VS 2008 - Calculations From ListBox Entries
Mar 18, 2009
I've imported data from a text file using Streamreader and populated a listbox with this in 3 columns. I now need to
a) get a total value from the 'Hours Worked' column (sum) and
b) put in a calculation to populate an extra column for each entry (Gross Pay) where values are not imported but entered as a result of a calculation.
My current code is as follows:
Private Sub btnRefresh_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRefresh.Click
'Program Objective: Display payroll report for National Success Coaches which could be updated unknowingly at any time.
Dim name As String
[Code] .....
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Nov 29, 2009
I have a program where you have three entries, CD name, artist, price and it goes into a listbox and .txt file when closing. I have to have a message box if you enter the same CD name. I have a code to open the .txt file and compare strings but I need to change it to compare only the CD name and not all three entries. Is there a way to do my string compare against my listbox without opening the .txt file?? The program loads the listbox from the .txt file when opening. Private Sub btnAdd_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAdd.Click' adds CD information to the list box
' declare variables
Dim strName As String
Dim strArtist As String
Dim strPrice As String
[code].....
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Jul 10, 2010
I was working with a calculator i made.. and then i was thinking of making all my calculations to be displayed in the listbox..Here is my program for the calculator..
Public Class Form2
Dim Nm1, Nm2, nnn As Long
Dim Opr As String
Dim FF As Boolean = False
[code]....
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Sep 10, 2009
I've read through all the search results for this and haven't quite got it yet. I often get given Excel spreadsheets of file names and have to check through them for duplicate names.I am making an app to do this for me. I've extracted the data from Excel I'm just having issues with checking for the duplicate. I've tried 2 different ways I found online and neither are working for me,
[Code]...
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May 7, 2010
I am trying to delete multiple selected entries from a listbox. When I run the code I have now, instead of deleting all of the items that are highlighted, it deleted all the items in the listbox.[code]
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Jun 20, 2010
I just starting coding in VB.net about two weeks ago so I'm still a begging and I learn best by seeing working code and then adapting it to my situation. That being said, I need help displaying table entries in a listbox. I've successfully created a database in my test application, added it to my Data Sources and used a drag / drop method to add Datagrid View & Details (labels & textboxes) to my application for testing purposes. Now I want to try and display table entries in a listbox.
Example Database:Table: Contact
- ContactID (autonumber) [primary key]
- FirstName (text 50 limit[code]....
Also is there any benefit or down side to creating a database in MS Access, create the relationships & tables, then attaching that database to my application or is it better to create the database in the application like I did in the example above by using the Add New - Service-Based Database option?
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Jun 22, 2010
My program is half a formulator, and half ordering system. Where I get stuck is the ordering system part. In one screen I have 5 check boxes that you can check for which products you want to order. The products you checked then get sent to another screen and put into a list box with a quantity variable that starts at 1 attached to it. Now, if you check the same product again, another time through the program, as of now, quantity accumulates to 2, which is good, that's what I want. My problem is I want quantity to keep accumulating, right now it accumulates to 2, then on a third pass through the program,it duplicates the entry, so now in the list box has the original product and quantity of 2, and another entry that has the product with quantity of 2. 't quite understand how they work. Here's the code:
Option Explicit On
Option Strict On
Public Class OrderRequest
[code]....
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Apr 14, 2012
I have a program with two forms, one that handles the applications controls, and the other with the functions that open a file (csv), open a database, and query the database. The controls on the first form are a list box, three labels (to display parsed csv information), and three buttons (clear database, load database from csv, and load listbox).
The clear database and load database buttons (events) seem to function correctly.On the other hand, the load list box event doesn't function 100% the way I'd want. [And, I can't test the selected index event yet]
The code for the load list box event is:
Code:
Dim db As New DBUpdt 'second form
b.openConnection("weather.mdb") 'open database connection
db.query("SELECT * FROM stations") 'query database
Do While db.moreRecords
[Code]...
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Jan 19, 2012
You see, in my new VB application, I have a form with a TextBox and a ListBox, and I need to make it so that, whenever some text is written in the TextBox, a SELECT operation must be performed in a table belonging to an SQL database, in order to return the elements of a particular column that are LIKE the text I just wrote in my TextBox. The results of this SELECT operation must then be written inside the ListBox.In other words, whenever I have some text inside my TextBox1, I have to do:
SELECT Description FROM Elements WHERE Description LIKE TextBox1.Text (this must be done whenever the text changes)And the results of this operation must be displayed in the ListBox on the side.
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Oct 9, 2011
Just what the title says. I have a listbox with varied entries, all in one format:name, email, phone, age
When an entry is selected, and when a certain button is clicked, I require the entry to be removed from the listbox and the four categories from the entry must each go into their assigned textboxes.
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Jun 11, 2011
I have 7 textbox entries and I would like to add them to a listbox and when I close my application it would save them, I have the code for the 7 texboxes and everything like that has been done, but I just dont know how to add multiple textboxs to a listbox then save the list box so when I close the application and reopen it, itll still be there. I know I need a button to add the list to the listbox, but how do I save them, so theyll still be there?
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Jun 22, 2010
I want to set a certain column to true or false automatically based on what value another column has entered. I managed to get this working by myself using the 'SQL Pane' in VB and testing it by using execute sql but I don't know what to do now. I assumed that I could just save it and it would work from there but that's not the case, it dissapears from the SQL Pane if I close the project (even though it worked fine when I ran the project the first time), so where do I put it/what do I do with it in order to get this to work?
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Feb 24, 2011
But task to use vb.net for school project. I want a code to help me add a No fo Months(this is an integer) to a datefield to do calcualtion and the result display in a textbox as a date. eg I have 2 fields: Months and startdate, the third field which is the result in a date format. eg 6 months to make a payments, the payment start from 01-02-2011. i want small code which would determine the enddate of the payment period. am getting a problem putting the code together
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Feb 19, 2009
windows service app I am developing to audit events in the Windows Security Event Log. I am using the EventLog class to read entries from the "Security" event log. I have set the log to raise events when an entry is written so I can parse the data. Here is where my problem comes in. If I run the service on Windows 2003 I can get all the data I need from each entry, but when installed on Server 2008 the EventLogEntry ".message" property comes back with useless data like this, "The description for Event ID '4738' in Source 'Microsoft-Windows-Security-Auditing' cannot be found." Under Server 2003 the message property has good data. Using the Event Log Viewer in Server 2008 I can see that it is rendering the correct data, but I am having a heak of a time doing the same. The "replacementStrings" property has the corresponding data that I need, but it appears to involve some other steps to get the data localized to the event provider, but I do not know how to do that.
I also checked the registry HKLMSystemCurrentControlSetServicesEventlogSecuritySecurity on both the 2003 servers and 2008 servers. They are identical execpt the 2003 has an entry the 2008 server does not:
String Type: GuidMessageFile
Value: %systemroot%system32NtMarta.dll
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Jan 13, 2011
I have an Access database that has thousands of records. The fields in the database are EMPID, FIRST, LAST, JOBTYPE and PAGES. I would like to know how to loop through the data table and for each individual EMPID to calculate the sum of the PAGES for each JOBTYPE.There are four JOBTYPE's: "E", "K", "O" and "R".Here is some
Dim WebAllEmployeeQuery As String = _
"SELECT ELPallEmployees.[EMPID], ELPallEmployees.[FIRST], ELPallEmployees.[Last], ELPallEmployees.[JOBTYPE],
[code].....
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Aug 16, 2010
example of how to create a custom EventViewer log, define the source, and write an entry or custom thrown exception from a windows service? I haven't been able to write entries from my service without it unexpectedly stopping because the logs filled up or getting an securityexception from the code below.
[Code]...
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Jun 27, 2010
I created a simple database that has 3 tables & 2 joint tables for data entry purposes.The tables & fields are listed below. All items that appear in red are the primary keys
Employee
EmployeeID
- FirstName
[code].....
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Jun 2, 2009
VB 2008
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'Dim Reader As New StreamReader(Application.StartupPath + "/pbucon.log")
'TextBox1.Clear()
Dim Reader As New StreamReader("C:/Documents and Settings/Dorinda/Desktop/pbucon/pbucon.log")
Dim Line As String = Reader.ReadLine()
[Code] .....
I am trying to parse a log file and only display new entries containing the word "say". I have this set on a button click event, but I prefer a timer or something, but the textbox flashes everytime the timer ticks so I am using a button right now..
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Feb 13, 2010
1 when my listbox returns resaults it only brings back 10 how do I set it to return lets say 500
and question 2 is when I click on my links in listbox it's not opening webpage as I would expect it...
This is my code
[Code]...
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Feb 19, 2010
I'm having trouble figuring how to code the calculations for a Pocket PC application that calculates the cost of a cell phone bill. From a Pocket PC the user should enter the number of minutes used during the past month, in order to calculate the cost of the cell phone bill. The plan allows 300 minutes for $29.95 per month. For each minute over 300 the cost is $0.17 cents per minute. Tax and Fees are $4.85 a month.
1. User enters the number of minutes used during the past month.
2. Based on plan rate of 300 minutes for $29.95 and 17 cents for each minute over 300 calculate the cost of the bill including the fixed cost of $4.85.
3. The user must be able to initiate the calculation and display the individual charges and the total cost of the cell phone bill.
4. The user should be able to clear the number of cell phone minutes, the individual charges and the bill total
If negative number is enterd for the cell phone minutes, the user should be advised and asked for a valid entry If non numeric value entered for the cell phone minutes, or if left blank the user should be advised and asked for a valid entry.Application is deployed on the Pocket PC emulator built in VS 2008
Enter # of Minutes ________ (user enters)
Regular Minutes Charge ___ (29.95)
[code]....
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Jan 31, 2009
I have data entries in my database that have a common field. For example:
account_id type user_id
1 new 1
2 old 3
3 new 1
4 old 1
I am using a query like this(mysql): SELECT account_id, type, user_id FROM table WHERE user_id = 1
This is just all theoretical. The problem that I am having with this is it is only returning the first result in this case account_id 1. How can I get it to find all the results with the user_id 1 because in the way I am thinking that it is failing is that it is finding only the first result and then ending?
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May 26, 2011
problem that i am facing is i want to add array of object as a single item in listbox. in vb6 i was using this Label1.Caption = Label1.Caption & Mid$ (strInput, intI, 1) & " " List1.AddItem (Label1.Caption) i was using label. caption to store object but not work in vs2008 because label.text only take text and left other values
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Jan 26, 2009
I am having problems with copying from one listbox to another and keeping the paths of the files in the listbox's. At the moment i have two listbox's, listbox1 shows the list of files without the directory paths showing. Listbox2 is used to add items from listbox1 which work ok but what i need is to be able to preserve the directory paths to each file. how to do this and have searched high and low for a solution without any luck.
I have worked out one way of doing it but i think there is a better way of doing it as the reverse does not seem to work. So basicly i want listbox1 to list the files without the paths and pass it on to listbox2 so that the files can be copied to temp directory as they are being add to listbox2.
Below is my
[CODE]...................
Routine to add items from listbox1 to listbox2: I have created another listbox3 (which is in bold), which is hidded under listbox1 and holds all the paths to the files and is use to copy the files from there original directory to a new directory.
[CODE]...................
Routine to add items back to listbox1 and remove them from listbox2. I have created another listbox4 which is hidden under listbox2 which i was trying add the paths from listbox3.
[CODE]...................
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Feb 1, 2010
I have 2 listboxes on my form.Listbox 1 - populated with "available" field namesListbox 2 - populated with "selected" field names.There cannot be the same field name in both listboxes - it's either one of the other.The logic I was going to apply was to populate Listbox 1 with every field name ... and then as I populated Listbox with the field names which the user has already selected, remove the corresponding item from Listbox 1.
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Mar 17, 2011
Trying to drag/drop an item from one listbox to another on a windows form.Listbox1 is bound to a table and the data is populating correctly.Listbox2 is empty and has allowdrop set to TRUE. The goal is to drag items from LB1 to LB2.Problem is when I click on the item in LB1 it will not allow me to drag the item to the other box. As soon as I click on the item in LB1 the mouse pointer turns to a circle with a line through it.
<CODE>
'''LB1
Private Sub lstISA_MouseDown(ByVal sender As Object, ByVal e As
[code].....
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Sep 25, 2011
probs a simple answer but my mind is blank atm. I have this code to move all items from listbox3 to listbox1 but it wont move them unless i select 1, then it moves all items.
[Code]...
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Sep 18, 2007
I have a DataGridView which displays info from a Database. I need a couple of the columns to be able to do basic calculations such as +, - etc - nothing more complicated really. I am a bit stuck as to how to gte this working.I have tried the code below with no joy:[code...]
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Aug 7, 2011
I am doing homework, but i've done the work already. My Issue is, I cannot get my program to compile the calculations for the payments properly. Maybe I'm just too tired to see it, but It should be working from my view. Here is what i have so far...
Module MortageCalculatorWK5
'Loan Amount Input
Dim LoanAmount As Decimal = 200000
[Code].....
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Jun 6, 2011
I'm very new to programing and am having problems trying to perform some calculations with a list. I have read in an array into a list with a count attached to each item example: "xxxxxx(intcount)". What I'm trying to do it use two xxxxxx(intcount)'s at xxxxxx(intcount+5) and xxxxxx(intcount+25) and use these two variables to calculate yyyyyy(intcount) but it isn't working. I understand this may be a stupid question but could someone please point me in the right direction.
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Jun 11, 2012
I'm developing an app in which there's hundreds of different calculations involved and would like for my app's admins to be able to tweak these calculations by specifying the formulas.For example, my database table contains price and quantity. One of the columns 'X' might contain "(price * quantity) over the past 7 days". How can I allow my app's admins to change the calculation from "7 days" to "14 days"?
Is there some way to make calculations dynamic within VB.NET or do I have to rely on stored procedures and write some code to alter those procedure if a change is needed? What are the best practices in this type of a scenario?Ideally, I would like to use something similar to the "Tags" box used when posting questions on here to bring up the available fields and add mathematical operators in between them to perform calculations. It might be adding more complexity, but would be great if an existing calculation isn't overwritten so that it could be used in building a new formula.
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