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();
}
}
}