Ingest new version Aspnet store

Change the url and name accordingly for the name naming convention

build_projects/dotnet-cli-build/EnsureFileExistsOnAzureBlobStorage.cs

@@ -0,0 +1,40 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using Microsoft.Build.Framework;
+using Microsoft.WindowsAzure.Storage.Blob;
+using System.Threading.Tasks;
+
+namespace Microsoft.DotNet.Build.CloudTestTasks
+{
+    public class EnsureFileExistsOnAzureBlobStorage : Microsoft.Build.Utilities.Task
+    {
+        [Required]
+        public string FileUrl{ get; set; }
+
+        public override bool Execute()
+        {
+            if (!ExecuteAsync().GetAwaiter().GetResult())
+            {
+                throw new FileDoesNotExistOnAzureBlobStorageException(FileUrl);
+
+            }
+            return true;
+        }
+
+        private Task<bool> ExecuteAsync()
+        {
+            var blobClient = new CloudBlockBlob(new Uri(FileUrl));
+            return blobClient.ExistsAsync();
+        }
+
+        public class FileDoesNotExistOnAzureBlobStorageException : Exception
+        {
+            public FileDoesNotExistOnAzureBlobStorageException(string message) : base(message + " cannot be found on Azure Blob Storage")
+            {
+            }
+        }
+    }
+}