Adding Objects To A List Fails When Retrieving Data Using SqlDataReader
Mar 19, 2012
I'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.
[Code]...
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Jun 30, 2009
I am trying to retrieve the correct value from an ArrayList of objects (.NET 1.1 Framework):I have the following defined:
Public AlList As New ArrayList
Public Class ItemInfo
Public ItemNo As Int16
[code].....
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Nov 9, 2011
I have an Object structured as follows:[code]I thought this would work but I keep getting the following error: Object reference not set to an instance of an object.
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Mar 5, 2012
I get the following error when trying to use this code.If you see that something is wrong with my design then tell me. I want to do this the best I can.Also, I am trying to figure out how to add specific players and coaches to a school. I have coaches and players in separate lists just like the school.
Private Sub populateTable()
For i As Integer = 0 To SchoolList.Count - 1
DataGridView1.Rows.Add(SchoolList.Item(i))
Next
[code]....
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Aug 3, 2010
I need to pupulate a Grid, but i like to do like Microsoft SQL Server Management Studio, when you make a Select to a table with bounch of rows, it start show the result but in the botton still retriving data.So you can start looking the data, not like you get the data and after you get the last row you can asing to the Grid.
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Aug 17, 2011
I'm new at JSON and i am currently struggling with a problem parsing JSON data in a list of objects.The data that i am trying to parse is generated by the facebook graph api, and looks like this :
{
"100001621071794": {
"id": "100001621071794",
"name": "TEST1",[code].....
I know that this is not an array, because it is missing '[' and ']'. But when i replace the '{' and '}' with '[' and ']' i'm getting an error because of an invlaid matrix.
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Aug 7, 2009
I want to retrieve an object by using a string representation of the objects name. For example lets say i want to change the font of 3 labels on a form programatically. Instead of changing the font property for each individual label like so:
Label1.Font = FontDialog1.Font
Label2.Font = FontDialog1.Font
Label3.Font = FontDialog1.Font
I want iterate through the labels in a For..next loop like so:
[Code]..
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Aug 9, 2011
I want to add data to a column in excel but I need to do it without inserting a row. I want to type the data in the top cell, execute an event, have all of the data shift down, and then clear the cell that I typed the data in. I can't insert a row because I have calculations that are based on each individual cell in the list in adjoining columns. I can get this to work by inserting a row but can't get the loop quite right without doing it this way.
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Nov 30, 2010
how to add together integers from the end of a list array based on certain criteria. example: a list of students assignments and grades, and im trying to add all of the grades from a certain student up based on the student id from the user.
the student table looks like this:
111 H1 09/12/2010 17
111 P1 09/14/2010 42
111 H2 10/02/2010 18
[Code].....
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Jul 29, 2010
This 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.
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Sep 11, 2009
I have a class that inherits from control with some custom properties added, and I am using a propertygrid to change the properties at run time. I don't want any of the inherited properties of the control available in the PG so to each of my class properties I amassigning a CategoryAttribute and I am adding the same categories to the PG.BrowsableAttributes collection. When I add a single category to the BrowsableAttributes collection it works fine, but when I add more than one, none of the categories show up in the PG. I am wonding if there is a simple setting in the PG, or if I have missed something setting it all up.
[Code]...
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Jan 14, 2010
I 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.
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Apr 15, 2010
I 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.
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Jul 17, 2009
Lets say my program requires a password of "vbforums" to bootup. The user enters "vbforums" and clicks enter to proceed to the program.I want to make a registry value in the registry under my program with that text. And now on load up i would want to be able to check to see if the correct password is in that specific spot in the registry.I have never fooled with the registry so im pretty lost, i tried doing a bit of searching on the forums but couldn't find anything. Anyone know how i would do this?
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Mar 28, 2012
I 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"?
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Nov 5, 2009
Which one is more faster between DataTable and SqlDataReader while I'm trying to fill Data into FlexGrid with VB.NET?
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Jan 18, 2010
Imports
System.IO
Imports
System.Windows.Forms
Imports
[CODE]...
I don't understand why nothing is being returned from the SQL)
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Jun 2, 2011
I would like to create list of child objects from list of parent object. Like If i have list of bookingroom which has one member room then i would like to create list of room from it.
eg. code:
Dim BookingRoomList As List(Of BookingRoom) = New List(Of BookingRoom)
Dim RoomList As List(Of Room) = New List(Of Room)
BookingRoomList = BookingRooms.FillGrid()
[Code]....
Is there any short cut method instead of iterating over for earch?
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Jul 20, 2011
I'm having a bit of a 'brain doner' moment here
I have a list of Objects. Each of these Objects contains a list of other Objects (pseudo code) :-
Private Structure Object1
dim Name as string
dim ListOfObject2 as List(Of Object2)
[Code]....
I need to sort the list of Object1 by the Value in Object2. I have a comparison class which sorts Object2 by its Value nicely.
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Nov 2, 2009
I'm currently trying to add all the sections of a specified .ini into a combobox.[code]Now that's my section in the .ini, but it's scrambled and placed into multiple lines. I just want it on a single line as said in the .ini.Does anyone have any idea how to get values between brackets "[hi]" and place the value between the brackets into the combobox items?
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Dec 22, 2010
I have 2 classes
Public Class Shipper
Public Property ShipperID As Long
Public Property CreateDate As DateTime
[Code].....
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Nov 23, 2011
I'm trying to create a list of days(integer) from a list of dates(date).
I tryed to do this....
[Code]...
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Jul 17, 2009
im trying to retrieve a value from a session of List. wat i did is i created a new List of string and save it to a session... e code extract is sth like this
Dim count(5) As String
session.item("aCount") = count
how to retrieve the value one by one...
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Nov 7, 2010
Am using MS Access as my back end and I am having a table called "Dept" with 2 columns (dename & cname). In Vb.Net when I click a command button, all the data's of the first column should be displayed in ListBox1 and the Second column in ListBox2. I do not know how to proceed
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Jun 7, 2011
I am trying to create a simple Word doc that when the user presses the button it takes the information in the boxes and tosses it into a template style paragraph. But my issue is that I have two combo list boxes as seen in the picture. I want to have two values in the drop down list as seen in the labels next to them but for the life of me I can't figure out how to do this in Word 2007. In Visual Studio this is much easier but I am work and need to snap this out for the folks at work. Is there an option that I can choose in the properties where I type in the values for each drop down or do I have to add them in at run time?
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Jan 24, 2010
I need two seperate lists, which every item is Integer, String, Bitmap - and one which every item is Integer, String String. However I don't know how to do this, or even where to look - I've googled for custom objects and custom object lists. What I'm trying to do is this.Custom Object1 is Integer, String, Bitmap Custom Object2 is Integer, String, String
In one thread I'll be adding items to List1(Of Object1), and processing them, and adding the results to List2(Of Object2), however I need to be able from other threads to look at the list and say only give me the items where Integer = (my thread ID), is this possible? Any help, or even links to information that would be relevant to this request would be helpful?
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Mar 23, 2010
I have manage, to allow user to browse through their files and insert an image path into a local database. The program will then retrieve the image from the image path and will be stored into ImageList. The Listview1 will then add the pictures of Imagelist into the ListView1.Items. Now my question, how can i retrieve back the path of the image when the users click on the selected image from the ListView?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Table = "ItemList"
[Code].....
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Apr 26, 2010
I'm using this code to retrieve the list of files from a FTP server
Dim request As FtpWebRequest = WebRequest.Create("[URL]")
request.Credentials = New NetworkCredential(username, password)
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails
Dim response As FtpWebResponse = request.GetResponse()
Dim responseStream As Stream = response.GetResponseStream()
Dim reader As StreamReader = New StreamReader(responseStream)
messagebox.show (reader.ReadLine)
It gives me alot of information that I dont need, I know that I can use:
request.Method = WebRequestMethods.Ftp.ListDirectory
Which only retrieves the file name but when I try to change it, it gives me an error. Error number 550. ListDirectory so I can only get the file name?
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Jul 8, 2011
I know that there is a method for doing this but I can't find what that would be. In my program I am looking to allow the user to create new elements(with code behind them) by entering a certain keystroke say ctrl+v(doesn't matter) and adds a textbox
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Feb 7, 2011
would i do something like "dim txt_whatever as new textbox" or would i do something else?
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