Getting the error “cannot add an entity that already exists.” while inserting a table's value in to DB without procedure

Question

I am inserting a list of records to the DB table with Linq to sql like this:

//my DataContext Class
 using (VTMMedicalDBDataContext objVTMMedicalDBDataContext =          


        

Answer 1

You have to update table to have that column with identity value (autoincrement).

Then update your DBML model-> Delete the table from DBML designer, refresh your table at server explorer and drag and drop the table object again. Generate the project and it should work nice.