ถ้าใช้ datatype ใช้ sql แบบ image ต้อง insert ข้อมูลยังไงค่ะ

string sqlConnectionString = "Your conection string.";
SqlConnection sqlConnection = new SqlConnection(sqlConnectionString);

string sqlCommandString = "Insert Into [UploadFile] ([FileName], [ContentType], [BinaryStream]) Values (@FileName, @ContentType, @BinaryStream)";
SqlCommand sqlCommand = new SqlCommand(sqlCommandString, sqlConnection);

sqlCommand.Parameters.Add("@FileName", SqlDbType.NVarChar);
sqlCommand.Parameters.Add("@ContentType", SqlDbType.NVarChar);
sqlCommand.Parameters.Add("@BinaryStream", SqlDbType.Image);

sqlCommand.Parameters["@ContentType"].Value = FileUpload1.PostedFile.ContentType;
sqlCommand.Parameters["@FileName"].Value = FileUpload1.PostedFile.FileName;

BinaryReader BinaryRead = new BinaryReader(FileUpload1.PostedFile.InputStream);
byte[] BinaryData = BinaryRead.ReadBytes(FileUpload1.PostedFile.ContentLength);
sqlCommand.Parameters["@BinaryStream"].Value = BinaryData;

sqlCommand.ExecuteNonQuery();