problem passing parameters to oracle9i from C#.net

hey

i have been facing problem in passing parameters to an oracle stored procedure from c#.net. i think the connection is alright. kindly specify how to send a string and mention any changes that have to be done in the basic code of the procedure. kindly post the code also.... thanks in advance....

the procedure runs fine if it is executed from oracle directly....

comm.Parameters.Add("isno",Convert.ToInt16(txtserial.Text));
comm.Parameters[0].Direction = ParameterDirection.Input;

comm.Parameters.Add("iname", txtname.Text );
comm.Parameters[1].Direction = ParameterDirection.Input;

this is how i tried to pass an integer value and an string to oracle....

and what error do you get

ora-01401 inserted value too large for column
ora-06512at "scott.insert_try" line 26
ora-06512 at line 1

the problem is that when the procedure is run from SQL> with same values it runs perfect. but when we pass values through our front end app. it gives the above error

put some debug in the procedure to print out the lengths of the data being inserted