqlcommand and am trying to get the results from sqldatareader into a dataset table. It works fine when loading the datareader data as a row into the dataset table and writes it to a crystal report.I would like to have depending on the query results have the data in the appropriate columns and it only happens if the results are from all fields.
Dim CommandObj2 As New SqlCommand(sql, cnn)
sqldr = CommandObj2.ExecuteReader()
While sqldr.Read()
Dim dataRow As DataRow = ds.Tables("NTable").NewRow()
[code]....
MsgBox(ds.NTable.Rows.Count, MsgBoxStyle.OkOnly, "Records Count")My dataset and table have the same name, NTable. Question again is how to populate the dataset columns accordingly.
Can't Fill A DataTable
Jan 6, 2012I can't seem to get a DataTable filled.url...I'm using VB, Visual Studio 2010.I keep getting an error on this line: adapter.Fill(dt)The Microsoft Jet database engine could not find the object 'Book1.txt'.Make sure the object exists and that you spell its name and the path name correctly.The name of the file and the path should be perfectly fine, although i did change the code just a bit:[code]I read somewhere that you have to 'drag a data adapter object from the Toolbox onto a form or component'.I don't have a DataAdapter in my Toolbox.I did a right-click and selected 'Choose Items.It is nowhere on the .NET Framework Components.
View 4 RepliesCreated Datagridview Control Used To Display The Data Using Sqldatareader?
Apr 15, 2010I am having problem with datagridview. Actually I have created datagridview control used to display the data using sqldatareader. My problem is that How can I fill the data in textbox control when user selects the row in datagridview using coding. For e.g. my form is having a) Datagridview and displaying values of columns: Name, Address, City, State etc and textboxes: txt1, txt2, txt3, txt4. Now if the user selects any row from datagridview the selected value of Name is filled with txt1, address is with txt2, city with txt3, state with txt4. I am directly dealing with database with using DataAdapter.
View 1 Replies.net - Fill DataTable From DataReader Row By Row
Aug 25, 2010i want to fill a Datatable with a Datareader row by row but get an exception because the reader's columns have a different order than the Datatable's columns.
Why and how does a Datatable loads itself with a Datareader correctly, even so it has a column collection with different order?
I need to calculate values for every row so i dont want to load the Datatable completely but row for row. It has 25 columns so i dont want to set it all manually.
There must be a chance to load/fill/add a new row from a datareader without having the same column order(reader.GetSchemaTable?).
Following is what i have but what doesnt work:
Using reader As System.Data.SqlClient.SqlDataReader = command.ExecuteReader
'next line works(configInfo.DataSource is a Datatable)but is inappropriate
configInfo.DataSource.Load(reader)
[Code].....
How To Fill DataTable Via For Loop
Feb 23, 2010I am using a SQL query to fill a datatable from 2 associated tables. The first table has Products and the second has associated addonpackages. When I loop through my Products I am able to get all of the addonpackages for the first product but after that the datatable is only getting populated with the last addonpackage for each product. ie:
product 1 - all 6 packages are added tp the datatable
product 2 - only package 6 is added to the datatable
product 3 - only package 6 is added to the datatable
...and so on
My query follows. Why I am getting all of the info for the first product but just the last item for all others. No matter which product I would query first, I get all of the associated data with it but only the last for all others.
SELECT Products.ProductNumber, Products.Name, Products.Mnemonic, AddOnPackages.PackageNumber,
AddOnPackages.Name AS PackName, AddOnPackages.Mnemonic AS PackMnem
FROM AddOnPackages RIGHT OUTER JOIN
Products ON AddOnPackages.ProductNumber = Products.ProductNumber
WHERE (Products.Name = @ProdName)
ORDER BY Products.ProductNumber, AddOnPackages.PackageNumber
How To Fill DataTable With 11 Columns And 1 Row
Dec 30, 2011I fill a data table with 11 columns and 1 row.
Columns/ User Pass
Row / **User2054** 1234
I have a Label named lblUser and I want to put the value=User2054 from my Table(Collumn[0], Rows[0]). How I can fill it?
Datatable Getdata Performance - In-line Table Valued Function In SSMS Takes About 6 Seconds To Return 11088 Records?
Mar 25, 2011An in-line table valued function in SSMS takes about 6 seconds to return 11088 records. The same function in VB .Net 4.0 using TableAdapters.InputTableAdapter.GetData (Created with data set designer) takes about 15 minutes complete.Both are executed from the same workstation.Why does this discrepancy exist?
Workstation:
Windows XP SP3, 2GB
VS2010 Ultimate
.Net 4.0 Framework
Server:
SQL Server 2008
Adding Objects To A List Fails When Retrieving Data Using SqlDataReader
Mar 19, 2012I'm stuck on a problem that I haven't been able solve. I'm making a visual basic program that communicates with an SQL-database. The problem emerged when I tried to retrieve data from the database with the help of SqlDataReader and save data from every row to a list (Customer) with the help of Add-method. It turned out that eventually the list had correct number of objects, but the information was the very same in each object of the list.
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Multithreading - .NET DataGridView Load Data From A Background Worker And SQLDataReader?
Mar 28, 2012I have a DataGridView that I'd like to load with data that I'm retrieving from a SQLDataReader running in a background worker as the data comes in (it's a query that takes a long time). My goal is for the user experience to be similar to searching for a file in Windows where the results appear in the list as they come in and you can still interact with the window.
I have it working with a background worker and data reader and I'm trying to add the row from the SQLDataReader.Read through using the BackgroundWorker.ReportProgress method. Everything technically works but the flicker is crazy and the form is unusable (probably not because the GUI thread is blocked but just because there's so much going on...) How do I make loading the datagridview "smooth"?
SQLDataReader - The .read Process Returns No Info - Data To Retrieve
Jan 18, 2010Imports
System.IO
Imports
System.Windows.Forms
Imports
[CODE]...
I don't understand why nothing is being returned from the SQL)
Fill A Combobox With Values From A Datatable?
Feb 13, 2009I want to fill a combobox with the values that I have in a datatable. How can I do that? Below is the code for the population of the datatable:
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Forms :: Fill Datatable In The Background?
Aug 16, 2011I would like the main form I am designing in VB.net to appear as quickly as possible. As a result I don't want to fill a datatable in the load event but instead fill it as soon as the form appears, in the background.Then when a user clicks the button a listbox can quickly be populated.
With this in mind I called a function to fill the datable from the _Shown event. The trouble is that the form freezes until the query executes, making the process pointless for my needs.
Does anyone know how to keep the form active while the datatable fills silently in the background?
How To Fill Column Of Existing DataTable
Mar 28, 2012I have a table like this
col1 col2 col3
a b
c d
I want to fill the 3rd columns.
Read From Database And Fill DataTable
Jun 1, 2012I'm getting a set of data by a datareader and assigning to a string. Now I need to fill the datatable columns with the Query fields. The datatable is connected to a grid to display the filled data.
query is : strSQL = "SELECT EmpCode,EmpID,EmpName FROM dbo.Employee"
Datatable columns are EmpCode,EmpID,EmpName.
I need to read the query and assigned to the columns of datatable and fill the table.
Me.DtShifts.Tables("NonAllocated").Clear()
Me.DtShifts.Tables("NonAllocated").Load(dr)
C# - What Are The Different Methods For Injecting Cross-cutting Concerns
Nov 10, 2009What are the different methods for injecting cross-cutting concerns into a class so that I can minimize the coupling of the classes involved while keeping the code testable (TDD or otherwise)?
For example, consider if I have a class that requires both logging functionality and centralized exception management. Should I use DIP and inject both required concerns via an interface into the class that requires them? Should I use a service locater that I pass to each class that will require some cross cutting functionality? Is there a different solution altogether? Am I asking the wrong question entirely?
Change Datatable Fill Or Get Command Text?
Apr 12, 2011I was wondering if there is a way to change the Fill command text of a datatable before issuing it.I need this because the table I am opening has over 15 thousand rows and it hangs for a while in the network when filling the table. So I would like to tell it what to SELECT instead of getting the whole table and then applying a filter.If there's a way of doing that without changing the fill command, it will also work for me.
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