Question

If I do something like this:

using (SqlCommand cmd = new SqlCommand('SELECT * FROM TBL')) {     using (SqlDataReader reader = cmd.ExecuteReader())     {         while (reader.Read())         {             string s = reader.GetString(7);         }     } } 

does the Read() call read the entire row into memory, or does the GetString(7) call mean that the reader only ever reads the data in column 7?

Answer 1

it reads the whole row on the read operation.