excel - Worksheets does not work

Question

I am trying to write an excel visual basic macro.

My Problem is that this code works:

Dim x As String
x = Worksheets("Abgabe").Cells(20, 3).Value

But this doesn't:

Dim y As Worksheet
y = Worksheets("Abgabe")

Also if I use ActiveWorkbook the code doesn't work.

Dim y As Worksheet
y = ActiveWorkbook.Worksheets("Abgabe")

I'm getting this error:

Object variable or With block variable not set

What could be the problem?

Answer 1

Dim y As Worksheet

y = Worksheets("Abgabe")

Use this (You have to use Set)

Dim y As Worksheet
Set y = Worksheets("Abgabe")

From MSDN (http://msdn.microsoft.com/en-us/library/aa192490.aspx):

Set Keyword: In VBA, the Set keyword is necessary to distinguish between 
assignment of an object and assignment of the default property of the object.