VS 2008 Proper Way Of Working With Percentages And DataGridView And Dividing By Zero
May 31, 2011
What is the proper way of working with percentages and DataGridView and dividing by zero..In my code I am attempting to divide two numbers, sometimes one of the numbers is zero..Then I need to add a column to my datagrid, I think i need it to be decimal? So i can sort it later. I had it as a string and everything worked fine excpet i couldnt sort properly.[code]If I change column to Double it handles it fine, then i am not sure how to read the value as a percentage?
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Nov 13, 2009
I have dragged and droped a timer control "tmrGetMappingXML" from the Common Controls Tab in Tool Box. The issue that I am mentioning also appears for the Timer Control present in the Components Tab in tool box.
In the form Load I have written:
HTML
tmrGetMappingXML.Interval = 3600 '1 Hour = 3600 Seconds
tmrGetMappingXML.Enabled = True
tmrGetMappingXML.Start()
The timer interval is also set in the design time to 3600 seconds. But the Tick event of the timer fires continuously every second.
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Mar 18, 2011
I am trying to make a program that can calculate the percentage of people passing an exam. There are buttons for each letter grade, and working label counters for each time you press a button. Each button looks like this, except replace the letter with the appropriate one.
Private Sub btnA_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnA.Click
Static intA As Integer = 0
intA = intA + 1
lblA.Text = intA
lblPercent.Text = (lblA.Text + lblB.Text + lblC.Text + lblD.Text) / (lblA.Text + lblB.Text + lblC.Text + lblD.Text + lblF.Text)
End Sub
My problem is that the percent does not equal what I get when I put the exact same numbers into a calculator.
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Mar 8, 2012
The application I want to make is what I would call quite simple, you will have two text boxes where you enter in two team names.
i.e.
Team 1 v Team 2
Then below a little search button. And then when you click the button it will show a percentage of whom is most likely to win. Now I know that I would have to most likely enter something like
Team 1 v Team 2 WIN Team 1
Team 1 v Team 3 LOSS Team 1
Team 1 v Team 4 WIN Team 1
In some kind of script for this to work so when you search for
TEAM 1 v Team 2 it will show WIN Team 1
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Feb 22, 2010
I have a stopwatch in my program. I start the stopwatch with the start button I created. When I stop it it gives the results of the time in a label that I have named labelTime. I have a Calculate button I have created. I also have a label I have named calcResult. I want to click the Calculate button and divide the stopwatch result (labelTime) by 60. I want the results of this calculation to be displayed in the label calcResult. I keep getting errors saying labelTime is a string value. I believe I will need my calcResult to be a Decimal.
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Jul 30, 2009
I'm trying to do this division and the result to be displayed on a eight decimal number.
Dim r1 As Integer
Dim r2 As Double
r1 = Val(TextBox16.Text)
r2 = r1 / 60
TextBox18.Text = FormatNumber(r2, 8)
The value or R1 on this case is 273.4 but it varies according with the result obtained so I can not allocate a constant number to r1. The problem is the result that I am getting is 4,55000000 instead of 4.5566666
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May 18, 2010
I am fixing up a visual basic program using visual studio 2005, specifically in visual basic. I am currently attempting to format the datagridview used to display data from a database. The values from the database being displayed are a mix of integers (used for displaying information such as number of units sold) and floating point values (used to display revenue, etc). I need to format all the values to display as integers (by simply truncating the decimal places, not rounding) as all (including the values that should already be integers which are appearing with two 0s following the decimal place). I have used the round function as follows round(value, 0, 1) which as I understand should get rid of all decimal places by simply truncating them, however I am still left with two 0s after the decimal place. Next, I went to the designer view and edited the columns property of the datagridview so that they are all set to be numeric with zero decimal places, yet the decimal still remains. I followed that by going back into the code and change any CType() that were decimal to Integer and still no change.
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Jul 17, 2010
When the datagridview's selection mode is set to "RowSelect", the HitTestInfo Type property only returns column header as the type and not the cell that is being clicked on.Is there a way to keep the selection mode as RowSelect and still detect which cell is being clicked on?
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Oct 2, 2009
how to convert a string that is entered in a column to proper or title case. For example, user enters "now is the time". Code will capitalize the first letter of each word "Now Is The Time". In VBA I would execute the following code in the afterupdate event: me.fieldname = strconv(me.fieldname, vbProperCase).
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Feb 13, 2011
why vb 08 help are not getting in proper way. instead getting help for vb 2005 which is not compitable with vb 2008. i m user other vb 8 user must be facing similar problem
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Dec 21, 2010
Is this the correct syntax to delete a record from a dataset? [code]
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Jun 8, 2010
I am not sure of the proper, or best, way to use Settings and Resources. For now I use the default project wide My.Settings and My.Resources. I have a class that I would like to reuse in other projects, so adding project wide settings or resources in each project doesn't sound proper, nor does creating constants and variables within the class itself.I'm guessing there is a way to give a class its own resource file, and maybe even settings file, but I'm not sure how to do it. I tried adding a resource file with the same name (but with .resx extension) and I got a weird error saying I was trying to edit a resource that is apart of another project. I continued, but it didn't seem to be what I wanted and I wasn't sure how to access that new resource.
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Jun 20, 2009
I want to display some text for a user - blocks of text about "vendors" - that can be scrolled.
I might want the first vendor to be a different color - or be bold.
I might want certain fields in the "text blurb" about each vendor to be bold - or underlined - or a different color.
In VB6 I would have used a RTB - would that still be the solution??
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Feb 11, 2011
I have many textboxes that I need to have display percentages. I have used a masked textbox extender and the percentages display fine. using 99.99% as a mask and number as the mask type.Now my problem is that i want it to be converted to a decimal when i save it to the database e.g 50% saves as 0.5 and then when it comes back from the database it must display as 50% again. This is needed for numerous calculations. IS there a way to do this?
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Sep 21, 2011
I have a scroll bar that I need to have increase / decrease by half a percentage and then display it in a text box.Min is 5Max is 15rt Display Value is 10So far all I have been able to come up with is this, but it only increases / decreases the number by 1% instead of .5%.Private Sub RateHScrollBar_Scroll(sender As System.Object, e As ystem.Windows.Forms.ScrollEventArgs) Handles RateHScrollBar.Scroll
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Sep 19, 2010
I had designed a simple form with Groupbox and some checkboxes (colors)where I need to program the following :When I checked one checkbox in this collection I need the previously checked checkbox to be unchecked and the new one to be checkedbut what I'm getting is not like this where after writting the following code :
Private Sub obj_checked(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkred.CheckedChanged, chkblue.CheckedChanged, chkbrown.CheckedChanged, _
chkgreen.CheckedChanged, chkwhite.CheckedChanged, chkyellow.CheckedChanged
[code].....
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Aug 24, 2009
I took a look at System.Security.Cryptography.MD5 class about using a checksum for a UDP program i am making.Basically i want to use it, to ensure the server is receiving what the client sends it, in a way that the server can make note of it receiving properly without having the client keep track of how many proper payloads the server received. The reason i need a checksum is because the client is sending a random hex payload, so i cant have the server predict what it should receive the same way as i have it working with the sequence number.I dont fully understand how i could implement this to my code. I believe i should make a public property in my packet class, but im having trouble implementing it with the way i coded my program. [code]
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Oct 6, 2011
I have a thread running on my application that checks a database every so often to decide whether or not to update nodes in a treeview.
Each treeview node represents a document and I have an open button that opens the document for the user.
When the document is opened, I wanted to suspend the thread that refreshes the node list until the document is closed.
I have MyThread.Suspend and MyThread.Resume. But the document viewer is on another thread.
I created functions for suspending/resuming the thread in the application. I have delegates in the viewer to call those functions from another thread. But I'm still getting an Error. "Thread is not user-suspended. Cannot be resumed" or something of the like.
But I realize that Suspend and resume are obsolete functions, so what class or objects should I be looking into and if it didn't take up too much of your time, a small example as well?
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Dec 4, 2009
I have a few classes, one is a form, the other is the source of the datagridview. I want to be able to sort the columns of the datagridview by clicking on the header. Here are the classes that I am dealing with:
Imports DiscoveryByte.AddTools.Misc_Tools
Public Class ViewDiscoveryFlashCards
Private DBBindingSource As New BindingSource
[code].....
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Jan 17, 2010
I'm making a console game that shows some data:
#: Item Name Item Slot Cost Item Price
in that order. The thing I want to do is to make it come out in nice even columns...but I can't seem to make it do that. It comes it out in nasty uneven rows that don't look attractive...
Basically, here's what it looks like now:
1. Sword Slots: 2 Price: $40
2. W. Stick Slots: 4 Price: $1
I want to get each column to line up nicely with the other (since I control the size name).
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Jul 12, 2010
I want to divide a form into 2. Side a I want buttons. Side b I want a form to display certain info.
Example: Button on side a (Add Employee). If a user click this button, on side b is info about adding a new employee.
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Aug 3, 2011
I have a fairly small double and a fairly large double. When I divide the large one by the small one and display it with Console.WriteLine, it always shows exponential notation. Can I display the non exponential notation form?
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Mar 14, 2009
Is this formula right just asking to see if I can make a file downloader on my own with fully working progress bar.
var/var2 * 100 = answer
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Aug 10, 2009
My application has no static number of pictureboxes. I want to add picturebox to array control.
[Code]...
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Nov 19, 2009
How easy it is to "split" a bitmap into separate parts?Here is a bitmap that was generated by a program - the red pixels that you see are purely red, there are no other colours.I want to know if the left side is "redder" than the right side. (Actually I want to be more precise than that (but I can figure that out on my own))So, I think that "splitting" the bitmap up into sections like this: would be the best way to do it then I can count the red pixels in each section.Here is the part of the code snippet that produced the bitmap you see above:I think I might be able to modify this easily to count pixels, if I know how to split the bitmap into section thingies.
Dim are_identical As Boolean = True
Dim eq_color As Color = Color.White
Dim ne_color As Color = Color.Red
For x As Integer = 0 To wid - 1
[code]....
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Jan 15, 2012
I have 3 combo boxes on my form
1. Doctor Start Time
2. Doctor End Time
3. Doctor Appointment Duration
I want a 4th combo Box that will Start from Doctor's Start Time upto Doctor's End Time with the interval of Appointment Duration eg. Suppose the Start time is 08:00 and End Time 10:00 with 24 hr clock the appointment duration is 30 mins then the 4th comboBox should Display
08:00
08:30
09:00
09:30
I have done this coding on the basis of Appointment Duration
Dim da As DateTime = FormatDateTime("00:00")
cboAppTime.Items.Clear()
If txtDuration.Text = "15" Then
[code].....
The above coding shows time from 00:00 to 23:00
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Aug 17, 2009
i am controlling the hue and saturation of the backcolor of the form with scrollbars:
Private Sub tbHUE_Scroll(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tbHue.Scroll
Dim r, g, b As Integer
HSVtoRGB(r, g, b, tbHue.Value, tbSaturation.Value / 50, 255)
[code]....
i would like to know what is the purpose of dividing by 50?
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Dec 10, 2009
Using Excel Automation classes I am seeking to save an Excel file as a delimited text file. The examples given in the MSDN library refer to versions older than Express 2008 with (apparently) different syntax options for FileFormat.Based on the snippet shown, I get a COM exception error (800A03EC). Other variations produce the same error.
Am I improperly applying the Automation features?
Imports System.IO
Imports Microsoft.Office.Interop
[code]....
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Feb 16, 2012
im trying to learn how to made stuff with currency.For example:I divide 10.000$ by 12 Months, rounding with 2 decimals i have 833,33 $.If i multiply 833,33 $ * 12 i got 9999,96 $, so there is 0.04 of possible loss.
Rounding the 9999.96 with 2 decimals of presition i got 10.000 $ but that's what i don't want since 0.04 is a loss.Im using SQL Compact 4.0 as database, the price_month table is decimal(18,2)
Here is my code:
Dim price as Decimal = 10000
Dim pricemonth as Decimal = Math.round((price/12),2) ' 833.33
Console.Writeline(pricemonth*12) ' 9999.96
Console.Writeline(Math.round((pricemonth*12),2)) ' 10000
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Apr 4, 2012
I've came across to quite an unusual problem with dividing integers with double variable. I've created For loop where to sum-integer interval -double is added. When sum reaches certain number text is displayed as showed below:
[Code]...
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