Getting timeout error while updating a record from c#

Question

Hi,
I have around 30k records in a tables. When I update that record inside the Transaction (Enterprise Data Library, c#) , it takes long time and throws timeout error.
But I am able to update the same record via Toad.
In the morning I tried same updating the record, it works without any change in the code or script.+
is it due table lock or db related issue? please adivse, how to resolve if occurs again.
anand

Answer 1

Code:
private static void Save()
using (DBTransactionManager dbTransactionManager = new DBTransactionManager())
try
DataTableDAL.Instance.ExecuteDML("Update Voyage SET BallastBonus = 30000 WHERE ID = 'AE53B610BEA743EC8AFBAED0C8349BF8';");
//commit database
dbTransactionManager.Commit();
catch
dbTransactionManager.RollBack();
throw;
Table
Column Name     ID     Pk     Null?     Data Type     Default     Histogram     Encryption Alg     Salt
ID     1     1     N     NVARCHAR2 (32)          None          
CALCNUMBER     2          N     NUMBER (10)          None          
CURRENCYID     3          N     NVARCHAR2 (32)          Frequency          
CALCTYPE     4          N     NUMBER (5)          Frequency          
ESTIMATEDESCRIPTION     5          Y     NVARCHAR2 (200)          None          
ESTIMATEGROUPDESCRIPTION     6          Y     NVARCHAR2 (200)          None          
BALLASTBONUS     7          Y     NUMBER (12,2)          None          
BALLASTBONUSCOMMPCT     8          Y     NUMBER (6,3)          None          
ISESTIMATE     9          N     NUMBER (1)          None          
ADDITIONALSTEAMVALUE     10          Y     NUMBER (8,4)          None          
ISADDITIONALSTEAMPCT     11          Y     NUMBER (1)          None          
ADDITIONALPORTVALUE     12          Y     NUMBER (8,4)          None          
ISADDITIONALPORTPCT     13          Y     NUMBER (1)          None          
CREATEDBY     14          N     NVARCHAR2 (32)          Frequency          
CREATEDDATE     15          N     DATE          None          
UPDATEDBY     16          Y     NVARCHAR2 (32)          None          
UPDATEDDATE     17          Y     DATE          None          
LUMPSUMCARGOCOST     18          Y     NUMBER (1)          None          
BUNKERPRICEMETHOD     19          Y     VARCHAR2 (30 Byte)          None          
INCCONTCALCRESULT     20          Y     NUMBER (1)          None          
FINAL_EST     21          Y     NUMBER          None          
SPOT_VOYAGE     22          Y     NUMBER (1)          None          
ISRUNCOSTEDIT     23          Y     NUMBER (1)          None          
Index
Table doesnt have any index, except primary key index.
Total Records
35,000
Hope this input might sufficient to help me.