Well this is the sma question you already posted at
Why I can't make array as class? Vb.net[
^], and you were already given the answer.
However, it probably bears repeating. First issue is that you cannot set a complete array to reference a single item. When you create the array you must initialise every element within it. Also remember, as @Ralf_Meier pointed out in the previous question, that in VB.NET when declaring an array, the number in parentheses is the upper limit of the array, not the number of elements.
So ...
Sub New()
InitializeComponent()
Dim MtTest(1) As Employee
MyTest(0) = New Employee()
MyTest(1) = New Employee()
MyTest(1).ID = 1
MyTest(1).Name = "John"
MyTest(1).BankNames(1)="ISQE Bank"
End Sub