Microsoft.Build.Engine 2.0.0.0 System.Enum To be added. Specifies constants that define the location in the project to insert a property. Field Microsoft.Build.BuildEngine.PropertyPosition Replace the existing Property element if it exists. Otherwise, create the Property after the last Import element in the project. 2.0.0.0 Field Microsoft.Build.BuildEngine.PropertyPosition Replace the existing Property element if it exists. Otherwise, if possible, create a new Property element as a child of an existing compatible PropertyGroup element. If necessary, create a new compatible PropertyGroup element immediately following the last PropertyGroup in the project. 2.0.0.0