using System;
using System.Data;
using System.Data.SqlClient;
class ModifyDataTable
{
static void Main()
{
string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
string sql = @"select * from employee";
SqlConnection conn = new SqlConnection(connString);
try {
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = new SqlCommand(sql, conn);
DataSet ds = new DataSet();
da.Fill(ds, "employee");
DataTable dt = ds.Tables["employee"];
dt.Columns["firstname"].AllowDBNull = true;
dt.Rows[0]["FirstName"] = "Joe";
DataRow newRow = dt.NewRow();
newRow["firstname"] = "Roy";
newRow["lastname"] = "Beatty";
dt.Rows.Add(newRow);
foreach (DataRow row in dt.Rows)
{
Console.WriteLine("{0} {1}",
row["firstname"].ToString().PadRight(15),
row["lastname"].ToString().PadLeft(25));
}
} catch(Exception e) {
Console.WriteLine("Error: " + e);
} finally {
conn.Close();
}
}
}