Persist Changes : SqlDataAdapter « ADO.Net « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. ADO.Net
3. SqlDataAdapter

using System;
using System.Data;
using System.Data.SqlClient;

    class PersistChanges
    {
        static void Main(string[] args)
        {
            string connString = @"server = .\sqlexpress;integrated security = true;database = northwind";
            string qry = @"select * from employees where country = 'UK'";
            string upd = @"update employees set city = @city where employeeid = @employeeid";
            SqlConnection conn = new SqlConnection(connString);
            try
            {
                SqlDataAdapter da = new SqlDataAdapter();
                da.SelectCommand = new SqlCommand(qry, conn);
                DataSet ds = new DataSet();
                da.Fill(ds, "employees");

                DataTable dt = ds.Tables["employees"];
                dt.Rows[0]["city"] = "Wilmington";
                foreach (DataRow row in dt.Rows)
                {
                    Console.WriteLine(row["firstname"]);
                    Console.WriteLine(row["lastname"]);
                    Console.WriteLine(row["city"]);
                }
                SqlCommand cmd = new SqlCommand(upd, conn);
                cmd.Parameters.Add("@city",SqlDbType.NVarChar,15,"city");
                SqlParameter parm =cmd.Parameters.Add("@employeeid",SqlDbType.Int,4,"employeeid");
                parm.SourceVersion = DataRowVersion.Original;
                da.UpdateCommand = cmd;
                da.Update(ds, "employees");
            }
            catch (Exception e)
            {
                Console.WriteLine("Error: " + e);
            }
            finally
            {
                conn.Close();
            }
        }
    }