This .NET enum wraps AcDb::UpdateOption ObjectARX enum. It gives the options for updating adapters.

Public Enum UpdateOption
  AllowSourceUpdate = &H100000
  ForceFullSourceUpdate = &H200000
  ForPreview = &H1000000
  IncludeXrefs = &H2000000
  None = 0
  OverwriteContentModifiedAfterUpdate = &H400000
  OverwriteFormatModifiedAfterUpdate = &H800000
  SkipFormat = &H20000
  UpdateColumnWidth = &H80000
  UpdateRowHeight = &H40000
End Enum

public enum UpdateOption {
  AllowSourceUpdate = 0x100000,
  ForceFullSourceUpdate = 0x200000,
  ForPreview = 0x1000000,
  IncludeXrefs = 0x2000000,
  None = 0,
  OverwriteContentModifiedAfterUpdate = 0x400000,
  OverwriteFormatModifiedAfterUpdate = 0x800000,
  SkipFormat = 0x20000,
  UpdateColumnWidth = 0x80000,
  UpdateRowHeight = 0x40000
}