newbie :: missing primarykey exception?

Question

Dear All i'm really new to .net and using database. I use access database using OleDbconnection I want to get a row from a table DataRow targetRow=member.Rows.Find(new Object[]{userId)}; but i got exception the table don't have primary key  but i'm sure i have set the primary key when creating the table. Please help..

Andrzej Wegierski · Answer

May be You dropped previous primary key definition (for instance by replacing created datatable with new one). May be primary key has null columns - this mistake doesnt't generate exception. Check for existance and columns in primary key - may be using debugger