public class XVField : XField

Public Class XVField
	Inherits XField

Imports System
Imports BioloMICS.BioCallback
Imports BioloMICS.SharedClasses
Imports Biolomics.Utility.DatabaseConstants

Public Class Program

    <STAThread()>
    Shared Sub Main()
        Dim program As New Program
        program.ChangeField()
    End Sub

    '    Write sub functions here
    Public Sub ChangeField()
        '    get the current connection
        Dim SqlCo As XConnection = Run.GetCurrentConnection()
        If SqlCo Is Nothing Then
            Return
        End If

        '    get a table from its User name
        Dim TableDef As XTableDef = SqlCo.GetTableDefByUserNameEng("Your_Table_Name")
        If TableDef Is Nothing Then   '    may happen if that table doesn't exist
            Return
        End If
        '    load a Field from that table
        Dim FieldDefMap As New XFieldDefMap
        Dim FieldDef As XFieldDef = SqlCo.GetFieldByDBName("Your_V_Field_name", TableDef.Key)
        If FieldDef Is Nothing Then   '    that field doesn't exist
            Return
        End If
        FieldDefMap.Add(FieldDef)

        '    load second record
        Dim Where As XWhere = XWhere.Eq(StaticFields.id, 2)
        Dim RecordMap As XRecordMap = Run.LoadRecords(TableDef.Key, FieldDefMap, Where)

        For Each Record As XRecord In RecordMap
            Dim Field As XVField = TryCast(Record.Fields(FieldDef.Key), XVField)
            If Field Is Nothing Then   '    this field doesn't exist or is not a V-Field
                Continue For
            End If
            '    check the validity of the field state
            If Field.Value < 0 OrElse Field.Value >= FieldDef.StateCount Then
                Field.Value = 0
            End If
            '    change value
            If Field.Value = 3 Then
                Field.Value = 2
            End If

            Record.Save(False)
        Next
    End Sub

End Class