how to verify if an item exists in a array using excel vba?

You can use a collection instead, Keys in a collection must be unique and you get error 457 if you try to add a duplicate. So you wouldn't do it this way but here's an example.

Dim MyCollection As New Collection

On Error Resume Next
MyCollection.Add "value 1", "Key 1"
MyCollection.Add "value 2", "Key 1"
If Err.Number = 457 Then
    MsgBox "Key already in collevtion"
End If

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MyCollection.Count will be 1 at the end of the code.

Hi,

How a collection works, how i refer to an item later? How I know the dimension of the collection? How is different from an array? Thank You

Collections start at index 1 so this would return "Value 1" using the above code.

MsgBox MyCollection(1)

But how is differs from an array?

My problem is that all my codes are in arrays

In the code why value 2 gives an error if it's not equal to value 1?

EXCELLENT, THANK YOU FOR YOUR RESPONSE

In the code why value 2 gives an error if it's not equal to value 1?

Because it checks the keys and not the values, so if you want to check for duplicate values make the key the same as the value. In other words

Dim MyCollection As New Collection

On Error Resume Next
MyCollection.Add "value 99", "value 99"
MyCollection.Add "value 1", "value 1"
MyCollection.Add "value 1", "value 1"
If Err.Number = 457 Then
    MsgBox "Key already in collection"
End If

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In case it's not clear, the generalized code is

MyCollection.Add <some value>,<some key that must be a string>

You're welcome and I'm glad I was able to help.

Marty - MVP 2009 to 2013

BTW one more example. You don't have to use a key so this is perfectly valid and you wind up with 2 items in the collection.

Dim MyCollection As New Collection

On Error Resume Next

MyCollection.Add "value 1"
MyCollection.Add "value 1"

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PERFECT, SO USING THE SAME SOLVE MY PROBLEM!

There's also a more advanced type of collection called a Dictionary but I don't have much experience with them.

for me, collection is new, i am working right with it, and works perfect!