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Found it you have to instantiate a Workspace by passing it the same working directory then call

LocalWorkspace aPulumiWorkspace = await LocalWorkspace.CreateAsync(new LocalWorkspaceOptions() { WorkDir = path });

var StackArgs = new LocalProgramArgs("StackName", path);
            this.Stack = await LocalWorkspace.CreateOrSelectStackAsync(StackArgs);

aPulumiWorkspace .RemoveStackAsync("StackName")

This looks like something I’ll need pretty soon. Thanks for sharing!