Reference to a non-shared member requires an object reference.

I'm missing something basic but I can't work it out..

I have a Public Class with a Public Function inside it (This is in a BLL DLL)

Public Class CompanySearch
    Public Function Search(ByVal searchText As String) As CompanyName
        Dim companySearchList As New CompanyNameCollection(searchText, False)

        If companySearchList.Count = 1 Then
            Dim company As CompanyName = companySearchList.Item(0)
            Return company
        Else
            Using CompanySearchForm = New CompanySearch()
                With CompanySearchForm
                    .SearchTextBox.Text = searchText
                    .SearchResultDataGridView.DataSource = companySearchList
                    .ShowDialog()
                End With
                Dim company As CompanyName = companySearchList.Item(0)
                Return company
            End Using
        End If
    End Function
End Class

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I am trying to call it from the UI

Dim company As New CompanyName
company = CompanySearch.Search(CompanyNameTextBox.Text)

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But I am getting the "Reference to a non-shared member requires an object reference" Error.
I thought I was giving it an Object Reference by using a Instance of the CompanyName Class?