base 64 encoded image to a blob azure
CloudBlockBlob cblob = cont.GetBlockBlobReference("testblob");
var bytes = Convert.FromBase64String(@"iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==");// without data:image/jpeg;base64 prefix, just base64 string
using (var stream = new MemoryStream(bytes))
{
cblob.UploadFromStream(stream);
}