For SAS connection, you should follow the steps below to generate sas-url: Nav to azure portal -> your storage account -> Shared access signature:

Then copy the "Blob Service SAS URL"(if you want to operate file share / queue, you should use the respective SAS URL).
Then in the code with library Azure.Storage.Blobs, Version=12.1.0.0.:
using Azure.Storage.Blobs;
using System;
namespace ConsoleApp16
{
class Program
{
static void Main(string[] args)
{
//replace the sas_url with the one you copied in the above steps.
string sas_url = "https://xxx.blob.core.windows.net/?sv=2019-02-02&ss=bfqt&srt=sco&sp=rwdlacup&se=2020-01-07T17:04:27Z&st=2020-01-07T09:04:27Z&spr=https&sig=xxx";
Uri uri = new Uri(sas_url);
BlobServiceClient blobServiceClient = new BlobServiceClient(uri);
var blobContainer = blobServiceClient.GetBlobContainerClient("test1");
var blobclient = blobContainer.GetBlobClient("yy1.txt");
blobclient.Upload(@"d:\aa.txt");
Console.WriteLine("**completed**");
Console.ReadLine();
}
}
}