Regarding Log_History table in asp.net application

hi,

the thing is i am not able to reterive the tablerowid or table name in log_history_table means(from which table the row is inserted or updated or deleted),i need username of application so i did hard coded in my dataaccess layer of asp.net,first m executing insert query for which data is inserted and at atlast m using identy_colmn to reteive the last row inserted id..
then again m executing insert query for log_history table where i mention above i need to insert(tablerowid or u can say table name,rowid(which row is inserted) user_id(application_user name),operation(insert,update).

while insertind in log_table m gettion rowid,username, operations(for opration m adding manully string for insert ,update),but m not getting tablename in  which table the record is inserted...

wht i did,in master_table from where i will get the tablerow_id  or table_name.i inserted tablerowid,tablename manully and while inserting in log history table in tablerowid column i added the values of tablerowid  that exists in master_tables manually.like this 

Eg:  insert into log_historytable(tablerowid,rowid,user_id,operations) values(1,rowid(from identitycolumn),session[userid].value.tostring(),'insert');

please teme how can i get the tablename without adding manually in log history table.in log history_table tablerowid is foreign key of master_tables table..plzz give me sum live exanple or write send some code so that i can do this.

thanks in advance sir