Values Don't Change In For Loop?
Apr 15, 2012
I have a List of structure's in my VB.NET program, and I'm looping over them, and change the values of the objects in the list, as follows
Dim retvals As List(Of SomeStruct) = parser.RetrieveData(new_path)
For i As Integer = 0 To retvals.Count - 1 Step 1
dim temp as SomeStruct = retvals(i)
[Code]...
When I look into my List of structs after this loop, none of the values were overwritten. Why? I thought that I had references in my list, so if I change reference A to a struct, then reference B to the same struct should see the changes?
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Jul 14, 2009
I am using Visual Basic express edition 2008.I am trying to know if a value in a single dimensional array is repeated in the array. If yes, then multiply one of them by 100. For example:
MyArray (14) = 12, 15, 18, 15, 18, 11, 15, 18, 16, 14, 18, 8, 12, 17, 10
In the above example:
MyArray (1) = MyArray (3) = MyArray (6) = 15
MyArray (2) = MyArray (4) = MyArray (7) = MyArray (10) = 18
MyArray (0) = MyArray (12) = 12
[Code]...
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Apr 16, 2009
I have an arraylist and was wondering how do I loop through and get the values, one at a time.
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Dec 10, 2010
i have a loop that does a simple math function and i need all the values to show up in a single message box. I've got it to when i get individual values minus the start value to show up in separate message boxes but i cant figure out how to consolidate can someone ?
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Sep 16, 2009
'SHEETS For Each ctrl As Control In Me.Controls What am I doing wrong here? When I put in manual text after the line return it fill in but as is it doesn't pick up all the checkboxes under HEADINGS. It does create all the sheets under SHEETS.
Code:
If (TypeOf ctrl Is CheckBox AndAlso CType(ctrl, CheckBox).Checked) AndAlso CType(ctrl, CheckBox).Name.Contains("Sheet") Then
wb.Worksheets("Template").copy(after:=sheet)
[Code]....
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Feb 5, 2011
I would like to ask a code on how to loop using values in an array.To site an example:
Dim arrTarget(Target1, Target, Target3) as Array
Dim i As Integer
Dim endi As Integer = arrTarget.Max() 'Get the sum of arrTarget index
[code].....
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Sep 12, 2009
I'm having a bit of trouble looping through an xml file and printing the attributes, so far i have[code]...
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Apr 13, 2009
I am going to get the values of REASON ID from the following codes.Such as 6 in <REASON ID="6" Description="Cash Reason">5 in <REASON ID="5" Description="Check Reason">.[code]
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Oct 22, 2010
what if you created a pool of numbers: 1 - 21 and then chose a random selection from the pool? Something like the following:[code]This gets rid of those messy if statements and all of those loops.
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Oct 2, 2010
I found this snippet which loops the the old and new values, but I need to figure out the Parameter names that the values are associated with.
Sub DisplayValues(ByVal newValues As OrderedDictionary, ByVal oldValues As OrderedDictionary)
test.Text &= "<br/></br>"
' Iterate through the new and old values. Display the
[Code].....
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Feb 10, 2011
I have 20+ text boxes that are all named like:
TxtCustom1
TxtCustom2
TxtCustom3
[code].....
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Mar 24, 2012
How do I cycle through a ComboBox Values list so I can check each value and select one of them efficiently?
Examples in C# or VB.Net welcome.
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Mar 17, 2009
Is there a way to to combine line's 1 and 2? I only want to loop through a list of the selected items in this listbox. This works just fine, I just wondered if there was a collection of selected values returned that I could use to avoid having to do it this way.
For Loop1 = 0 To MyListBox.Items.Count - 1
If MyListBox.Items(Loop1).Selected = True Then
...
End
Next
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Feb 9, 2010
how to "loop through a datagrid column to add values to a variable
in VB6 it was something like:
do while not .eof
myvariable = myvariable + datagrid1.collumns(6)
loop
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Jan 29, 2010
i 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.
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Mar 21, 2010
I have this code:
Dim x As Integer = 0
Dim x1 As Integer = 210
Dim x2 As Integer = 240
Dim x3 As Integer = 310
Dim m As Integer = 0
Dim x4 As Integer = 480
[Code]...
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Sep 6, 2010
how to, Search for a pixel and replace it well now im stuck on finding out how i could do shades, So im using this code
Dim newImage As Bitmap = New Bitmap(PictureBox1.BackgroundImage)
Dim bmp As Bitmap = DirectCast(PictureBox1.BackgroundImage, Bitmap)
For x As Integer = 0 To bmp.Width - 1[code]....
now how could i have it. say if x,y= any shade of black Then.'Take Action' im making my own paint type tool so im jw how i could paint all black even if it is just 1 digit off from 0,0,0'<- Black' give me some example code on how to loop threw some lines of r,g,b values so i could use that in my function
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Dec 22, 2009
I have 12 textboxes named TextBox1 to TextBox12. How can I loop through these textboxes to assign and read the values? I.e.:
Dim strTextboxName As String
For i As Integer = 1 To 12
strTextboxName = "TextBox" & i
TextBox{i}.Text = ...... ?????
Next
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Jun 16, 2009
I have items in a listbox control that I would like to repeatedly (when it gets to the last one, repeat) loop through and set the text to a label.
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Jul 25, 2008
I'm using VB.Net's Excel component to read Excel file, but the performance is totally slow, since it has to loop through cells to get values. Reading a file containing one sheet with 1162 rows and 105 columns (which is small size compared to my general requirement) already costs more than 5 minutes.1. I want to ask if any of you have suggestion on reading such an Excel file with better performance, except OleDB, cuz most compies here have vesion problem?2. Is it normal that it tooks a long time for Excel component to read Excel file, or is it that I implement the code in a wrong way?
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Jan 28, 2010
I have 50 checkboxes for 50 american states. The user can choose all 50 or only 1( so basically any number he wants). Based on his choice, I want to insert or update the table in sql server 2008. e.g-
Color = blue and chk1=check, chk2= check and chk3 = check (chk = checkbox). now the user wants to ad 10 more states to this or remove these 3 and add 5 more. so u basically get the idea. the table in database looks like this - ID Color State_id there is a table called states, so stateid shall come from there. so how do i do a loop insert or update in vb.net?
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Mar 18, 2011
I have the following code:
[Code]...
The problem I'm facing is that the update happens correctly only for the first of many values. All the other values are calculated and consequently, updated incorrectly in my table. I am almost certain that the looping is what is causing the problem but have been unable to find a way around it.
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Sep 1, 2011
I'm trying to loop through a column of checkboxes to see how many checked values there are in that column. The user has to have 2; no more, no less than 2, otherwise an error should show up.
Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
Dim count As Integer = 0
Dim x As Integer = 0
For x = 1 To DataGridView1.RowCount - 1
[Code] ....
The error message still occurs when I have only 2 chosen in that column. I even tried this
If CBool(DataGridView1.Rows(x).Cells(7).Value = Checkstate.checked) Then
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May 19, 2009
Is it possible to change many labels inside a for loop? Let's say I have labels 1 to 4. Can I do something like:
for i = 1 to 4
label%i.text = some text
next
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Jan 26, 2009
I'm multiplying X*Y*Z in a loop of 200 interations Y is declared as a constant. A timer can cause the loop to pause for 10 seconds.
During this 10 sexond pause I would like to change the value of Y. It needs to be changed only for this run, not a permanent change which can be done in the declaration.
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Apr 18, 2012
I'm trying to change a text that a label displays during each iteration of a Do While loop in Visual Basic. One label (which displays an integer) works fine, however the other stays blank until the loop finishes and displays the final result.
Private Sub btnCalc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handles btnOblicz.Click
Dim W As Single
Dim L As Integer
Dim J As Integer
Dim Y As Double
[Code] .....
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Oct 3, 2009
[code].....
This program asks the user for a number and then an amount to multiply it with and that amount should be added to the initial number. I need to loop because I am trying to display what the amount would be each day for a certain amount of days but in this loop its only calculating for the total .how to get the variables to change value to the updated day. I understand that its just keeping the same value in the variables I just need a push on how to get it to update the values through each loop.
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Sep 13, 2010
I used a sub below in form_load to change all label forecolor but do not work.[code]...
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Feb 2, 2010
I'm trying to temporarily change the value of i in a for loop because I've got a problem when entering data into excel.Every second line is has the .marketName "To Be Placed" so they appear blank like this.
DATA 1
DATA 2
DATA 3
I want to change the value of i so there isn't a blank line between each entry.
vb.net
Private Sub BHorse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BHorse.Click
Dim oMarketsReq As New BFExchange.GetAllMarketsReq
Dim oMarketsResp As BFExchange.GetAllMarketsResp
[code]....
It seems to get into an infinite loop as the way it is, even after I change the value of i back.
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Oct 22, 2010
I want to reset programatically the values of all the labes on my form for example label1.text=1, label2.text=2 etc etc (there are 90 in total)
I came up with:
Dim i As Integer = 0
For Each objcontrol As Control In Me.Controls
If objcontrol.Name = "Label" & i Then
[Code]....
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