using System;
using System.Data;
using System.Data.SqlClient;
class PersistDeletes
{
static void Main(string[] args)
{
string connString = @"server = .\sqlexpress;integrated security = true;database = northwind";
string qry = @"select * from employees where country = 'UK'";
string del = @"delete from employees 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"];
SqlCommand cmd = new SqlCommand(del, conn);
cmd.Parameters.Add("@employeeid",SqlDbType.Int,4,"employeeid");
string filt = @"firstname = 'Roy' and lastname = 'Beatty'";
foreach (DataRow row in dt.Select(filt))
{
row.Delete();
}
da.DeleteCommand = cmd;
da.Update(ds, "employees");
foreach (DataRow row in dt.Rows)
{
Console.WriteLine(row["firstname"]);
Console.WriteLine(row["lastname"]);
Console.WriteLine(row["city"]);
}
}
catch (Exception e)
{
Console.WriteLine("Error: " + e);
}
finally
{
conn.Close();
}
}
}
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