I have 2 textboxs on Form5.TextBox1 as showing a result and Textbox2 for Input the some value.When user input a value (only two decimal place) then textbox1 showing the result by calculation on form2(DataGridview) and Form4(TextBox)
1.)I try this code but the Textbox1 on Form5 show "Infinity"..Why?
2.)It possible if mouse click on DGV Row(Form2) then automatic calculation depend value what rows
[Code]....
I am new to VB2010 and writing a MDI child form to open another form as dialogbox, then pass a value back to the MDI child form, the value is successfully passed back to the MDI child form but it can't be shown on a text box [Code]
View 19 RepliesI'm trying to show a modal form below my text how can I set form position?
View 1 RepliesI am a rookie in VB and have been trying to show in form2 only the records in table2 filtered by the value of a textbox shown in form1 which is a value from table1.So far I have not been able to achieve this and I have seen so many answers to similar questions but when I try there is always something wrong.
View 2 RepliesI have written my and in a test class for vb.net and it works as follows:
A stored procedure is executed and the result is saved in an xml file with the help of a dataset. What I need to do now is , Information of this dataset should also be redirected to a textbox in a form so that I can copy this information in clipboard and create dynamic assert statements for instance I want
datatable.rows.count,
datatable.columns.count,
datatable.columns(i).ColumnName,
and same to get columnType. All of this info would be shown in the form but I am unable to open a form in NUnit test class.
I am using the Math.Exp function in a calculation, and the result essentially is Infinity / 1 + Infinity, which is 1 statistically, but it is showing as "NaN" (not a number). Is there a way to calculate/show the result of this as 1 (besides just testing for NaN and explicitly setting it as 1?) [code] X is a number larger than 709.782712893 in order to get the NaN result.
View 18 RepliesI'm writing this prgram for class, and everything seemd to be working right except for my calculate button. It doesn't show the Calculation. Here is my code:
Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculateTotalPay.Click
' declare variables
Dim hours As Double
[CODE]...
I am working on bit more advanced calculator, but I cant figure out how I can make my program to calculate textbox1.text and show the answer in textbox2
For example: (textbox1) 5*62+4
(textbox2)314
I'm not sure this question belong in this topic, but I don't know where else it should be?
I try to make one application that will first show login form (with textbox for username and password) and when I press login client application send request to server side application that make SQL query (local) and return some values and that values will be listed in main form. I try something with TCP chat source codes but I don't manage what I want.
View 3 RepliesI am getting the followin error from my code. System.InvalidCastException was unhandled Message="Unable to cast object of type 'QADBASE.DMRDataLists' to type 'QADBASE.DMRData'." Source="QADBASE" I am getting the error in the code below on the createDMRIssue
[code]...
[code] does anyone knows if there's a infinity function for this code above? like "Dim dd(0 to infinity) as integer
View 1 Repliesm trying to calculate the width of a textbox given x number of characters. So how, given a random instance of a textbox and a random number of characters, can I calculate this? little extra spacing is allowed - for example if you were basing the widthupon the greatest width of a character given the current font. Actually, this is preferable
View 4 RepliesI have to use some calculations now and then and sometimes those will give me inf, and sometimes they work, this makes my app very inaccurate...Now i dont know what is causing this, im not dividing zero so far i can see..
(3 + Math.Sqrt(5)) ^ ...
It works for single numbers, But how would i retrieve the ?double? of bigger numbers without getting INF?With bigger numbers i mean really big, like 1477014138.
Im trying to make it so that a user make a selection, with that selection is a IP address (192.168.1.) and than it gets looped and pinged from 2 till 254 strip = string and gets his value out of a case select. from mainpage (so its a public string)But i get an error that it cant get converted to a string and that it should be less than infinity.look code below.. i even tryed to make a seperate integer who adds the 2 others together (strip = 192.168.1. and intcount = 1 2 3 etc, those 2 together gives a full address)i cannot convert the strip to integer cause then it complains on the mainpage about the "cannot convert, should be less than infinity".[code]
View 2 RepliesI'm reading the highest value in my textfile and adding one to the value in my textbox, the problem is once the integer hits 100000 the program will crash, is it possible to make it infinity?[code]...
View 3 Replieshow to calculate "InvTotalTextBox" and "InvDiscountTextBox" values then show the result in "InvNetTextBox"..?
how can i do..?
three TextBoxes in a form
InvTotalTextBox, InvDiscountTextBox and InvNetTextBox
InvTotalTextBox is Binding with Table Field "InvTotal"
[Code]....
does anyone know how to calculate a textbox string to be a CRC16 value?
View 7 RepliesI am using vb express edition 2008. I need to check if an infinity (or NaN) number does exists but I don't know what my mistake is.
Dim Slop1 As Double
Slop1 = (20 - 10) / 0
If Double.IsNaN(Slop1) Then
MsgBox("Check the Coordinates")
End If
whats the diference between the 'IsNaN' and 'IsInfinity' is?
I have 16 buttons assigned a number on the form, the buttons should go from "" to "4" and back to "" again as clicked. If a button in a row, column, or region is the same it should evaluate as a bad move and provide the user with a message box indicating so. I have this working in a different program but I am now attempting to write efficient code. I must have left something out; I get an error when I click on any button stating my value must be less than infinity in my first for next loop. [Code]
View 4 RepliesCertain operations in .Net can give a double variable the values "NAN" or "1.#INF". That's great flexibility but I would rather an exception be thrown any time a double is given one of these values. In my program these values should not exist, and when it does it inevitably leads to an error down the road. I keep trying to put in checks using double.IsNAN or double.IsInfinity but certain things keep slipping by. So there is any setting in .Net to just make it always invalid for a double to be set to these values?
(Edit: also annoying that I think you have to use two checks: IsNaN and IsInfinity to catch these two possibilities. If anyone knows of one check that catches any double that is not a real numeric value it.
Is it possible to assign a pixel value of a binary file to infinity? Lets say that my binary file is composed of 4 pixels only and the values are (1, 4, 8, &)... Would it be possible to assign the fourth pixel to infinity?
View 7 RepliesI Have a datagrid with Item, Description of Item, Qty and Price.I would like on the 1st txtbox display subtotal depending on the quantity, price and add a tax textbox and the subtotal all from the datagrid to to those textboxes.
I already have all of that on my table of Products.
how do you show information from a datagrid cell to show up in a text box in another form, this is for a college project.
View 1 RepliesI am trying to calculate two columns in a DataGridView. The first column is the points column and the second column is the Rental_charge column. I would like one text box to display the total of points and the second text box to display the total Rental_charge.
Private
Sub Rental_ItemDataGridView_CellEndEdit(ByVal
sender As
Object,
[code]....
I'm using Visual Basic Express 2010. I have the prompt, the textbox and the calculate button. For the answer do I have to make a separate label for the answer in seconds and the actual response "That will take (separate label for answer) seconds" I made a click event button and assigned the following as global variables at the start of the form:
Const intSpeed As Integer = 1207
Const intTime As Integer = 3600
Then I made a click event for the button. I don't know what the formula is. Basically the user inputs a distance in the box, the calculate button tells you how long it will take for the vehicle to travel that distance in seconds.
Here's the interface: [URL]
Criteria:
Are We There Yet?
The Thrust SSC, a super fast vehicle tracked at 1207 Km per hour (750 mph) was clocked on the Black Rock desert back in 1977. Build an application that will tell people how many seconds it would take to get to their destination if they were driving the vehicle. Of course this doesn't include having to stop for stop signs, travel through school zones, or slow down for corners.
You need to include the following:
1.) Design the application with a prompt label and textbox to collect the distance from the user.
2.) A calculate time button
3.) The form must have the text property changed to read "Are we there yet?"
4.) The objects must have both the Text property and Name property changed to an appropriate value.
5.) A constant global variable should be used to represent speed of the vehicle.
6.) A constant global variable should be used for seconds (there are 3600 seconds in an hour)
8.) A local Dim variable declaration can be used within the button click to hold the distance value.
7.) Variables should be declared with the most appropriate data types.
8.) Include a "Text Changed" event to reset the time in seconds to a blank value when the user starts entering in a new distance.
9.) Comment code should be included
So I need to get a button to take the number that a user enters into a textbox, calculate the factorial from that number, and display it in another textbox. I can't seem to get this to come out right.
Here's some of the code I've been playing with.
Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
Function Factorial(ByVal txtFactorial As Decimal) As Decimal
If txtFactorial <= 1 Then
MessageBox.Show("Enter a number greater than 1")
Else
txtAnswer = Factorial(txtfactorial - 1)
End If
End Function
Now I have to just work out the code part. Can a function be under a button? I'm getting an error about that. I'm also getting an error about the txtAnswer=Factorial(txtfactorial-1) part of the code.
1.prompt a text string in 0 to 20 characters and then pass it as a input parameter to a Boolean-valued Function to check if the string is symmetric or not. Display the result.
2.The Einstein's equation E=mc2 relates three variables, E, m, and c. create four TextBoxes, two for the names of variables (E, m, c) and the other two for the values of corresponding variables. Based on the entered names and values, calculate and display the unknown variable in another TextBox.
I am trying to calculate the number of years for my calculate age event handler, however i am apparently missing a method or whatnot because im trying to calculate the age , can anyone suggest help on this. I need to subtract years to get my age but when i try the birthdate.Subtract (currentDate) method i get an error about not able to convert from LONG?
So below is what I have.
Private Sub btnCalculateAge_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculateAge.Click
Dim currentDate As Date
Dim BirthDate As Date
Dim Age As Long
[CODE]
This is the current incarnation of what I have:
'Program: Ch4E4.6
'Programmer: Jeff Pannell
'Date: October 1, 2009
'Description: This will allow for entry of a worker's name and the number of pieces completed. The program will then calculate a pay rate, but also determine an average and summarize number of pieces made, total pay and an average pay per person.
Public Class PieceworkForm
'Declaration of modular-level constants.
Const PIECE_RATEA_Decimal As Decimal = 0.5D
Const PIECE_RATEB_Decimal As Decimal = 0.55D
Const PIECE_RATEC_Decimal As Decimal = 0.6D
[Code] .....
So, my problem is that whenever the form is executed..a user would type in a worker name, and the amount of pieces made. I get a dollar amount earned and then a total pay, though they seem to be the same. More than likely I've got some sort of bad logic in there mathematically.
I'm trying to calculate the total cost for gas for a Chevy and a Buick on a form. The total miles is 21 for city and 33 for freeway. I'm also putting in the mpg for each, for city and freeway. How would I set up the labels to display the right amount? Do I use If Then statements?
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