Migrating from VB 6.0 to VB.NET - Some Tips

Posted Date: 07 Feb 2005	Resource Type: Articles	Category: .NET Framework
Author: Venkat BS	Member Level: Gold
Rating:	Points: 10

MIGRATION TIPS FROM VB 6.0 TO VB.NET

Points to consider when you migarate your code from VB 6.0 to VB.Net

Data Type Changes

VB.NET has no currency data type. Instead it provides decimal as a replacement.

VB.NET introduces a new data type called Char. The char data type takes 2 bytes and can store Unicode characters.

VB.NET do not have Variant data type. To achieve a result similar to variant type you can use Object data type. (Since every thing in .NET - including primitive data types - is an object, a variable of object type can point to any data type).

In VB.NET there is no concept of fixed length strings.

In VB6 we used the Type keyword to declare our user defined structures. VB.NET introduces the structure keyword for the same purpose. The rest of the syntax is same.

The Visual Basic 6.0 Long datatype is now the Visual Basic .NET Integer datatype, and the Visual Basic 6.0 Integer datatype is now the Visual Basic .NET Short datatype.

Variable Declaration

All variables must be declared with appropriate data type. Dim x (Not allowed)

Arrays

Arrays are zero based index by default

Error Handling

On error resume next error handling statements will work in VB.Net but advised to use Try.. Catch.. block.

Property Syntax

Visual Basic .NET introduces a more intuitive syntax for properties, which groups Get and Set together. Your property statements are upgraded as shown in the following example:


Property Get MyProperty() As Integer
    MyProperty = m_MyProperty
End Property
Property Let MyProperty(NewValue As Integer)
    m_MyProperty = NewValue
End Property

is upgraded to:


Property MyProperty() As Short
    Get
        MyProperty = m_MyProperty
    End Get
    Set
        m_MyProperty = Value
    End Set
End Property

Others

All subroutines should enclose with paranthesis

VB.NET no longer supports default properties. You must explicitly specify the property you wish to access from an object.

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