Public ConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=db1.mdb"

Public Con As New OleDb.OleDbConnection(ConnectionString)

Public Cmd As New OleDb.OleDbCommand("", con)

Public da As New OleDb.OleDbDataAdapter("", ConnectionString)

Public dt As New DataTable
Public ds As New DataSet
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