c# - Why converting datetime to string gets me the error : ORA-01843: not a valid month -

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i have following column : 

checkingtime ------------ 1 7/5/2011 2  3  4 5/8/2012

(the colomn format date.) i'm using datareader read colomns , rows in db1 , insert them db 2 follow : 

while (dr.read()) { string finalratingdate = ((dr[19] != dbnull.value) ? convert.tostring(dr[19]) : ""); }

so when inserting it's supposed check if there's dbnull, if not, insert value, if yes insert "", thing following error :

system.data.oracleclient.oracleexception: ora-01843: not valid month

i error datetimes variable. other variables i'm able convert them string , insert them.

do have idea ?

thank you

i believe exception indicating column in database of type date , can't accommodate empty string. instead of empty string in statement, should initialize variable null, enable set null value in date column. statement be:

string finalratingdate = ((dr[19] != dbnull.value) ? convert.tostring(dr[19]) : null);

i not sure why converting datetime field string database, should use parameterized query , add datatime object parameter instead of converting string.


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