Loop In DataRowview Using For Statement?
May 26, 2009I am a new with using datarowview
The problem here is how to loop in dataRowview using for statement
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Making A Next Statement Into A Loop Statement In Visual Basic?
Jun 8, 2009y friend and I are re-learning Visual Basic, and we are stumped on this bit of code.
For intAsterisks As Integer = 0 To intLine - 1
lblAsterisks.Text = lblAsterisks.Text + "*"
Next
How For Each Loop Statement Actually Works
Dec 8, 2011I am trying to understand how a for each loop works and am having some trouble. I am trying to create a program that will query a sql database, pull back the information and store it. I currently having it writing to a text file, and would like to take the information (such as name) and compare it to another list where the name is equal. However I am not exactly sure how the for each statement really works. I have looked at numerous sources and it doesn't make since to me as you can probably see from what I have put in here.
HTML
Public Class Form1
Public Sub newarrest()
Dim strsports As New System.Collections.Generic.List(Of String)
Dim employeelastname As New System.Collections.Generic.List(Of String)
Dim cnPodaci1 As New SqlConnection
[Code] .....
If Statement Or Where Extension With A For Each Loop?
Nov 18, 2009I was wondering which of the two code samples would be more efficient (or is the difference between the two negligible)?[code]
View 4 RepliesWhile Loop Vs If Statement When Printing?
Jul 28, 2010I'm practising printing, and doing fairly well - not as hard as I was thinking.
My question is: is it better/preferable to use a "while..." loop instead of an "If..then" statement when printing.
All my printing code is in various If statements (if PgNbr = 2, If PgNbr = 3 etc) but I notice in most of the examples and webpages I read that a lot of printing is done in a "while..." loop
For Loop Statement With .count Method
Dec 7, 2011For loop statement with .count method
View 1 RepliesSyncLock Required Before If Statement Or For Loop?
Oct 2, 2009If completedOrders.Count <> 0 Then
For i = 0 To completedOrders.Count - 1
SyncLock completedOrders
'Do some work, for example this:
Dim text As String = completedOrders(0).getCN & " " & completedOrders(0).getDeviceName & " "
End SyncLock
Next
End If
Is a synclock needed before the if statement or for loop? In other words. When you call methods like .length or .count is it necessary to synclock them or can another thread be writing to it at the same time. CompletedOrders is a generic list of a class.
VB Update SQL Statement Inside For Loop?
Jun 27, 2012Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim s As New Staff
[Code]....
Basically I am trying to update each record with 2 random numbers each time the button was clicked,my problem now is, the system will update the record but the data was wrong. Example, by right all data should be different (randomly string) but for some row it was updated with same data but in randomly, something row1 row2 row3 has exactly same data for column 1 and 2 then row 3 has distinct data, second time, row1 row2 same data row3 ro4 with different data. It is in random sequence. When I add a MsgBox to do testing in the For loop the data was updated correctly with all different data.
Put 10 Radiobutton Values In Insert Statement With While Loop
Jan 29, 2010i have 10 radio buttons that have yes/no values. These are options to one question, so need to in the database under 1 record. so - question1 yes, question 1 no, question1 yes and so on. i want to use a while loop or some other loop to take all these values and insert them or update them in the database for that particular question. i m new to programming. the db table is ID, question, Answer. so it will be 1 question1 yes, 2 question1 yes, 3 question1 no.
View 2 RepliesTerminate A Do Loop Without Using An Exit Or Continue Statement?
Mar 11, 2010I would like to terminate a do until ....loop when future value is greater than 1000 without using a Exit or Continue statement.
Do Until inti > intMonths
decFutureValue = (decFutureValue + decMonthlyInvestment) * (1 + decMonthlyInterestRate)
If decFutureValue > 1000 Then
[code]....
VS 2008 Using Greater And Less Than Parameters In A For Loop Statement
Jun 21, 2010I am having a few issues with a For loop statement, code below:
Dim y1 as integer = "12"
Dim y2 as integer = "24"
Dim y2a as integer
[Code]....
Problem i have is that it selects all records that have a value equal to or less than 24 rather than the records that have a value greater than 12 and equal or less than 24. This appears to be an error i am making in the use of greater and less than?
Loop Statement - IF Process Is NOT Running - Delete The Files
Aug 12, 2010I am currently teaching myself the caveman code of Visual Basic (VB.net). Apparently I fail at If-statements or something, because I cannot get this to work...
[Code]...
Performing Like Statement In For Each Loop To Check For Specific Item
Jun 17, 2011Is it possible to define my list of strings like in 'good old' VB60, to use only on ebyte of memory for each character? .NET always seems to store any string as unicode, which doubles the required memory. The case is that I have a huge list of strings, all of the same size. It is about 50.000.000 items, 12 characters each. You can imagine I am running out of memory in no time. I tried converting them to arrays-of-bytes but in that case I loose the possibility to perform a "LIKE" statement in a FOR-EACH loop to check for a specific item.
View 6 RepliesVS 2005 Adding INSERT INTO Statement Inside A Loop
Jun 1, 2011if I have the following vb code,
for i = 0 to dTable.Rows(i).Count -1
Dim sql As String = ""
Dim strConn As String = ConnString
[Code]....
When Remove 'Not' In 'Loop While' Statement Program Runs Indefinitely
May 11, 2009[code] The problem in my case, this is not working with this code. All I need are random numbers outside the above boundaries.Please note when I remove 'Not' in 'Loop While' statement, the programme runs indefinitely!!
View 11 RepliesLoop Statement - Display A Table Giving The Balance On The Loan At The End Of Each Month
May 17, 2010I am trying to create a program in vbfor this problem: "A TV set is purchased with a loan of $563 to be paid off with 5 monthly payments of $116. The interest rate is 1 percent month. Display a table giving the balance on the loan at the end of each month". It must have 1 button and a list box that displays successive balances, contains loops to balances, loop code includes output to the list box, List box displays 2 columns (one for month and one for amount owed) and 5 months are displayed and the amount owed for each. The Amount Owed should go down each month from month 1 to month 5 where month 5 will equal to $0.00
Here is my code so far but somehow the 1 percent interest i cannot get to add on each month so I am not getting the write answer.
Code:
Dim rate As Decimal
Dim loan As Double
Dim pay As Double
[CODE]...
I have attached a jpeg of what the end result should look like when code is being run.
VS 2010 Read Multiple Text Files In My Resources By Using A Loop Statement?
Sep 29, 2010I'm trying to create a "quiz" program in VB. The questions to be asked are placed inside text files and have the following format:
[code]...
> VB thinks that im trying to open a file named, what im trying to do is open a txt file which have a file name similar to the value of integer.
labelQuestion.text = variable.Readline().
Stop A Loop Statement In VB And Not Perform Display Changes Until After Call Procedure Is Valid And Complete?
Apr 19, 2010I am having problem with the coding of this (endless loop) and formatting of summary boxes before tests are complete that should not happen. (the overall goals is to have a separate validation procedure that does not calculate or dat displays are not performed until after call function is complete and valid. The validation that takes place are that two boxes are filled in - one is text and the other is a numeric value. (using vb 2008)
[Code]...
Ctype Datarowview To Integer
Feb 29, 2008Is it possible to change a datarowview object to an integer?
View 3 RepliesListbx Display Datarowview?
Mar 31, 2011[code].....
View 3 RepliesRetrieving Value DataRowView In Combobox?
Mar 11, 2010I have a problem in my code I can't seem to find a solution for.. One combobox is being filled up with a datatable like this:
CbUsers.Datasource = usersDAO.getUsers()
The getUsers() returns a datatable from my acces database. Users have a name and id, I want to use both of them but it should be something like this:
CbUsers.DisplayMember = "username"
CbUsers.valueMember = "userid"
In other words, I want to see the user name, but work with the user ID. So far the code worked, but it only displays stuff.
Now, in a method I want to use the id of the selected user in the combobox but that has been given me some trouble.
If I use this line I get a DataRowView: CbUsers.selectedValue
When I try to retrieve information from it, it throws an exception. I've tried lots of different code and it never worked..
If I put the DataRowView in a local variable and do this:
id = drv.items(0)
I only get exceptions..
way to work with a combobox that displays usernames but works with their id's?
.net - Get An Integer Value From A List Box Populate With DataRowView?
Jan 6, 2010Is there a way to get an integer value from a DataRowView? I have a list box with datasource set to a binding source. I would like to be able to do this:
dim num as integer
num = lstBox.SelectedValue
But I receive an InvalidCastException:
Conversion from type 'DataRowView' to type 'Integer' is not valid.
This is how I fill my list box:
myDataAdapter("SELECT CustID FROM Customers", cn)
myDataAdapter.Fill(myDataSet, "Customers")
myBindingSource.DataSource = myDataSet
[Code]....
I have one list box this works for and one it doesn't, so far. The only difference that I notice is: the one that works, the Query in the data apapter retrieves and auto number from my access table, the one that does not work, the Query in the data adapter retrieves a number.
Or, is there another way I should go about this?
The application that I am trying to make is a form with a list box for CustID, OrderID, ItemID, and others. The CustID is from table Customers, OrderID is from table Orders, and ItemID is from table Items.
Combobox Selected Value Return DataRowView?
Apr 8, 2011I set combobox.datasource to a dataview item (so that it binds to a table), When I get return value from combobox.selectedvalue. Error was returned bcos it is of type"system.data.datarowview" I don't know why commonly its return value as text
The code :
If ldstList.Tables(0).Rows.Count <> 0 Then
With CbStatus
[code].....
Listbox Returns System.datarowview?
Jan 3, 2011why does my listbox returns System.Data.Datarowview?can you tell me what i need to change or adjust?
Private
Sub txtAchternaam_TextChanged(ByVal
sender As System.Object,
[code].....
System.Data.DataRowView In Combobox?
Mar 24, 2012I have a problem when i add new data then when i choose course in combobox example i will choose items in combobox "Bachelor of Science Information Technology" then when i save. then the result in course is "System.Data.DataRowView". What should be the correct Codes?
View 6 Replies.net - Object Reference Not Set To An Instance - Trying To Get DataRowView From A ListItem?
Dec 9, 2011I am trying to get the bound values from a row in a ListItem. I have a button on each row that when clicked will perform a task (sending an email message to the person who's name and email address is in that listitem row. So, I have an event handler tied to the listview, and I am trying to get to the underlying datarowview to extract the data items.Here's what I have in the event handler:
Protected Sub lvUsers_ItemCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewCommandEventArgs) Handles lvUsers.ItemCommand
Dim diCurrentUser As ListViewDataItem = CType(e.Item, ListViewDataItem)[code]...
Now, it fails at the line where I am trying to access the contact_email element in the DataRowView object.What an I doing wrong?
Convert Datarowview Data To String Format?
Jan 16, 2012I encountered error message "Conversion from type 'DataRowView' to type 'String' is not valid" when listbox1 item was selected. Listbox1 items were imported/binded from Access.
View 5 RepliesError :Databinding System.Data.DataRowview
Oct 27, 2011Im using datagridview in asp.net.When im trying to add row using footer template in find error coming up.I have corrected syntax and column is in Database.
<ItemTemplate>
<asp:Label ID="lblMembershipName" runat="server" width ="150px" **Text='<%# Eval("MembershipName")%>' >** </asp:Label> </ItemTemplate> <EditItemTemplate>
[Code].....
Same Error :Databinding System.Data.DataRowview?
May 25, 2009Im using datagridview in asp.net.When im trying to add row using footer template in find error coming up.I have corrected syntax and column is in Database.
<ItemTemplate>
<asp:Label ID="lblMembershipName" runat="server" width ="150px" **Text='<%# Eval("MembershipName")%>' >** </asp:Label> </ItemTemplate> <EditItemTemplate>
[code].....
Dataset - .NET Combobox Displays System.Data.DataRowView?
Jun 29, 2011I used this code:
myCommand = New SqlComman("SELECT RackName FROM tblRack", myConnection)
myAdapter = New SqlDataAdapter(myCommand)
myAdapter.Fill(myDataSet, "tblRack")
cboRack.DataSource = myDataSet.Tables(0)
then in the combobox i got the display "System.Data.DataRowView".