Consultation on rapid big data entry to SQL-server through C# - bulk

See more:

C#

SQL-Server

i have C# WinForm program that i need to insert fast big data to sql-server.

The sql-server is in cloude server, and the file that i load in local computer.

the file is Text (Tab delimited) in

d:\TEST\TEST.txt and has Full permissions

BAR    DES     MAK
111    aaa     222
333    bbb     333
.
.

the sql-server table is CatTbl:

BAR nvarchar(250)
DES nvarchar(250)
MAK nvarchar(250)

i try to insert like this:

SQL = @"BULK INSERT CatTbl FROM 'd:\TEST\TEST.txt' WITH (CODEPAGE=1255,FIELDTERMINATOR = '\t')";
Cmd = new SqlCommand(SQL, Conn);
Cmd.ExecuteNonQuery();
Cmd.Dispose();

when i work on local sql-server its works excellent.

but in cloude sql-server i got error:

Cannot bulk load because the file "d:\TEST\TEST.txt" could not be opened. Operating system error code 21(The device is not ready.).
Please note that the sql-server connection is successful
I searched the web and found no answer that solved the problem. I would appreciate some help

What I have tried:

SQL = @"BULK INSERT CatTbl FROM 'd:\TEST\TEST.txt' WITH (CODEPAGE=1255,FIELDTERMINATOR = '\t')";
Cmd = new SqlCommand(SQL, Conn);
Cmd.ExecuteNonQuery();
Cmd.Dispose();