Please find the below code, this will work for you.
void UploadBlobWithRestAPI() {
string storageKey = "<your access key here>";
string storageAccount = "<your storage account name here>";
string containerName = "<your container name here>";
string blobName = "test.txt";
string method = "PUT";
string sampleContent = "This is sample text.";
int contentLength = Encoding.UTF8.GetByteCount(sampleContent);
string requestUri = $"https://{storageAccount}.blob.core.windows.net/{containerName}/{blobName}";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUri);
string now = DateTime.UtcNow.ToString("R");
request.Method = method;
request.ContentType = "text/plain; charset=UTF-8";
request.ContentLength = contentLength;
request.Headers.Add("x-ms-version", "2015-12-11");
request.Headers.Add("x-ms-date", now);
request.Headers.Add("x-ms-blob-type", "BlockBlob");
request.Headers.Add("Authorization", AuthorizationHeader(method, now, request, storageAccount, storageKey, containerName, blobName));
using (Stream requestStream = request.GetRequestStream()) {
requestStream.Write(Encoding.UTF8.GetBytes(sampleContent), 0, contentLength);
}
using (HttpWebResponse resp = (HttpWebResponse)request.GetResponse()) {
MessageBox.Show(resp.StatusCode.ToString());
}
}
public string AuthorizationHeader(string method, string now, HttpWebRequest request, string storageAccount, string storageKey, string containerName, string blobName) {
string headerResource = $"x-ms-blob-type:BlockBlob\nx-ms-date:{now}\nx-ms-version:2015-12-11";
string urlResource = $"/{storageAccount}/{containerName}/{blobName}";
string stringToSign = $"{method}\n\n\n{request.ContentLength}\n\n{request.ContentType}\n\n\n\n\n\n\n{headerResource}\n{urlResource}";
HMACSHA256 hmac = new HMACSHA256(Convert.FromBase64String(storageKey));
string signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));
String AuthorizationHeader = String.Format("{0} {1}:{2}", "SharedKey", storageAccount, signature);
return AuthorizationHeader;
}
I hope this will help.