how to retrieve data from a sql server database in c 23

1 public Person SomeMethod(string fName)
2        {
3            var con = ConfigurationManager.ConnectionStrings["Yourconnection"].ToString();
4
5            Person matchingPerson = new Person();
6            using (SqlConnection myConnection = new SqlConnection(con))
7            {
8                string oString = "Select * from Employees where FirstName=@fName";
9                SqlCommand oCmd = new SqlCommand(oString, myConnection);
10                oCmd.Parameters.AddWithValue("@Fname", fName);           
11                myConnection.Open();
12                using (SqlDataReader oReader = oCmd.ExecuteReader())
13                {
14                    while (oReader.Read())
15                    {    
16                        matchingPerson.firstName = oReader["FirstName"].ToString();
17                        matchingPerson.lastName = oReader["LastName"].ToString();                       
18                    }
19
20                    myConnection.Close();
21                }               
22            }
23            return matchingPerson;
24        }