Collection Class NOT found in C#, but found in vb.net !! Why?

In fact, I can NATIVELY use Collection in vb.net

Dim m_results As New Collection

This is the way I can use Collection in c#.  May I ask if any experts here can give me an answer what is the "suitable" way to have Collection?  or Am I correct?

Here below is one of the functions (written in VB.NET) I use Collection and "grap" the data in the DAL Layer and use it for UI Layer:

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Public Function GetBrands() As Collection

Dim m_da As New MySqlDataAdapter

Dim m_ds As New DataSet

Dim m_data As m_BrandData

Dim m_results As New Collection

Dim m_dataRow As DataRow

Dim m_SQL As String

m_da.SelectCommand = New MySqlCommand(m_SQL, m_conn)

For Each m_dataRow In m_ds.Tables("table1").Rows

m_data = New m_BrandData

With m_data

.brandCode = CStr(m_dataRow.Item("brandCode"))

.brandName = CStr(m_dataRow.Item("brandName"))

End With

m_data = Nothing

Next