in one textbox i have 10:00 PM and in another textbox i have 12:00 PM....i want to subtract 10:00 PM from 12:00 PM and get result ie 2 hours...how can i perform that?
DateTime.TryParse(TextBox1.Text, d1)
DateTime.TryParse(TextBox2.Text, d2)
in one textbox i have 10:00 PM and in another textbox i have 12:00 PM....i want to subtract 10:00 PM from 12:00 PM and get result ie 2 hours...how can i perform that?
DateTime.TryParse(TextBox1.Text, d1)
DateTime.TryParse(TextBox2.Text, d2)
the code is to convert the text into time.
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I wrote a VB.NET Windows Service, which works fine. I have only one issue with it. I want the service to execute on the half hour and top of the hour marks (e.g. 9:00, 9:30, 10:00, 10:30, 11:00, etc etc etc). I am using the following code:
Protected Overrides Sub OnStart(ByVal args() As String)
' Add code here to start your service. This method should set things
' in motion so your service can do its work.
[CODE]...
This code works, however, if the service starts at, say, 10:15, then it executes at 10:15, 10:45, 11:15, 11:45. How do I make it so it always executes on the 30 minute and top of the hour marks?
So let's say I have 1400, I want to convert it into 2:00PM I tried the following:Dim convertedTime As String = DateTime.ParseExact(theTime,"HHmm", Nothing)
And it would give me this: 6/12/2012 02:00:00 PM
I do not want the date part, neither do I need the seconds. All I need is 2:00PM
I am currently having a headache on how to solve this problem that i am facing. here is the situation: I have a combobox and a list box on the main form. The combobox will get the data from the ms access database. In the database, i have the details of a person's IC, Name and DOB say for eg on one entry I have D215311523C,SHAWN,13/04/1987 So now, my combobox on form load will show the list of dates in the database to allow the user to search base on the date itself by clicking on the selected date. So when the user clicks on the particular date say 13/04/1987, people in the database whose birthday is 13/04/1987 will be shown on the listbox.Meaning to say if i have 3 entries whose dates are the same 13/04/1987, 3 entries will appear. If there is only two entry, then two results will be shown. But now, when i do a single click on the date, one result will be shown. That is correct. But the problem is when i click on the same date again, three of the same results will be shown on the list box. that is it will display : 13/04/1987 13/04/1987 13/04/1987 which is not the case. Then it will show more duplicates of the same results if i click more times on the same date which should not be the case.
Dim n As Integer
Dim numbers() As Integer
Dim StartFrom As Integer
Dim EndAt As Integer
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I am using a datagrid in my where i am having four columns. In first column the parameter values are entered and in the second column measured value is entered and in third column the nominal value is entered.Inthe fourth column the result is displayed by subtracting the measured value and nominal values. I am doing this calculation in Datagrid cell validated event. What i want is,there will be many rows in the grid,when typing the value in the third column the corresponding result will be displayedin the rowof theresult column,save button will be displayed while the form loads,when the calculate part is completed that is there should not any cell of the resut column empty then i should enable the save butto.
View 2 RepliesI am encountering the following issue So i have a device that sends stuff at the serial port, i then parse it and put it into an array of bytes like that:
Dim HCI_Command_Rcvd_Byte() As Byte All good till here What i wanna do is make an array and put this result every time the serial port gives me a new result, for example:
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Basically what i wanna do is let the port parse the messages, fill in the array with the result at an empty spot in this array and then i will have a separate thread that will look in into this array in each non empty space and after it looks into the non empty space it will use or discard the info and also mark this space as empty (after it checked)
I'm doing this program in Visual Basic and its supposed to calculate the GPA by entering the completed courses in a listbox. Its does calculate the GPA as its supposed to by adding the values using a "Add to list" button, but i have to also update the value of the GPA if a remove an item from the listbox using a "Remove from List" button. Is there a way a remove the line and also make the subtraction work.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddtoList.Click
'This is the Add button
course = txtCourseName.Text
[code]....
I just read about DataSet in VB.NET, it uses disconnected concept. My question is: if my apps has "List All" button that query data from 1 table in the database, and that table has "very very very" many rows, so my DataSet will be filled with those data and eat up memory. Can I limit the data that being put to the DataSet from that query? But I want to be able to retrieve the next data from the same query if the user want to see it?
For example:
I have 1000 rows in my database, and i query all of them. But I just want 200 rows being inserted to my DataSet, but if the user want to see rows number 201 and so on, I want to be able to retrieve the next 200 rows, and so on. So it just like cutting those data into a group of 200 rows. Can I do this with the concept of "disconnected" of the DataSet?
As part of a school assignment I have to design a program that allows people to add items to there backpacks but only upto a certain limit depending on age height etc. I completed the code to work out each packs maximum weight and thought I had almost finished but... Now I am trying to use a list box to add up the total weight of items added to each pack (below) but rather than add up I am just assigning the value 5 to the pack1weight.
Code:
Dim pack1weight As Integer
Dim tentW As Single
Dim maxweight1 As Single
[code]....
Im new to vb.net but learnt quiet abit, im using a book and getting to the stage where it gets confusing, anybody know of any videos or a better way to learn? first of all I have connected to a database but i want to beable to get the servername, username and password from a registry file instead of putting it directly into the code,
Also in the database I can add and update records etc... how would I make it take the current value in the table and add / subtract to it then update? eg. in the table i have 60, i want to add 10 to the value so 60 + 10 = 70 update record with 70. etc.
I would like to subtract a month using vb6.. Which function to use??
View 3 RepliesI wonder how I can subtract cells in VBA? I want to use an For-loop that subtract column "B" with column "C". I want it to take all the values in kolumn "B" minus ( - ) all values in column "C" in the whole range.
View 12 RepliesI'm stuck on writing a query to subtract "Amount to pay" with "amount paid", my assignment sheet says to 'use two queries and subtract in vb'. but i still don't really understand it
What the program is supposed to do is:
1. the user types in a specific customer id
2. the button "What is owed by the Customer ID?" runs the query
3. the query returns and opens a HTML with the customer id, the amount to pay, the amount paid and the total amount.so far what i've come up with is:
sSql = "SELECT CustID, SUM(AmountToPay) As AmountOwing, SUM(AmountPaid) As PaidOff FROM Order, Payment WHERE Order.CustID = Payment.CustID AND CustID = " & sSearchValueA & "GROUP BY CustID;"
I have 15 ofTextBoxs.1 to 5 is TextBoxs have a fix value and 6 to 10 is TextBoxs where the user
can input some value ,finally the textboxs 11 to 15 as a result What i want to do is when user input the value in textboxes(6) then the result automatically raise in textboxes(11).Then when put value in textboxes(7) then result automatically in textboxes(12) and also..
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I'm looking to design a calculator that adds and subtracts binary numbers. I'm new to this program and stumbling on where to start?
View 6 RepliesCan someone show me an example of how to add or subtract when you have the button value going into the textbox like this[code]...
View 4 RepliesI have built a small VB.NET Calculator but whenever I add, subtract or multiply by 0 the answer is always 0. Here is my code:
Spoiler
Option Explicit On
Public Class Calculator2
[Code]....
In excel macro i got this two variables:
TimeF_1h = Cells(x, 3) - 0.041667
TimeF_12h = Cells(x, 3) - 0.5
i tried to do the same in Vb.net, but something is wrong i assume i should do it other way.
TimeF_1h = .Cells(x, 3).Value - 0.041667
TimeF_12h = .Cells(x, 3).Value - 0.5
I don't know what does it mean:
0.041667 and 0.5
in excel column are dates in this format:
2011-03-07 16:35:23
can i do this in VB.NEt example i wanna subtract the difference from 8:00 AM TO 12:00 pm how can i do this what namespace do i need? how can i add time? how can i add two dates
View 3 RepliesI'm Currently working with a payroll system with daily time record.. I'm having troubles with their time records, what i did is this, i created 6 textboxes on the form the 1st textbox is for the AM IN 2nd is for the Lunch OUT the 3rd Is for the total hours worked for the half day, and the same for the 4th to 6th textboxes. I actually get the difference of 2nd and 1st textboxes and show the result at 3rd textbox and same for the 4th-6th textboxes using this code that I also get in this site
Dim TimeA As Date
Dim TimeB As Date
Dim hh As Integer
[Code].....
but i really didn't understand it so right now I don't know how to add the value of textbox3 and textbox6 so I could get the total hours worked of the employee..
I'm writing a program that checks something once a day. When the property has been checked, I store the "Now" value as LastCheckedDate. Since this is a dateandtime, in includes both the value of the date and the value of the time. The next time the program is run, I want to determine if the current value of Now has a different date than the LastCheckedDate. The problem is that functions like Datedif subtract the two values using the times, so if the first check was at 16:30 on 11/2/2011 and the second check was at 9:05 on 11/3/2011, the result is about 16 hours, which is 0 days.
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I have two datetimepicker controls one as a start date the other as end date, How do I go about subtracting the values to ge the number of hours? I tried...
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I have some problem with my project.
1) I want to convert String (ex : "14/03/1987",...) to system datetime
2) I want this function : Subtract(date1,date2)
==> result: if subtract(date1, date2) > "1 month" then ......do something else if .........do something
I have some problem with my project.1) I want to convert String (ex : "14/03/1987",...) to system datetime2) I want this function : Subtract(date1,date2) ==> result: if subtract(date1, date2) > "1 month" then ......do something else if .........do something
View 5 RepliesMy question title says all. Suppose the given date is 7th july 2011. So what I want to get in result is 6th July 2011. And leap years aren't to be counted. The day number always should be one less than today. I did this:Dim year As Date = "1/15/2009"''adds 1 years to current dateMessageBox.Show(year.AddYears(1))
View 5 RepliesI'm completely new to programming and wondered if you could help me. I've designed a simple calculator that can add numbers together but am now trying to create a subtraction button. This seems more complicated, I've searched various forums but am a little confused and wondered if any of you can help or point me in the right direction. Here is the coding I've done for the Add button (cmdPlus):
Private Sub cmdPlus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdPlus.Click
[Code]...
How do I subtract a month from a date object in VB.NET?
View 4 Repliesif the subtracted date is a saturday or sunday then subtract more days, before adding to arraylist..when i do this, the date stays the same and doesnt subtract, i get a conversion string to double error.[code]
View 2 RepliesI am stumpted when it comes to getting the current system hour.
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