i'm just a begginer in using visual basic. i'm trying to add, subtract, multiply and divide two numbers. here is my code;[code]an error is occuring when i'm not putting any number on the textbox. now for the problem when i put a number to textbox1, and 0 to textbox2, there is also an error. It's because we can't divide a number to zero.
View 12 RepliesWhen trying to divide the following, I get an overflow error:SAA_EM_DM(i, 1) = SAA(i, 1) / SAA_EQ_FI(i, 1)
All arrays are defined as Double
I have 7 company Divisions that sit in an access database.I then use this list to populate two comboboxes in my windows form.However I get a syntax error in my SQL Query if the Division name is more than one word.For example in my access database I have two columns one is a status column and the other is a division column. If for example the Division is called 'Corporate' the status column is called 'Status Corporate' and the division column is called 'Corporate'.The SQL query works fine in this scenario.However if I have a Division that is more than one word, lets say 'Operations Division' I get an error in my SQL Query that says -
Quote: Syntax error (missing operator) in query expression 'Operations Division'.Here is my code
sqlNewTenderDetails = "SELECT " & Me.DivisionBox.SelectedValue & " From BidRefCodes Where " & "[Status " & Me.DivisionBox.SelectedValue & "='Active'"
daNewTenderDetails = New OleDb.OleDbDataAdapter(sqlNewTenderDetails, NewTenderDetailsTableCon)[code]....
Its basically to compare the textbox is not blank
if not Convert.ToString(txtbox1.Text)=String.Empty then
or
if txtbox1.Text.Trim.Len>0 then
read code below as soon as user lefts field blank he should get the mesage thats what i am creating but ofcorse this code creates a bug and i get that message once for first textbox then for second and this process continues till i stop the project app gets stucked between thease two textboxes?
Private
Sub fname_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles fname.LostFocus
If fname.Text = "" Then
[code]....
I'm trying to make a notepad, but I can not get it to open files on start up.what i mean, example, I right click on a text file on my desktop and select open with and then my program(it opens the program with a blank textbox, it does not open the text file)I do not know the code for makin this come true
View 4 RepliesIs there any way to remove the spaces at the end of text after it has been pulled out of an SQL Database. Ive tried timming but ive had no luck.
View 6 RepliesI have this code that is supposed to validate that the value a user enters into the textbox is a number and not blank, but it is displaying the error message even if the user enters a number.
Private Sub txtAnswer_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtAnswer.TextChanged
If Not IsNumeric(txtAnswer.Text) And (txtAnswer.Text <> " ") Then
MsgBox("Please enter a number! Try Again!")
txtAnswer.Focus()
Exit Sub
End If
End Sub
I just realized I already have another section that checks if the textbox is left blank, but I still need to check that it is numeric.
how do i set my initial value for textbox as blank. I tried to I load my textbox a data coming from my database but what my problem is that I need to set my default value for textbox as blank because everytime I load the forms the textbox will be filled immediately with data. This is how I bind my textbox and combobox after loading from database.
cbxJoblvl.DataSource = myDataSet.DefaultViewManager;
cbxJoblvl.DisplayMember = "Joblevel.lvl";
cbxJoblvl.SelectedIndex = -1;
txtLvlName.DataBindings.Add("Text", myDataSet.DefaultViewManager, "Joblevel.lvlname");
I have a textbox and a copy button, when I publish the app and run it, it returns an error if there is nothing in the textbox. I know why its giving me the error, but is there a way to suppress the error? Make it copy nothing? I want to make my co-workers and my lifes a little easier.
Current Copy
Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
Clipboard.SetText(TextBox5.Text)
End Sub
I'm using the ErrorProvider in VB.Net (2005) which is associated with a BindingSource that is bound to a custom object that I have created. This custom object contains a date field that has a "Date" data type that. I am using a "TextBox" to bind the date field in my form. My issue is, whenever the TextBox loses focus and is blank, "String not recognized as a valid DateTime" is displayed by the ErrorProvider and the focus can't be changed to any other control on the Form. It's good that the ErrorProvider validates entries on Date fields by default (I didn't set up my custom object to display this particular error for the date), but it should allow blank values. I want the user to be able to have a blank date with no error message displayed. How can this be done using a Date field bound to a TextBox?
View 2 RepliesI have a date field bound to a textbox. If I make any changes to the textbox, I get "stuck" in the field unless I put a valid date value. All I want to do is set the date textbox to blank and move on to the next field, but I can't. I am eternally "stuck" in the field unless I put a valid date value.
[url]..
I did several hours of research, but looks like there is really no solution to this problem... Is this true?
I am trying to convert a VB6 app to vb.net. It used msInet.ocx and I am using FtpWebRequest to replace it.I have a problem when the password is blank and then remote server throws a 500 error.WebException was handled The remote server returned an error: (500) Syntax error, command unrecognized.
Const localFile As String = "C: eststat.txt"
Const remoteFile As String = "/stat"
Const host As String = "ftp://myprinter"
[code]....
I'm doing a simple calculator program calculating Pennies, Nickels, Dimes and Quarters. I made a Try-Catch statement so that if the user enters letters into the text boxes, they get an error message. However, if the user leaves one field blank, the error message still pops up. What's the code so that I can get Visual Basic to recognize that an empty field is the same as 0 so that that message doesn't pop up? [Code]. What do I need to add to it to get that Error Message to stop showing when the user doesn't enter a value into one of the text boxes?
View 7 Repliesi've been all over the internet to solve this problem, but i've found no solution to my problem.my concept is this.Based on selected value within a combo box, the datagridview will populate with values from the database.
[Code]...
How to apply textbox blank validation on button click inside gridview in javascript?I have a gridview that contains 2 textboxes and a save button in each row.I want to validate the textboxes on corresponding save button click.
[Code]...
I am a VB programmer. Recently I noticed that my visual studio is not breaking or alerting me on runtime errors such as "file not found", "division by zero", "database connection error" etc. I want the error display and breaking on..
View 3 RepliesIm trying to make the below statement as such if there is no items selected/blank then the search term is a wild card (all results) otherwise search it. the sql below only works when all fields match, not partial
[code]...
1.In a bank fixed deposit rates are given below.
PeriodRate
6 months8%
12 months10%
24 months12%
a.Design Suitable user interface in windows application in VB.NET to calculate interest at maturity. Use Radio buttons for period.
b.Calculate interest at maturity.
c.Calculate total amount at maturity
d.Add a clear button to clear the exiting contents
e.Display an error message when deposited amount is blank
I'm trying to updatesome records, currently my table is blank apart from the user id which is correct. but i get the error below.
My UserSettings table is as follows
ID is a Integer
MonthID is a Integer
YearID is a Integer
UserName is a string
Balance is a Integer
PhotoAddress is a string
GameSpeed is a Integer
This is my code and below that is my error in my ErrorTXT box.
[CODE]...........................
What's the difference between / and for division in vb.net? My code gives very different answers depending on which I use. I've seen both before, but never knew the difference.
View 3 RepliesI am using oledbconnection object with access database engine 64 bit to get data from Excel file. While using sqlconnection object if sql string has these statements "SET ARITHABORT OFF;SET ANSI_WARNINGS OFF;" , then division by zero exception doesn't cause any problem. But while using oledbconnection these statements cause error. My code samples are below:
Dim PbpConn As OleDbConnection = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;" & _
"Data Source=C:BuzBeatDataPBPData.xls" & ";" & _
[Code]....
When SUM(pbA) has value "0" then it causes error and can't get data. is there a way to close the warnings and division by zero exceptions?
i face a problem while i practice the question in my text book, it require us to key in 4 digit of number and split it into 4 digit and encrypt it. Below is my coding [code] Console.WriteLine("The encrypted number is: " & encrypNumber3 & encrypNumber2 & encrypNumber1 & encrypNumber4)But its got error after i key in the 4 number.
View 2 RepliesI've got a problem approximating the result of a division that should give a sharp result:
I use this code:
pListPrice *= 100 / (100 + VATPercentage)
where VATPercentage = 20D is declared as Decimal type. pListPrice = 25.2D is declared Decimal too.
The result should be: 21.00 sharp!
Instead I get 20.99999999999999999999D
I have a group of 25 labels named Label1, Label2, Label3, ... Label25 in a square of 5 per row, 5 per column and I wanted to assign the backcolor to all of them on a loop and assign a value of "True" or "False" to a matrix of 25 boolean values representing them.
But I was getting errors on the pattern created.
My approach was to use a substring containing a number copied from the label names:
Num = Val(sender.name.substring(5))
And the subindexes of the matrix:
p = (Num - 1) / 5
q = (Num - 1) Mod 5
The values for the lower corner of the matrix were rouded to 5 instead of being 4. Instead of (4,0) ,(4,1), (4,2), (4,3) (4,4) I was getting (5,0),(5,1)...(5,5)
So I solved the problem by creating two single variables "A" and "B", doing the divission and MOD operations on them, finding the floor of them and then converting to integer:
Private Sub Label1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles _
Label1.Click, Label2.Click, Label3.Click, Label4.Click, Label5.Click, _
[Code]......
Deviding an int by zero, will throw an exception, but a float won't - at least in Java. Why a float have an additional NaN info, while int haven't?
View 6 Repliesi have got a value in time span lets say: tsp1= 2 hour 5 minuts i have a another time span variable which contains value like: tsp2= 0 hours , 2 minuts?how can i divide tsp1 by tsp2 so than i can get exact number of times tsp2 divied the tsp1 and how much value is remaining.i am using vs2008?
View 3 RepliesIn the following linq query I have a division by zero exception wich I can't seem to code around. It occurs when the Sum of fldDevider returns 0.[code]...
How can I Make sure the ValuePerMonth field is 0 when the Group.Sum(Function(dr) CDec(dr.Field(Of String)(fldDevider))) function returns a 0. Or how do I return a 1 for Sum fldDevider if it is actually 0.
I have hit a block and not sure the best way to go with this. Looking for resources to find more on the subject
View 1 RepliesThis exercise says :"Write a program that inputs one number consisting of five digits from the user, separates the number into its individual digits and prints the digits separated from one another by three spaces each. For example, if the user types the number 42339, the program should print
4 2 3 3 9 Use the command window for input and output. [Hint: This exercise is possible with the techniques discussed in this chapter. You will need to use both division and modulous operations go "pick off" each digit.]"
Here is what I have learned in Chapter 3:
�If/Then Statements
�Console.Write()
�Console.WriteLine()
[Code]....
This exercise I have yet to start, and don't think I will be able to do much, because I have no clue how to "Pick off" the numbers using division and modulous operators. I know what the mod operator does, but I do not know how to use it and division to do what this exercise is asking me to do.