I knew that the VB.NET has an error handling with Try..Catch statement. As I know, if there is any runtime error happen in the Try routine, it will only throw the error in the Catch. But what if there is no runtime error and I need to throw an error when I found the value of the calculation reported is invalid? Like for VB6, we can write the 'On Error Goto ErrHandler', so in VB.NET, how should we define similar method? For example, there is a simple mathematical calculation where the division of two numbers will never > 5. So if I found the result of the division is greater than 5, I want to throw an error to say the result is invalid.
what is code i should use if i want to prevent user not to leave empty word in text box after user click save button. i am using visual studio 2005, database sql 2005.
I am trying to redirect command line output to a list box in a vba macro, and I've found some code that I think might point me in the right direction, but I keep on getting the same error. When I use this code [code]It gives me the error in the title and highlights the first declaration line.What does it take to define a new "process".
I'm converting a user generated list box to an array and then generating a user defined number of random strings and placing it in a textbox.The code I have works fine as it will generate the number of random strings the user wants, except sometimes a line is blank at the top of the list but is counted as a string.
Me.connection = New RAPI connection.ActiveSync.Active += new ActiveHandler(ActiveSyncActive); Private Sub ActiveSyncActive() .................. End Sub
I have an object, say Order where if an error occurs, it raises the ErrorOccurred event. If I'm running some code in say, the codebehind for a .aspx page with an public Order registered as WithEvents and I want to check to see if an error has occurred before I run more code, how do I do this? I can't simply check theOrder.ErrorOccurred. Do I have to create a local boolean flag that switches over in the event handler (OnErrorOccurred)?
Example:
Public WithEvents theOrder As New Order Public Sub DoStuff() theOrder.DoSomething() If theOrder.ErrorOccurred Then
I have created a User Defined Control that contains Add, Save, Edit, Search, Delete & Close Buttons. I added this User Defined Control in a New Form & How can I call Add, Save, EditSearch, Delete & Close Buttons of User Defined Controls from the New Form. What is the Code for calling a button of User Defined Controls from its Parent form?
example of a user-defined exception in VB.Net. I already have two examples that I was able to find online, but other than that, I cannot think of any more. I need to find at least 5 to put in my notes, and then submit to my teacher.The two I have so far are: invalid login information (such as improper username or password), and expired credit card information on an online store.
I'm a new user of VB.Net. I do have doubt on accessing a user defined Function or Sub. In some place of program, I do see the term "Call" when using the Function/Sub. In some other place without "Call". But both works perfectly. May I know the difference between the two.
I apologize in advance about asking a newbie question. I am a less-than-intermediate programmer who has done most of his work in VB6, and now trying to wrap my mind around the new concepts of the NET languages.In VB 2010, I have a Structure called "Direction", with one data member -- an integer named "Value". It's supposed to represent a value of degrees from 0 to 359.
Is there a way to create a user-defined ImageList? I would like the user to be able to assign images to ImageList that would be stored for use in future sessions.
Well I had a thread going that branched out to this topic, so rather completely veering off the main topic there, I felt creating a new thread was adequate.So as the title says, I'm trying to create a user-defined type. It's not a simple type at that but a user here had showed me a way to fix all my problems. That was to create a type BigDecimal. Which my initial thought was to utilize the BigInteger type. Being that the Integer Part, and Fractional parts would be split off into two variables, both BigIntegers. Which would be combined at the end as a "decimal". However I have many many questions see that this is my first attempt at truly creating a type of my own. So as of right now I'm basically swinging in the dark here.
Im using a simple access database with only 2 tables and I creadted a form with a datagrid to show all data inside the tables, and now i want to create search buttons for each field of the table . like, "seach by Name", Seach by date" etc... i tried to use the simple code
Code:
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click Dim cod As String cod = InputBox("Type the Id to search: ", "Search By ID") If cod <> " " Then
[code]....
My biggest problem now is that this code works very well to search by id (which is my table primary key), but now i want to search by other fields and this code only allows to search by primary key! Is there any way to use something similar to this code to search by other fields?
This program would allow users to click a button and display three different types of patterns (shown below). The user could also enter the number of rows they wanted to display and a character that they wanted to use for the pattern (*, &, etc).[code]...
I am having trouble with this code. Can someone tell me why the "Project Processing' section doesn't run at all? The 'Client Processing' section runs and executes find but it seems the 'Project Processing' section does not. very frustrated at the moment!
I have a database of 7 items that I want the user to be able to choose the order in which each is listed for use further along in programming. I'm thinking of using combboxes bound to the database. I found out that each combobox will have to have its own dataset otherwise they will all show whatever the current one that has focus changes to. Is there an easier way to be able to do this or is having 7 datasets bound to the comboboxes the best way? For this purpose I don't need all the contents listed in a DGV, only need the component name for now if this helps. Database programming is new to me and I'm a hobbyist programmer from VB6 days making the transition.
In order to take advantage of the spell checking ability of WPF textboxes, I have added one to a user control (with the use of elementhost). This user control is used in various window forms. My current problem is trying to handle keyup events from this textbox but the windows form is unable to "get" any event from the control. I can access the properties of the textbox just fine (i.e. text, length, etc.) but keyboard events don't seem to work.I have found, however, that the following will bring back events from the WPF textbox:
Public Class MyUserControl Private _elementHost As New ElementHost Private _wpfTextbox As New System.Windows.Controls.Textbox
[code].....
The user control is now able to do something after the PreviewKeyUp event is fired in the WPF textbox. Now, I'm not completely sure how to have the window form containing this user control to work with this.
I have to get the balance from the web server. Once that is done it will call back into my main app with the result.However, sometime the web server fails for some unknown reason. Could be high volume of traffic or something else. However, I haven't implemented any exception handling in my class. As the app that uses this handles the exception. However, the client has confirmed that when the web server does fail it displays a unhandled exception dialog box. Then they have to click continue to keep using my application. So below I am not sure if I should implement the exception handling in my class.[code]
On the SQL server I create a UDF. Let's name it fnCompanyDetails. It selects some information about a company from several joint tables.I then drag-and-drop this function in the new .dbml of my VB project. I want to use it with LINQ. Smth like this:
The main function receives data, uses additional functions to calculates the result and gives it back. But at one point, the function needs data from the SQL Server. I wrote a second UDF, made it visible and deployed it to the SQL Server. I see now two functions under > programmability > functions > scalar value functions:
1. The main function (IsCalcDay) and
2. The function with the data access (IsHoliday)
If I call directly the second function from VST in the debug mode, it works fine, bur if I call it via the main function, the code stops if the connection will be opened. The error is "Data access in this context is not permitted. The context is a function or method that is not marked with DataAccessKind.Read SystemDataAccessKind.Read or a callback to retrieve data from the FillRow method of a table-valued function or a UDT validation method." (translatet from German, probably slightly differnt in English)
VST (2010 prof) and the SQL Server (2008 R2) are running in my virtual W7 maschine.
Here is the code of the second function:
Imports System Imports System.Data Imports System.Data.SqlClient Imports System.Data.SqlTypes
[Code]....
Why can I open the connection if I call the function directly, but it fails if the function is called from another function?
Maybe I have missed something obvious. Currently I am using the feedback interrupt to change the cursor to one of the Windows supplied cursors
Instead of using the pre-packaged cursors, is it possible to use my own custom-cursor (icon), and if so - are there any rules re size etc., or can I use something like a png/jpg etc.. ?
I would like to make a "deep copy" of a class object that I have defined. See Visual Basic 2005 Code below
Dim MyStuff1 as new MyClass Dim MyStuff2 as new MyClass mystuff1.getbyID(anID) mystuff2 = mystuff1
Unfortunately the statement "mystuff2 = mystuff1" makes a "shallow copy" of mystuff1. Therefore, if mystuff1 is redefined then so is mystuff2. What do I have to do in MyClass to implement a deep copy method such that operations on mystuff1 and mystuff2 are independent?I would prefer something like
mystuff1.deepcopy(mystuff2) or mystuff2 = mystuff1.deepcopy()
