将vb6转换为vb.net时，station不是有效的名称空间

我正在尝试将vb6转换为vb.net，上面的代码第一行显示错误，该语句在名称空间中无效…请帮助我替换

Public Function fnGetNextMaxNo(ByVal strFieldName As String) As Integer

    fnGetNextMaxNo = 0
    Dim adoRs As VbToRecordSet
    Dim strSql As String = ""
    Try
        fnGetNextMaxNo = 1

        strSql = "select max(" + strFieldName + ") from " + strTableName
        mstrLastExecutedSql = strSql
        adoRs.Open(strSql, adoconDb)
        If Not adoRs.EOF Then
            If Not IsDBNull(adoRs.Fields(0).Value) Then
                fnGetNextMaxNo = Convert.toDouble(adoRs.Fields(0).Value) + 1
            End If
        End If

        adoRs.Close()
        Exit Function

与

Dim adoRs As VbToRecordSet

 Dim adoRs As adodb.RecordSet