в чем отличие операции задания переменной в visual basic 6 и visual basic 10

VB .NET
Dim a, b, c As Integer

VB6
Dim a As Integer
Dim b As Integer
Dim c As Integer

VB .NET
Dim a As Integer = 123

For b As Integer = 0 to 100
Next b

VB6
Dim a As Integer
a = 123

Dim b As Integer
For b = 0 to 100
Next b