// Create a dev token for import
        var devToken = PowerBIToken.CreateDevToken(workspaceCollectionName, workspaceId);
        using (var client = CreateClient(devToken))
        {
            // Import PBIX file from the file stream
            var import = await client.Imports.PostImportWithFileAsync(workspaceCollectionName, workspaceId, fileStream, datasetName);

            // Example of polling the import to check when the import has succeeded.
            while (import.ImportState != "Succeeded" && import.ImportState != "Failed")
            {
                import = await client.Imports.GetImportByIdAsync(workspaceCollectionName, workspaceId, import.Id);
                Console.WriteLine("Checking import state... {0}", import.ImportState);
                Thread.Sleep(1000);
            }

        }