My console errors out when I enter anything other than a number or operators in the designated (input). I stink at this stuff but I have been t this for about 8 hrs. still not there. I have included a text file for the task at hand
[Code]...
how do I handle the errors that may appear from the user of my program. For example, I have an triangle area program in wich I ask the user of the program to insert the length of the base and height of the triangle in a textbox. But what if he inserts a letter or something else, like a sign....my program will crash...
I know that one method would be to use On Error GoTo but I don't know how. If maybe you can direct me to some link or you could explain how do I handle errors, I would be grateful. Maybe you can even show me other ways to avoid errors from the user input.
This is my small program so far:
Private Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
Handles Button1.Click
Dim , Height, ARIA As Integer
[Code]....
I am working on a program where a user either enters "small" or "large" and then the number of toppings. Once the user has done that my program outputs the total cost of a pizza based on user input. If they enter something else besides a number in the txtNumberOfToppings I am trying to show they message box that says "Re-Enter a valid number!" Likewise I am trying to display the error message "Re-enter a number that is 0 or greater!" If they enter a negative number into the textbox. However they do not display when I do enter invalid input.
My Code
Author: Adam Fandre
Description: User enters the words "SMALL" or "LARGE" and then the number of toppings
And program then displays cost based on user input.
Comments: Finished
Option Explicit On
Option Strict On
[Code] .....
(If a letter is entered it need the program to show in the text box invalid entry)
View 2 RepliesI'm using WMI code and VB 2008 to see NIC status. So far the queries are working, but the methods aren't. For example, I'm trying to set a network card to use DHCP, I get invalid function with this code:
Dim classInstance As New ManagementObject("rootCIMV2", "Win32_NetworkAdapterConfiguration.Index='7'", Nothing)
Dim outParams As ManagementBaseObject = classInstance.InvokeMethod("EnableDHCP", Nothing, Nothing)
I'm getting Invalid column name 'CHARLES'. Invalid column name 'CHARLYN'. Invalid column name 'SMITH'.what's wrong with my code, it's been a long time since I used SQL dataset. I'm into LINQ but I'm having problems with this kind of LINQ query so I'm reverting to SQL dataset.here's my code:
'Set up a data set command object.
Dim sSelectColumn As String = ("SELECT * FROM tblScanned WHERE LastName=" & sLastName & " AND FirstName =" & sFirstName & " AND MiddleName =" & sMiddleName)[code].....
How can i check whether the text box is numeric or not? Because i want to do validation. but i tried many style still cannot work.
View 6 Replieswhere I was encrypting the string and passing it to another web page to decrypt and get the ids to be displayed as a pdf back to the page. I kept getting an invalid "Invalid length for a Base-64 char array". It was then I realised that the string was getting truncated and that the IE Explorer had a size limit for the number of charaters being passes as a querystring.So I think I need to go the route of posting it.But not sure how to go about it.
Private Sub GetReport()
Try
Dim hawbs As String = String.Empty[code]....
The retrieve document then does: the decrpytion gets the data(ids) and pulls the pdfs.
Private Sub CheckLogin()
If Failed == 3
'show recapacha
If Page.IsValid Then
CheckLogin2()
End If
[Code]...
What I have is a login form but I do not want to show the recapacha till there are 3 invalid login attempts. I'm not sure as to the best way to do that. Above is some mockup code to get an idea on where I am heading.
I was wondering if its possible for VB to display all available COM ports that are open. he reason that I ask this is because this program will be run on various computers where the COM port will not always be the same. I have a text box now that the user can choose which com number he/she wants but if the wrong one is entered, the program crashes rather than displaying an error message. It would also be nice for the system to show which available com numbers there are
View 5 RepliesI've written up the following code (please note i only started to learn VB yesterday)
CODE:
And what I want it to do is when a letter, or character, is entered, i want to have Label1 display "invalid" but i cant seem to figure out how...
Got a strange one and I know it is something silly but I can't see it for anything I have a DLL created in VB.net (No I can't change it! :-)) and am calling it from C#. The problems come at the point the object is created in C# and I get the message that it has "some invalid arguments".
The constructor code in the DLL is as follows:
Sub New(ByRef Connection As IConnection)
The code in C# is:
IConnection conn = new Connection();
CustomObject test = new CustomObject(conn)
It is happy with the first line but it gives the error message ("some invalid arguments") on the second line. I have also created a secondary project in VB.net and called the DLL and it works fine there.
I have the following jquery which is invalid:
{
"id": 12,
"heading": "heading goes here 3",
"content": "<p><span style="color: #ff0000;">content</span> <u><strong>goes </strong></u><span style="color: #ffffff;"><span style="background-color: #ff0000;">here</span></span> 3.</p>"
}
I am generating this with asp.net (vb.net) from data stored in a database. I think I need to somehow escape the double quotes within the content section of the json data. How do I do this?
I'm getting an invalid cast exception but I'm not sure why, here is the list of my conversions.
SQL -> VB.NET
char(4) -> String
varchar(50) -> String
tinyint -> Integer
char(1) -> Char
bit -> boolean
[Code]...
i have an app in vb.net 2008 having an employee form with includes among other controls ,a button (named btnEmpRmk) for comment and textboxes and txtEmpId for employee's ID respectively.
View 7 RepliesCLR detected an invalid program
View 8 RepliesI have form on VB2008 and Mysql as Database which have 24 textfields on a form.I want to impose certain condition that when ever user adds/updates/modifies data into database for example You may have entered text in a numeric fied or a number that is larger than the fieldsize setting permitts. if violates message box should appear with Invalid entries
View 5 RepliesHow to inform that the user has entered wrong username/invalid [code]...
View 4 Repliesi have a code below. Everything seems alright but the GetConsoleFontSize return value is invalid in my PC. it returns back cfi.dwFontSize x=0 y=7 the right result must be 8*12. i have also a VB6 code sample everything is same but why in VB.net machine i have got different result. i also tried to change declarations but i could not find an answer.[code]
View 1 RepliesI have a gridview0 in a multiview and when I click select on a row I have theGridView0_SelectedIndexChanged sub change to a different view in the multiview, which has a different gridview1 but the same datasource as gridview0. This is when it errors out and it displays the invalid column name error, with the column name being the datakeyname of the first gridview0 row that was selected
Protected Sub GridView0_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView0.SelectedIndexChanged
Dim ISTag As String = GridView0.SelectedDataKey.Value.ToString
[code].....
I am attempting to write some interface code for a piece of hardware. Because the hardware requires use of 12 control lines, I believe the parallel port is the easiest connection method. After some research, I have discovered that inpout32.dll is the most efficient solution with only two commands to worry about (inp32() and out32()). I have downloaded the dll and attempted to place it in my code using both dim and declare statements. The file resides in the root level of the project folder as well as another copy in the windows directory. No matter how I try to call the dll it gives me errors stating that libraries were expected and that the dll does not exist.
View 5 RepliesI get the following error: Heap block at 068B13D8 modified at 068B1408 past requested size of 28Invalid address specified to RtlFreeHeap( 003B0000, 068B13E0 )Invalid address specified to RtlFreeHeap( 003B0000, 068B1420 )
What I did is I have a have a custom save as dialog. Every time I hit the save button, I see the heap message. It does not always crash my program but it does. Here is my code,
Private Sub lVW_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LVW.Click
With LVW 'LVW=ListVew Name
LVW.Text = .SelectedItems.Item(0).Text
[code].....
see from the following function why I would be getting an "Invalid Cast Exception"? More specifically this is the error "Conversion from string "yyyyMMdd" to type 'Integer' is not valid." I am trying to convert a DateTime value from the database to a String with the format "yyyyMMdd" so for example October 22, 1985 would be "19851022".dbReader(fieldName).ToString("yyyyMMdd")Here is the entire function ...
Private Function GetDBReaderDateValue(ByVal dbReader As IDataReader, ByVal fieldName As String) As String
If dbReader(fieldName) Is DBNull.Value Then
[code].....
How do I get rid of invalid cast expression from the Values in the Combobox to fit in the equation in examgrade? I tried to resolve it by looking it up on MSDN, and the like but couldnt figure it out.I tried using Examgrade = ().ToString but that did not work.FYI this is my first real program, I successfully made this once in C# but deleted the source files, so this is Visual Basic and a hell of a lot easier to get this far.The asterisks mark the problem line
Public Class Calculator
Dim quarter3 As Integer
Dim quarter4 As Integer[code].....
I am getting error with the following code. The exception is Invalid column name 'pmoss;.The code seem to be perfectly but don't know what exactly went wrong.[code]
View 3 RepliesI recently upgraded a VB 6 project to .net. I'm having a problem with this block of code:
Dim CtrlName As System.Windows.Forms.MenuItem
For Each CtrlName In Form1.Controls
'Some code here
[code].....
I'm trying to connect vb to sql server using this code:
Public Class _Default
Inherits System.Web.UI.Page
Dim insertQuery As String
[Code]....
I'm new to VB, trying to connect vb to sql server using this code:
Code:
Imports System.Data.OleDb
Public Class _Default
Inherits System.Web.UI.Page
Dim insertQuery As String
Dim updateQuery As String
Dim deleteQuery As String
[Code]...
I'm receiving an Invalid Object Name for my table name how do I get it so I don't get it.
View 5 Replies
