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' For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
' initialize DocFormat
Dim docFormat As New DocFormat(Common.MapSourceFilePath(filePath))

' initialize DocMetadata
Dim metadata As DocMetadata = docFormat.DocumentProperties

Dim propertyName As String = "New Custom Property"

' check if property is not built-in
If metadata.ContainsKey(propertyName) Then
    If Not metadata.IsBuiltIn(propertyName) Then
        ' remove property

        metadata.Remove(propertyName)
    Else
        Console.WriteLine("Can not remove built-in property.")
    End If
Else
    Console.WriteLine("Property does not exist.")
End If

Dim isexist As Boolean = metadata.ContainsKey(propertyName)

' save file in destination folder
docFormat.Save(Common.MapDestinationFilePath(filePath))