I have one method that executes a SQL stmt in the database and then fill my
dataset.

this method fills a table named "Cities" when i call this method for the second
time, it duplicate all the data inside the datatable.

I read in the documentation that i shoud use the MissingSchemaAction property
os the dataadapter object.

But it dont work since the fields that i´m selecting dont are prmary keys.

anyone can help me?