CommandTimeout does not work - The timeout period elapsed prior to completion of the operation or the server is not responding

I try to run  time consuming stored procedure, but without success. Execution should take at least a couple minutes.

using (SqlConnection conn = new SqlConnection("Data Source=abc\\sqlexpress;Initial Catalog=DataBase;Integrated Security=True;Connect Timeout=1000"))
                        {
                            SqlCommand cmd = new SqlCommand(); cmd.CommandTimeout = 1000;
                            conn.Open();
                            cmd = new SqlCommand("Proc", conn);
                            cmd.CommandType = CommandType.StoredProcedure;
                            cmd.Parameters.Add("@x", SqlDbType.Int).Value = x;
                            cmd.Parameters.Add("@y", SqlDbType.Int).Value = y;
                            cmd.ExecuteNonQuery();
                        }

After a short time appears error message:

at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.

Thanks for any help.
trigeminusAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
SqlCommand cmd = new SqlCommand(); cmd.CommandTimeout = 1000;
                            conn.Open();
                            cmd = new SqlCommand("Proc", conn); <<< this cmd erases the above cmd.,,
SqlCommand cmd = new SqlCommand("Proc", conn);
cmd.CommandTimeout = 1000;
conn.Open();

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trigeminusAuthor Commented:
Of course, that's it.
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