When you decide to release a new version of an MTS/COM+ component you should take care of its compatibility with the previous version. There are three types of changes you

When you deploy COM objects in DLLs no security issues arise since DLLs run in the process of the caller. On the contrary, when you deploy your COM objects into

Consider this line of code: Dim x as Project1.Class1 Many developers think that we were declaring x as a “Project1.Class1” object. This is wrong. All object variables in VB are

A common question among VB developers is: Why is it dangerous the use of the New keyword in VB to create COM objects registered under MTS/COM+? The New keyword is

Some MTS/COM+ newbies wonder whether it is legal to store object variables in the SPM. No, you can’t!! the SPM is unaware of Apartment marshaling issues. If you ask the

Use this function to read a number decimal symbol from regional settings: Sub Form_Load()Dim DecS As StringDecS = ReadDecimalSymbol()End SubFunction ReadDecimalSymbol() As StringReadDecimalSymbol = Mid$(CStr(1.1), 2, 1)End Function

Bundling functionality and program logic into an ActiveX DLL is an excellent form of encapsulation. But even when you expose functionality to your client application, you don

Private Declare Function LoadLibrary Lib “kernel32.dll” Alias “LoadLibraryA” _ (ByVal Path As String) As LongPrivate Declare Function GetProcAddress Lib “kernel32.dll” (ByVal hModule As _ Long, ByVal ProcName As String) As

The System.IO.Directory class exposes a CreateDirectory method that, as its name suggests, can create a subdirectory. However, this method is even more powerful than it appears at a first glance,

If a form owns another form, the owned form will be always displayed in front of its owner form, no matter which is the active form. This makes owned forms

The System.Windows.Forms.Help class encapsulates the HTML Help 1.0 engine and lets you display the index, the search page, or a specific topic in an HTML file in HTML Help format

The Clip property of the System.Windows.Forms.Cursor class represents the rectangle within which the mouse cursor is confined, or Nothing if the mouse can move over the entire screen. This rectangle

The new AddHandler statement makes it possible to attach event dynamically, that is without having to bind them via static code based on the Handles keyword. This keyword is also

That way, when a parameter in your connection string changes, you only need to change it in one place versus every web page that utilizes it. Below is an example

When using VBScript in ASP, you have only one data type: VARIANT. Although you can store objects within this data type, every time you refer to a property/method of the

Check For Valid Dates

The small window is usually used as a pop-up page for advertisements or to show information concerning particular keywords.For example, you can put in a page: Requestor: James Dean When

//validation of From Date//Here FromDay,FromMonth,FromYear & ToDay,ToMonth,_ToYear are the names ofthe form fields corresponding to from date and to _dates. Assuming thatthese are drop down fields on the form.function validateFromDate(){

Suppose you need to tack on an additional value to all your custom errors in SQL Server 2000. For VB programmers, that might mean tacking on the value of vbobject

Creating Custom Errors in SQL Server is not a hard thing to do, but managing those errors across multiple developers can be difficult. The question becomes: who has already used

This stored procedure accepts tablename, fieldname, fieldvalue andfieldtype as parameters. If no fieldname, fieldvalue is passed, it deletes all records from the table passed. Fieldvalue could be a single value

When you call a COM method, it accepts BSTR in the following way: Iface->f(L””) L”” does not create a BSTR. This just creates a wide character string and if the

If you still use a lot of DOS commands or execute batch files that you have acquired or written over time, this tip can save you a lot of typing.