This document provides an overview of common ADO.NET objects used to interact with databases including SqlConnection, SqlCommand, SqlDataReader, and SqlDataAdapter. SqlConnection represents a connection to a database and is used to open and close connections. SqlCommand represents SQL statements and stored procedures and is used to execute queries and non-queries. SqlDataReader provides a forward-only stream of row data from a SELECT statement and SqlDataAdapter fills DataTables and DataSets from a database.

1. ADO.NET Objects SqlCommand SqlConnection SqlDataReader SqlDataAdapter DataTable DataSet DataView

3. ADO.NET Objects SqlConnection con= new SqlConnection (“Data Source=(local);Initial Catalog=Master; Integrated Security=SSPI”); SqlConnection con= new SqlConnection (“Server=<Servername>;Data Source=(local);uid=<SqlServerUserId>;Pwd=<SqlServer Password>”);

5. Open()

6. Opens the connection to our database

7. Close()

8. Closes the database connection

9. Dispose()

12. What type of interaction you want to perform with a databaseSelect Insert Delete Update SqlConnectioncon=new SqlConnection(“Data Source=(local);Initial Catalog=Master; Integrated Security=SSPI”); Con.Open(); SqlCommandcmd=newSqlCommand(“select * from student”,con); Con.Close();

14. ExecuteNonQuery()

15. Expects to run a command or a stored procedure

16. ExecuteScalar()

17. Returns only one value after executing the query

18. ExecuteReader()

19. Expects to run a query command or a stored procedure that SELECTS records

23. Read()

25. Checks if any data exists, and it is used instead of the Read()

26. Close()

27. Used to close the SqlDataReader()