.net - Manipulating Textbox Variables In Calculations?
Jan 2, 2012
I have some code where I am trying to use variables in a tabpage. The first tabpage only has one text box for user entry (miles.text) and a button to do a calculation: traveltime = mileage/speed. The value from miles.text is stored into a variable called mileage while the speed used is stored in a variable called speed (me.speedtextbox.text).
Ordinarily, doing val(variable.text) works like a charm and it's not doing it in this case. When the user enters 100 for the mileage, it should be divided by 65 (the number in the database) and, therefore, the answer should be 1.53 hours. In my case, I'm getting "infinity" and whenever I do anything else with the variable, I get "when casting from a number, the value must be a number less than infinity." But it is! It's only 65 and I double-checked that the dataset said that too, which it does. Not sure why I am getting this error.
I am unable to get the correct calculations out of my variables. If I input say fgh2 and enter 5 for monthly sales everything displays fine. enter fbd2 and 5 for monthly sales again everything is fine I get a result of 10 but as soon as I deviate from that formula like ftp1 and 3 in the monthly sales textbox it comes back as 13 in the newCarLabel when it should be 3
Option Explicit On Option Strict On Option Infer Off Public Class MainForm 'global variables
All - I have a form that has two databound textboxes on it. To keep it simple, they are: Quantity & Value For BOTH of these text boxes, the TEXTCHANGED action will multiply the two and present the result in a LABEL. This works 100%.
For BOTH of these text boxes, the TEXTCHANGED action will multiply the two and present the result in a LABEL.This works 100%.NOW - If I choose to add formatting to either of these text boxes, the calculation will not work. As one might guess, QUANTIY is formatted as NUMBERIC with zero decimal places and VALUE is formatted as CURRENCY with 2 decimal places.
It's being some years since i actually wrote a program in VB, last time was VB 6.So it's being a long time, and things have changed a bit.And i am still very rusty, so i need to get back into it.I got a few problems which i cant remember very well.1st question.I got several text boxes, in these text boxes there will be prices of products.The very last text box is inactive, and is supposed to show the total of all of the above.I have to declare the text boxes to contain numeric values only, so there will be no mistake when doing the calculations.But i cant remember what it was, and what the best option is to add up all the values from the text boxes.
Essentially I am trying to replicate the Windows 7 (In-Windows) activation key TextBox form. The Form where it will auto capitalize letters, remove or deny all non alphanumeric characters except dashes every 5 characters that will be auto-input.I assume this can be done with a fairly complicated replacement Regular Expression but I cannot seem to create one to fit the needs.
This is an Example of what I have right now, but it creates an infinite loop as it removes all characters including dashes, than adds a dash, which changes the text and removes the dash again.
I'm trying to set multiple variables using a textbox.The way I'm trying to do it is have each variable seperated by a space so like this:#If textbox1.text.contains("test") then set variables from textbox1.text for each " " in textbox1.text define new variable(value, string1, string2, int1, int2, int3, int4, int5)#End If I just don't know how I would code something that can set these variables from a single line of text in a textbox seperated by nothing other than just spaces.
i'm having is I have a 4 comboboxes with values connected to the items. I have textboxes set up so the values of the items show up. The items are concatenated ("" & processor(0))The processor variable contains the number, so how would I add numerous variables together to display in another textbox.
I'm facing a problem with my current member card reader development.
I'm reading the card number (just a serial number of 4 digits) with a card reader. this seems to work fine (even converting the text string to integers).
This number is then put in a query to find the exact record that corresponds with this number
I recieved a gift recently visual studio 2010 ultimate a nice suprise I have been repairing and building PC's and networks for years working in local shops and buisnesses, but always wanted to learn programming so my GF purchased this for me nice suprise. So here is my beginner question. I am making a program that will take check info ( check number, amount, date and person or buisness wrote to). I have no plans on using it just trying to learn variable structures and arrays and thought this type of program was a good start. Now I would like to take the text of a text box in runtime and use that to input a new check number into the variable structure. Just so I am not confusing anyone I will write the basic code
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So what I would like to do is use a textox labeled check number to add check numbers into the checkrecord structure instead of having to add them into the code manually is this possible?
I have a form with a few text boxes, one of which has it's contents stored to a integer variable.
The value stored will end up being one of a few numbers ranging from 12 to 98, and I need to the same number of new variables as the number in the textbox.
Can I automate the creation of new variables based on the value stored, or do I need to define the max number required and just ignore the rest when using less?
I made a simple textbox with a submit button and a label and when you type in something into the textbox and hit the submit button what ever you typed in the submit button is suppose to show up in the label box but i type in DaFallenAngel in it and it only shows D why is it only showing D and not the full name? [code]
I have 10 forms and say 5 text box's on each one so a total of 50 of these text box's. But the program is only using one of these forms only (user selects the 1 Form out of the 10) so I was wondering can these forms Share the input text box's? I am thinking NO, if so then the only thing I can do is just use 5 shared variables that all the forms can utilize.
I'm trying to design a game using vb.net window application, my game is sokoban, a logic game where the character pushes boxes to the destination.I have already programme my picture to be move by my direction key, I trying to find out if it is possible for picture box to push picture box like when the character(a picture box) move to the box(a picture box too), the box will move also. and also the logic for creating obstacle for the game, as the picture that i have programme can move beyond the page, I'm trying to lock the obstacle in, so when i move the picture, it will be block by the picture box.
i'm creating a game like text twist. that when i press letter a, i need to determine which picturebox contains letter a and display it to different location. that also goes to the proceeding letter a's. for example, i have a jumbled letters "aamba". in my code, it only gets the first letter a and removes it form the screen, it's nowhere to be found. and it won't recognize that i still have other letter a's i'm pretty sure about the location that i set it to be placed.here is my
(it's kind of brute force i think) ElseIf e.KeyChar = Chr(97) Then counter1 = 0[code].....
I need to be able to read audio files and manipulate them from within my own program (similar to how Audacity does it). Now, I'm not asking for something with a thousand effects and such, I just need the minimal as far as audio manipulation for .net goes. I really just need to be able to figure out pitches and frequencies being played at what times and the ability to move them all around.
I'm creating a program that displays data from a Access database in DataGridView, and I'm able to "call" the database and display it in datagridview normally, but I need to be able to take the data from 3 separate columns and average them together, within VB.
My table basically displays 3 grades for a student, one column for the student's name and the other 3 columns for 3 separate grades, I need to be able to take the 3 grades from the same row and average them together, then display them in a separate column within DataGridView.
Here is my code so far, but this only displays all the records without the average:
Quote:
Public Class Form1 Sub UpdateGrid(ByVal sqlStr As String) Dim dt As New DataTable()
I am using the Print Document to create the impression in vb.net...Anything I set a certain number of records per page however see the other pages just like the first,some help to handle these records correctly in the leaves?
My script is pulling some information (filename, date, &c) from a server that contains only (nearly) identical excel files generated by a separate application whenever it is used. The goal is to find out who is using the tool and how often.
I need help with two things: extracting info from within the excel file, and appending the results to the SAME excel file each time it's run instead of creating a new file each time.
I am building a quiz application which has 5 categories. I am saving details like name, category and score to DB. Table where all data is saved looks like :
Name Category Score John Windows 10 Tom Mac 5
On the start page i want to disable/enable categories if user has/has not took quiz yet (ie. if John has already completed Windows quiz but hasn't Mac then enable Mac Quiz, disable Windows and show Windows score).Whats the most elegant way of retrieving these values from database and then passing them to variable or boolean? What if search returns NULL (if quiz was not taken by John) and manipulating output from SQL Database? I am using vb.net 2.0 and SQL server 2005 and its an asp.net application.
I'm trying to make a program that can handle menu order in restaurant.
In this program, there are Main form (frmOrder), Starter Form (frmStarter), Entree Form (frmEntree), and Dessert Form (frmDessert). Each category (Starter, Entree, and Dessert) contains 4 menus, and each forms other than main form have label for name, price (label), and quantity (textbox).
Main Form have 4 buttons (3 of them opens respective form of Starters, Entrees, Desserts. Last button calculates total), and it has big label that displays all the ordered menu. By default it has current time and date, so any ordered menus are supposed to be displayed on separate line (with quantity, name, and price with dollar sign).
Below is the code I wrote for frmOrders
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I tried to see it works, but lblTape.Text (which is the big label that displays ordered menu) do not change. I did saw lblTape.Text got value it supposed to (item quantity & item name & item price) but it doesn't change when I close form and return to Main form. I'm not sure where I got trouble to end up like this...
I have a couple applications that store data in the registry for persistence.It works great when running in Windows XP, but since upgrading to Windows 7 I've noticed that it fails, basically saying that the permissions are inadequate.
If I disable the UAC it seems to work fine, but I don't want to do that.
Dim regKey As RegistryKey Try regKey = Registry.LocalMachine.OpenSubKey("SoftwareTagLookup", True) If regKey Is Nothing Then
I have a file full of last-names separated by commas and then first-names.
Smith,Bob Chicken,Ronald Car,Anastasia
Code: gc permissions.csv|% {$_.split(",")[0]}
I'd like to grab the first character of the first name and then pre-pend it to the string of the last name. The general idea is to find the user ID that's stored in Active Directory, in my company it's the first letter of the first name and then the last name.
Then I'm trying to add these users as read-only on a specific directory.
I have developed an application using VB.NET, Visual Studio 2008 and the SQL Server database. Now I want to ignore the database (it has 1 table as customer (name,password,hour,minute)) as I don't want my client to install SQL Server separately or other overheads.I am planning to do the whole using file handling in VB.NET (manipulating the data in files itself, for example change username, password, etc.). As I am new I don't actually know the proper way and of course need assistance.
Last year (2010) I came across a FANTASTIC command that allowed me to take a string of variables with a common delimiter and break it all back out into separate variables (possibly an array) with one statement.
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As long as the delimiter was a unique specifiable character, this one-statement command could break it out into elements. my memory and point me in the right direction.
I have code, shown below, that works all except for 1 thing: The variables being passed byRef get passed, but once modified in the else section of the "if me.invokerequired" code of RecordData, the variables are never updated in the calling function. To reiterate, the calling function does not receive the updated data that is in the variables custid and amt.When debugging, I see the data change in the else section of "if me.invokerequired", but once it returns from the callback the data is missing.[code]
product number | product name | dosage | description | price | remaining box(es) 0023 amoxicillin 50mg none 50 50
i am having problem in my buy button. how can i manipulate the value in the remaining box(es). for example, i select the item named amoxicillin, and i entered 5 on my textbox. when i press the buy button the value in remaining box(es) will be 45.
i am using a webbrowser control on a windows form to display streaming video from cameras at different locations.i can get the image to display on the webrowser but my problem is that there are other links and texts that are displayed on the webpage.
