Public Class Final2
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code].....
there's a logic error in this code. it accepts negative value but output positive one. just wonder if Math.Abs functions here.
On Form Level, I use following codes to make textboxes to accept only numbers,How to add these codes in main module, instead of of writing these codes on every form.
If TypeName(Me.ActiveControl) = "TextBox" Then
With Me.ActiveControl
If Not IsNumeric(.Text) And .Text <> vbNullString Then
[code]...
How do I validate textboxes so that they accept only numerical input (1 2 3 etc and not abc @$ etc)? Is there some kind of property of the textbox that I have to change?
View 1 RepliesI'm having trouble with the Try...Catch code. I'm trying to make the textboxes only accept letters A, B, C, or D as answers from the user. I'm also having trouble matching the two arrays. I wanted it to be like if textbox1 is A then it is correct but in a loop. Please take a look at my code.
This is the programming challenge instruction for reference: The local Registry of Motor Vehicles office has asked you to create an application that grades the written portion of the driver's license exam. The exam has 20 multiple choice questions. Here are the correct answers to the questions:
[Code]...
One to accept only file word and pdf file and the other to accept only images(.jg|.bmp|.png|.gif)
View 1 RepliesOn my form, i've got some textboxes and some richtextboxes. I'm using the following code, to search through the text properties of each of the two types of control. see below:-
For Each ctl As Control In Me.Controls
If ctl.Text = "7777" Then
ctl.Text = "found the sevens"
End If
Next
What i'd like to do is isolate the textboxes only, is there a way to do that? I tried this but i got an error:-
For Each box As TextBox In Me.Controls
If box.Text = "7777" Then
box.Text = "Found"
End If
Next
My goal is to, Pull information from a websight's textboxes in IE into my program textboxes. and to later Put changes from into other values on the websight from my program into it. The sight has multiple textboxes, on different frames. within it.I need to keep it as a exsiting open browser instead of making a new one. only gotten as far as finding the open internet explorer window, by useing
[Code]...
In C# we can declare a decimal number as negative zero i.e usingDecimal x = -0.0M we can define a variable x which holds value i.e negative zero. +ve zero can be differentiated from -ve zero using Decimal.GetBits method and looking at its MSB
View 4 RepliesI have an SQL Query that looks like this [code]I get two results. The first is the correct one which is -0.0060 and the second @return_value which is 0.This is also the case when I call the stored procedure from my code, I get a 0 back instead of the -0.0060 that I want. This is how I am calling the stored procedure from my code:[code]
View 3 RepliesI'm doing some math with the Timespans in .Net, and occasionally the sum results in a negative Timespan. When I display the result I am having trouble formatting it to include the negative indicator.
Dim ts as New Timespan(-10,0,0)
ts.ToString()
This will display "-10:00:00", which is good but I don't want to show the seconds so tried this.
ts.ToString("hh:mm")
This returns "10:00" and has dropped the "-" from the front which is the crux of the issue. My current solution is this:
If(ts < TimeSpan.Zero, "-", "") & ts.ToString("hh:mm")
but I was hoping to accomplish the same by using only the format string.
My program im working on does grayscale, builds an alpha mask, and splits the color channels.How do you invert a picture? the above are done looking at the image pixel by pixel.
Im using vb2005.net, for the sake of speed is there other ways of doing those things using drawing.graphics?
Quick Basic alllowed the use of negative array index's (ex. Dim points(-8000 to 8000). I am trying to convert this QB program to VB but it won't allow negative array index's. How can I create a negative index array in my VB code?
View 12 Repliesi have a negative number and i want to change it to its positive
eg -14 to 14
I am using delta plc. i want to send +1 to +30 & -1 to -30 numbers in 4 byte hex format(xxxx) in vb.net.
View 4 RepliesWhat do I use for the format number function to show a - for negative numbers instead of ()?
View 2 RepliesI have a function that allows a user to enter numeric vallues and also a period for the decimal points but I also want to allow for users to enter the minus sign to allow users to enter negative values . How would I go about it.
Public Function SingleDecimal(ByVal sender As System.Object, ByVal eChar As Char) As Boolean
Dim chkstr As String = "0123456789."
[code]....
I have my VB.NET exam tomorrow and I have a list of potential questions, and there is this one question I really fail to find a good explanation for. it gives me this function:
Dim x, y as Single
y=2
y=x+10
MsgBox(x)
it returns 0... and I am supposed to explain what that happened. I have tried changing the numbers so it gives a positive number, and then it works properly... I have tried changing the type too, and still 0.
I have a Form with 4 Textboxes. The Textboxes are multiline. To write the contents of the 4 textboxes, I did the following.
[Code]...
How do I read to or populate the Textboxes using StreamReader or StringReader or other means?
I need to check a value and make sure that it is not a negative number using a try catch statement I keep getting an error saying that I have to use a method.
Try
TotalCurrentBalance < 0
Catch ex As Exception
End Try
I wouldn't put a if statement would I? I am thinking that would defeat the purpose.
I need to convert a negative integer to a positive one.
View 14 RepliesIs there a built-in function in .NET (VB) to convert a negative number into a positive, and vice-versa?I usually end up just using:NegNum = PosNu - (PosNum * 2)PosNum = NegNum- (NegNum * 2)
View 6 RepliesI'm having problem in my datagridview.I'm using vb 2008 and an access database. When I create a new record for my item the No column (primary key and autonumber in access) always shows a negative number.How can I make that a positive number and it should follow the numbering in the datagridview.
View 3 RepliesWhy when I add new item in my database table it will show negative increment?
how can i change it to positive increment or use only integer increment.
I have written a code that when the click the calculation the button a inputbox pop up and you enter in the income and then you enter in the expense. [code]...
View 11 Repliesi have finished my code and the program works but i need setup a few error messages incase a user inputs invalid data (non numeric, and negative numbers)i keep getting both errors at the same time when i input a negative or non numeric data. My program allows a user to calculate cell phone bill
[Code]...
Similar in concept to Math.Abs() - I'm looking for a function that when given a positive integer will return the same integer. If given a negative, will return zero.
So:
f(3) = 3
f(0) = 0
f(-3) = 0
Yes, this is simple enough to write on my own but I'm wondering if the .NET Math class already has this built in or if the same can be achieved by cleverly chaining a few Math.* calls?
My question here is, what are the negative effects of using a generic function such as this? Calling this function does work, and in a test console module, it compiles perfectly fine. I do know this is not a strongly typed function, and is %100 bad practice. But it works perfectly. The purpose of a function like this, would be to handle string input that needs to be inserted in a particular format depending on the type. I also read some other questions on this here on stackoverflow, and suggestions pointed to using (Of T) functions, and variations like that. Why not do it this way? or is there another simple way of accomplishing this without creating a whole nothing class or larger amounts of code.[code]
View 1 RepliesI am looking for a way to test an integer value to see if it is positive or negative so I can perform the required actions.
View 1 RepliesI have this
[Code]...
All that is happening above is two players are being compared by scores and a winner is then decided. The calculation works fine and places the winner in the correct spot (txtWinner1.Text) as long as the numbers are positive. So if txtU1D.Text has 13 and txtU2D.Text has 14...txtU2 is the winner. Works with no problems. However, if txtU1 has -1 and txtU2 has -2...it says txtU2 is the winner. The negative scores are common in the game being played so the situation often happens, but may be one player only. It seems to work if one is positive and one is negative, but if both are negative it thinks the higher negative number is the winner for some reason. So it will give the win to someone who has -9 over someone who is -4.
I asked a question earlier about comparing numbers using the "And" comparison operator in If Statements and now I have been toying around with getting my head wrapped around bitwise operators. So I have written a very basic code that will allow me to see the conversion of any decimal number in binary format.[code]Notice here that I am using SByte as the paramerter - which should only contain 8 bits right? However, the message box that appears has 16 bits assigned to negative numbers.
View 1 Replies