https://resources.arcgis.com/en/help/arcobjects-net/componentHelp/0044/004400000067000000.htm
IActionEdit.ReadOnly Property (ArcObjects .NET 10.1 SDK)
readonlypropertysdk
https://resources.arcgis.com/en/help/arcobjects-net/componentHelp/0044/004400000063000000.htm
IActionEdit.Edit Method (ArcObjects .NET 10.1 SDK)
editmethodsdk