asp.net 读取XML并查询

Dim UploadDataSet As DataSet = New DataSet

UploadDataSet.ReadXml(Server.MapPath("uploadConfig.xml"))
Dim row As DataRow
With UploadDataSet.Tables(0)
'Dim keys() As DataColumn = New DataColumn(1)
Dim keys(1) As DataColumn

keys(0) = .Columns("type")
.PrimaryKey = keys
row = .Rows.Find("attach")
Dim AllowFileType As String = row.Item("AllowFileType")
Dim MaxSize As Int16 = row.Item("MaxSize")
Dim NotAllowFile As String = row.Item("NotAllowFileType")

End With