how to go about populating some text boxes with results from calculations. To be more specific, I'm trying to do some trig to calculate various parts of a ci0rcle and will be populating any two of the text boxes then click on a button to get the missing values. I was thinking along the lines of a loop until all values have been calculated.
View 14 RepliesI have to use the financial.pmt method and display the calculations to certain text boxes?
'Tyler Fritzinger
'Mr. DeCava
'VBI
'Quick loans project
'9/22/11
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How do I start writing a program that has 6 text boxes. A person would enter a member number if they have one, number of movies rented at $1.80 a piece. A Text box should then display Total Rental Price, and if a member number was entered, a 10% discount is given (the total of the discount shows up in another text box) and after there discount is applied the Amount Due is displayed in yet another Text Box.
My boxes are named:
memberNumberBox
moviesRentedBox
rentalPriceBox = $1.80
totalPriceBox
discountBox
amountDueBox
This is all supposed to happed when the customer clicks on a calculation button named: Button1
This is what I have so far, but I don't even know if this is correct, as I am getting 1 error relating to a name not being declared. Please help and clue me in to where to start!
Public Class Bonanza
Private Sub memberNumberBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles memberNumberBox.TextChanged
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I'm writing a program for my class, which pretty much is an energy cost calculator. It takes 4 inputs from 4 text boxes and multiplies them, and the result is the cost. Well, now I have to come up with a way to check for empty text boxes and display a prompt to enter a number. I've tried inserting multiple codes to display a prompt and to no avail nothing has worked, I also receive the error "when casting from a number, the value must be a number less than infinity" error.
View 3 RepliesI have a small requirement and that is as follows: I am calling a stored procedure and based on the results from the stored procedure, i want to display the data into textboxes. I am using DataSet and DataAdapter for the same. Can anyone help me. My code is as follows:
Dim sqlStripCmd As New SqlCommand("prcAdt_mwo_strip_det_sel", connection.conn)
sqlStripCmd.CommandType = CommandType.StoredProcedure
sqlStripCmd.Parameters.Add("@strip_no", SqlDbType.Char, 3).Value = txtMwoStpNo.Text
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I am getting the data and am able to display it into a datagrid, but how do i put it into textboxes.
For some reason the exception is caught sometimes it's not?Here is the code:
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I am populating text boxes when a user selects a company name from the cbo box. When I make the first selection everything looks good, but when i make another selection the text boxes do not clear and repopulate with the new values. Here is the code in the selected index change event.
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I am building a form in access database.
I have a combo box which is linked to a query which is looking up a unique reference number from a table called Tbl_Submitted_Requests.
What I need the form to do is auto populate the other text boxes when the user selects the unique reference from the combo box. How can I get the text boxes to auto populate with the data that is associated with each unique reference?
Recently we have run into an issue with the Math.Round function. We have developed an application in VB.Net 2008. The executable is compiled to use .net framework 2.0. We have deployed the package to our users and at some sites we get a different result in a computation using Math.Round.
View 7 RepliesFor some time I hav been struggeling to find out way my functions dosent calculate the correct values. If you take my Struct and paste it in.Add six textboxes with two that you can add decimal numbers to rest is just to show the results And two buttons for calculating..[code]
View 4 RepliesA toolbox in my project uses text boxes to hold the paramaters of some useful tools.[code]...
View 2 RepliesI have done this in Php with a function before. I just don't know how to do it in VB.I have a character sheet creator for a game I am making. What I am wanting to do is write a single function, where in you click on a button and it will pass the text box name (so that it knows which text box to edit), as well as the value inside of the text box (to make sure that the new character stat ceiling is taken into account).
Private Sub Button_Click
AddtoValue(Textbox1,stats)
End Sub[code].....
Essentially, I need to know what to put for noidea, and noidea2, like, byval or byref or what?
x = 4.2 - 0.1
vb.net gives 4.1000000000000005
python gives 4.1000000000000005
Excel gives 4.1
Google calc gives 4.1
What is the reason this happens?
I am working on making a Windows based application within Visual Basic 2008 Express that could potentially be used for a music school as a project. This application is connected and bound to a Microsoft Access database. Within this application I have a form for adding a new appointment reservation. This form has a combo box that the user can select the lesson type (eg. "I want a piano lesson"). Upon being changed, a list box would be populated with the names of all instructors that have that selection as either their primary or secondary talent.So, my database is bound, the query is written (correctly...i hope), and I don't know how to 1) select the table column that I want displayed in the list box and 2) actually display the query results within the list box. Is this making sense? Probably not, bu
Private Sub cmbLessonType_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmbLessonType.TextChanged
'populate the lboInstructor box
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I am using the following code for populating the combo boxes in my application. It is really nice. If any one requires, may use this. It takes three parameters. The first, the name of the Combo Box and the second, the SQL Statement to populate the combo box and the third is the number of column to be displayed (from the SQL statement)
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The error it has is that when one of the text boxes is changed the code changes all of them triggering every single function to activate. Is there a simpler solution other then recoding it from the start? also each different Private Sub is identical basically.
Public Class Form1
Private Sub K_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles K.TextChanged
Dim T As Double[code]...
I know the code is very brute forced & sloppy but its the only way i really know how to do it.
I am building a form that will eventually list a group of functions on the left. If you drag a function onto the form, it will create a listbox and a label at the loction you dropped it to. If you drag a function into a listbox, it will add that function as a listbox item. I have this working kind of. The problem is that once I create a new listbox, I am no longer able to add items to the previous ones. Here is my code:
Public Class Form1
Private MouseIsDown As Boolean = False
'rivate Functionlist As ListBox
[code]....
Heres my issue, I am retrieving data from xml and populating a DataSet with the results into multiple DataTables but i have an issue where an item is repeated in my input data and it is causing it to exception because of the constraints imposed between these tables. how can i determine if a row exists prior to adding the DataRow and thus not include it in my DataTable?
View 1 Repliesi want to add calculations in 1 private function I have a textbox named lbldisplay.text when i enter a number.. the number is shown as a string so.. -private number1 as string when i press the button "+", "*", "-", or "/" the number1 must return into a double. So the number in the textbox is now a double.. so for example i press the + button, and i need to fill in a new number.. but this new number is also a string!
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I was trying to increase the date value in a textbox automatically be 1 but wont let me do it. I have try to go through the Help but couldnot get something meaningful (or let say i do not get where to go).
View 2 Repliesdoes VB.NET include the Mathematical Integration/Derivation functions in the Library? If so where are
they, I couldn't find them? If not, any third-party libraries you would recommend?
I am making a calculator that accepts large number (represented as strings) and performs basic math functions on them. So far I have Add and Multiply figured out.
Here is addition
Private Function Add(ByVal Number1 As String, ByVal Number2 As String) As String
Dim num1, num2, r, total As New Integer
Dim sum As String = ""
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I saw something like this in the code bank but the examples there were from VB6(?) and were hugely inefficient (compared his Add and Multiply examples to mine, his having way more code and loops.)
I am trying to follow the book 'Sams teach yourself VB 2008'. It was going well until the end of hour 4. For exercise 1 I have created the form with a button and two text boxes, but cannot work out the code I need to move text between the two boxes. The Object Browser does not seem to help - am I reading it wrong?
View 14 RepliesI am using the NPV() function in VB.NET to get NPV for a set of cash flows. However, the result of NPV() is not consistent with my results performing the calculation manually (nor the Investopedia NPV calc... which matches my manual results)
My correct manual results and the NPV() results are close, within 5%.. but not the same...
Manually, using the NPV formula:
NPV = C0 + C1/(1+r)^1 + C2/(1+r)^2 + C3/(1+r)^3 + .... + Cn/(1+r)^n
The manual result is stored in RunningTotal
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The MSDN page example clearly states that the initial expense should be included in the cash flows list.
I was wondering if someone could explain the logic behind the MidpointRounding enumeration for the Math.Round function. The two enumerations are AwayFromZero and ToEven where, based on the given precision, the former will return the nearest value away from zero toward positive or negative infinity (based on the value's sign) and and letter will provide the nearest even number.
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I need to execute scripted text formulas. I believe that in VB 6 and/or VBA there was a method EVAL() that did the job, eg: [Code] As it seems, such a method does not exist in VB.NET. [url] The method works fine but due to its comprehensive layout its not that fast (as i need to call it myriad of times) Does anyone have a SIMPLE, FAST, straight forward math expression method? Or anyone knows how to use the old EVAL method in VB.NET?
View 10 RepliesI don't know how to ask what I'm hoping to achieve, so I'll give you an example.
I have two tables in my database...
Items...
Fruit SupplierCode Price
Banana
1
2.99
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I have an assignment where Im supposed to make a compound calculator which displays interest earned each year (e.g. next 10 years) as well as the total amount for those years. Im having difficulties in writing the code for the calculation.I know the formula and how it works but Im not entirely sure how to use it in VB
View 6 Replieswell i am having a couple of issues with this particular homework problem and this is my first programming class so there is probably quite a few mistakes well the homework problem is to take three double values entered by a user and display the largest and smallest using math.max and math.min and display the smallest and largest so i thought i could use a listbox and take the values that went to the listbox and assign variables to each so i can try to use each variable in the math.max and min but im not making it to far and i actually might be way off
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So as the name states; I am a newer coder.
This is the code i have:
Public Sub RandomNumbers()
Dim s(4) As String
Dim RandomNumber As Byte
I don't know if you can tell what I am trying to do here, so I will try to explain. I what to create for random numbers and place them into for different text boxes. I also would like to do this with combo boxes and their selected indexes. So if the combo box has 10 items in it; the new selected index would be the random number generated above.