Validating data with Flat File Checker

''' <summary>
''' Evaluation Functions Available for Nodes inside Action in Flat File Schema
''' </summary>
''' <remarks></remarks>
Public Class EvaluateActionExpression
    Private _col As DataColumn
    Sub New(ByVal col As DataColumn)
        _col = col
    End Sub
    Public Function FileAlias() As String
        Return _col.datasource.AliasName
    End Function
    Public Function FileName() As String
        Return IO.Path.GetFileNameWithoutExtension(_col.Datasource.AliasName)
    End Function
    Public Function ColumnName() As String
        Return _col.Name
    End Function
    Public Function ColumnIndex() As Integer
        Return _col.Index
    End Function
    Public Function Start() As Date
        Return _col.Datasource.ValidationStart
    End Function
End Class