I'm trying to subtract 2 dates.: currentdate and a maxDate value that I have. If the difference between the 2 dates is 180 days then I want a messagebox to show up. Here's the code I have so far. Everything works except for the "currentDate - maxDate > 180" part. I get an error on that part.
Dim maxDate As DateTime = "1/1/1900"
Dim x As Integer = 0
Dim currentDate As DateTime = DateTime.Now
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I have a DateTime Picker that I have set Format to "Custom" and CustomFormat to "dd/MM/yyyy HH:mm"
When the user changes the date time it all works fine and update the table no problem.
If the user does not change the date time I get the error[code]...
I must convert string data from a CNC that is arithmetic expression to a number that I can use in a VB application that I wrote. The following is what I get out of the cnc. [18722*65536+19377]/67108864. I need to evaluate this expression in my VB ap. The format of the string is not always the same as what I have illustrated.
View 2 RepliesI have a combo box and a datetime picker on a form that I do not want a user to be able to type in or select. I need both controls to look as if they are enabled with the default backcolor and black font color. How can I do this?
View 4 Replieshow to convert string to datetime and calculate date
View 3 RepliesI'm trying to match a certain DateTime value with the current system DateTime. I have a timer and a label on a form. Timer interval is set to 1000. When the form loads, the timer starts ticking. As soon as the current DateTime matches the value of the variable, it shows a message in the label. When I'm writing the following code, the values don't match even if the current system DateTime is equal to the variable. Label1 isn't showing 'Times Matched':[code]The default format of 'Now' is the same as I have stored in dtmVar variable. So there's no question of format mismatch. Does that mean 'Now' is not actually a DateTime property? Provided, my O.S. is Windows Vista Ultimate and all date/time settings are set to default.
View 1 RepliesI'm trying to match a certain DateTime value with the current system DateTime. I have a timer and a label on a form. Timer interval is set to 1000. When the form loads, the timer starts ticking. As soon as the current DateTime matches the value of the variable, it shows a message in the label.
When I'm writing the following code, the values don't match even if the current system DateTime is equal to the variable. Label1 isn't showing 'Times Matched':
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim dtmNow As DateTime
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Why is it so? The default format of 'Now' is the same as I have stored in dtmVar variable. So there's no question of format mismatch. Does that mean 'Now' is not actually a DateTime property? Provided, my O.S. is Windows Vista Ultimate and all date/time settings are set to default.
datetime1 and datetime2now two fields are have data ( date )in table recordi want to update only datetime2 is an emptyi am using visual basic 2010 ( visual studio 2010
View 1 RepliesI try to compare Datetime.Now with a Datetime variable I set, using the Datetime.CompareTo() method. I use a timer to compare these every second and display the result, but as the current time approaches the time I set, the result changes from 1 to -1, but never 0, which means these two are never equal. I'm suspecting the Datetime structure contains milliseconds?
View 7 RepliesAssume the following program is started at 1:59:01 AM on 3/13/2011 in the United States. The first time Timer1 ticks what will be the value of the TimeSpan (ts)?
Public Class Form1
Private Sub Timer1_Tick(sender As System.Object, _
e As System.EventArgs) Handles Timer1.Tick
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I'm trying to add the date and time of Today into a Sql-database-field that has the datetype datetime.
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the msgbox gives me the following result: 29/01/2011 18:49:21 my sqlException gives me the following error: 102 - Incorrect syntax near '18'. Is it better that i set the datatype to char in my sql database? It's maybe a bit easier? When I do that, can I calculate with these date?
Dim query as String = "Select * from openquery (devbook, 'SELECT wb.arrival_time FROM web_bookings wb ')"All I need is to convert my arrival_time into a datetime field in the query
View 1 RepliesI've never seen this error before; and apparently (According to DIC) the number would have be bigger than -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807, to this this exception (I'm using an Integer, but I've tried Int64, and the same thing happens).
This is where the exception is being thrown:
Dim localPort As Integer = (tcpRow__1.localPort1 << 8) + (tcpRow__1.localPort2) + (tcpRow__1.localPort3 << 24) + (tcpRow__1.localPort4 << 16)
Full Code (Method)
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I highly doubt that that the integer that is being parsed back is greater than, either of those numbers listed above. I've tried using Int64, and even removing the << operator, but it's still throwing this exception.
I want to place the arithmetic operators in an array so I can randomly select one at a time. I am not sure how to declare and initialize them so that I can use them in an equation.
View 11 RepliesI am creating a final grade calculator for my Visual Basic Class...It takes 4 grade text box entries, adds them together and then divides by 4 to get the average grade...The average grade result needs to display one number past the decimal. (Ex: 89.2) I cant seem to be able to get the average grade result to display the 1 digit to the right of the decimal...
Private Sub Calculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Calculate.Click
' This event handler is executed when the user clicks the
' Calculate button. It calculates and displays the average
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I am in the process in implementing a Customer Billing Tracking System in VB.Net 2008 and using SQL Server 2005 as the database.How ever there are a few calculations and formulas i have to write (of coz, since it is a customer billing tracking system...)
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I am using a DataReader to get data from a database. For some reason, I keep getting this error "Arithmetic operation resulted in an overflow." The error occurs on the line: courseID = (dr.Item("courseId"))
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Ok so in my code i need a ****ing long as equation to draw a certain paint for getting the distance of a particle using the terminal velocity equation. which looks like this...
var.vt = ((2 * var.m * var.g) / ((var.fluiddensityp) * var.apaos * var.dragcoef)) ^ (1 / 2)
then pop that in here to get terminal velocity at a given time...
= var.xvalgraph1 * ((var.g * var.fluiddensityp * var.dragcoef * apaos) / (2 * var.m)) ^ (1 / 2)
terminalvelocityovertime = vt * Tanh(tanhx)
then as I'm drawing a graph i calculate the previous coordinate and join then with a line.so i need a value called previous which is where ever there is a var.xvalgraph1 it minuses what ever time increments have been set so alll var.xvalgraph1 turn to (var.xvalgraph1 - var.timeperpixel)
ok thats all fine this is where the equations get too much and i don't work
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Why a variable defined as a long will not accept this number (2,148,532,224) with out throwing an exception of "Arithmetic operation resulted in an overflow." Looking at documentation it should be able to handle a value up to 9,223,372,036,854,775,807.
My code does some simple calculations and then tries to store the value in the variable.
Dim mdblTotalFileSize as Long = GetImageSizeBlocks * GetBlockSize
The value for GetImageSizeBlocks is 1049088 and the value of GetBlockSize is 2048 which equals 2148532224
Whats the best way to include the Currency Symbol, without affecting arithmetic operations for example. Lets say I have a Listview which has one column named "Cost" where ill be a Currency Value which needs to carry the symbol for example "BsF. 22,34" or "$. 22,34". Lets say I need to apply aritmetics with those values after whats the best way to store em or at least ignore the symbol when using arithmetic on them?
View 3 RepliesHow do you use money in visual basic I know that I have to set nickels and divide by 5 and I am suppose to have another expression to the number. Then i am suppose to determine what change i would have left so that way i can determine how many pennies I have.[code]
View 1 RepliesI am building an equation parser, it takes the equation
"( 3456 + 321 * X ) / 45"
For example. As I couldn't find a direct solution to parse this equation, I split the equation and started implementing the operations 1 by 1 until I stuck with the execution order of the arithmetic operators (as the multiplication should be performed before the addition). So I am trying now to avoid this and try to parse the full equation. Is there a way to convert the string "+" to + for example?
I get a "Runtime Error 6: Overflow" when I multiply some variables in VB6
View 4 RepliesI have some software written in VB.NET that performs a lot of calculations, mostly extracting jpegs to bitmaps and computing calculations on the pixels like convolutions and matrix multiplication. Different computers are giving me different results despite having identical inputs. What might be the reason? I can't provide the algorithm because it's proprietary but I can provide all the relevant operations: [code]Is it possible that OrderBy is using a non-stable QuickSort and that QuickSort is using a random pivot?
View 3 Repliesi am reviewing variabes, and just wondering any variables that can be used in math to hold a value this big =)
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I'm stumped with something I thought I had been doing fine for months now. I get the error, "conversion from string '''' to type 'Double' is not valid."I've also tried to Dim the variables within the private subs with different names and whatnot. I've commented out the TextBox10 and have decided that the error has something to do with me reassigning the textbox value to a variable.
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I am new to programming with visual basic version 10 (I hope this is the correct forum).
I am using the following line in my program[code]...
I am getting the message that an arithmetic operation resulting in a math overflow.
I need to write software that will do a lot of math. Mostly it will be matrix multiplication with integers to compute DCT. How much faster should I expect the code to run in native c as compared to VB .Net? Factor of 2, factor of 10, factor of 1000...?
View 3 RepliesLets say i have three buttons[cod]e...
how do i write my code under button3 that my result will output 27 on the textbox
A recent assignment asked me to write a program to print a business expense report. The example form showed both a print and a print preview button so I assumed that meant not to show my output in a listbox. The problem that I had is I kind of ran into a catch 22 situation. If I declare some of the variables as strings, then I can't get the program to perform the addition arithmetic, it wants to only concatenate. If I declare them as integers or double then I can't get them to be recognized by the Drawstring command. The strange thing, to me as a beginner anyways, is that it did perform the arithmetic on a variable (meals) that I declared as a string initially. It multiplied it by 50% as I requested. If it wasn't for the concatenation, this would have worked perfectly according to the assignment.
The code is below:
Public Class frmBusiness
Const One_Inch As Integer = 100
Const line_height As Integer = 25
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