VB.net code read an excel content from blob

Public Function GetExcelBlobData(filename As String, connectionString As String, containerName As String) As DataSet
	' Retrieve storage account from connection string.
	Dim storageAccount As CloudStorageAccount = CloudStorageAccount.Parse(connectionString)

	' Create the blob client.
	Dim blobClient As CloudBlobClient = storageAccount.CreateCloudBlobClient()

	' Retrieve reference to a previously created container.
	Dim container As CloudBlobContainer = blobClient.GetContainerReference(containerName)

	' Retrieve reference to a blob named "myblob.csv"
	Dim blockBlob2 As CloudBlockBlob = container.GetBlockBlobReference(filename)

	Dim ds As DataSet
	Using memoryStream = New MemoryStream()
		blockBlob2.DownloadToStream(memoryStream)
		'
'                 
'                    used third party open source Excel Data Reader - Read Excel files in .NET(http://exceldatareader.codeplex.com/)
'                    Nuget: Install-Package ExcelDataReader (https://www.nuget.org/packages/ExcelDataReader/)
'                 
'                


		Dim excelReader = ExcelReaderFactory.CreateOpenXmlReader(memoryStream)
		ds = excelReader.AsDataSet()
		excelReader.Close()
	End Using

	Return ds
End Function