ADO.NET 2.0中的DataSet和DataTable

using (SqlConnection cn = new SqlConnection(cnStr))
{
cn.Open();
SqlCommand cmd = new SqlCommand(sqlAllCustomers, cn);
SqlDataAdapter adpt = new SqlDataAdapter(cmd);
DataTable dtCust1 = new DataTable("Customers");
adpt.Fill(dtCust1);
dtCust1.PrimaryKey = new DataColumn[]{dtCust1.Columns["CustomerID"]};
    DataTable dtCust2 = dtCust1.Clone();
DataRow row1 = dtCust2.NewRow();
row1["CustomerID"] = "ALFKI";
row1["CompanyName"] = "Some Company";
dtCust2.Rows.Add(row1);
    DataRow row2 = dtCust2.NewRow();
row2["CustomerID"] = "FOO";
row2["CompanyName"] = "Some Other Company";
dtCust2.Rows.Add(row2);
    DataSet ds = new DataSet("MySillyDataSet");
ds.Tables.Add(dtCust1);
ds.Merge(dtCust2);
    dgTest.DataSource = dtCust1;
}

dtCust1.Merge（dtCust2）；

using (SqlConnection cn = new SqlConnection(cnStr))
{
SqlCommand cmd = new SqlCommand(sqlAllCustomers, cn);
SqlDataAdapter adpt = new SqlDataAdapter(cmd);
DataTable dtCustomers = new DataTable("Customers");
adpt.Fill(dtCustomers);
DataTableReader dtRdr = ds.CreateDataReader();
dgvCustomers.DataSource = dtRdr;
}

using (SqlConnection cn = new SqlConnection(cnStr))
{
// Create the Command and Adapter
SqlCommand cmd = new SqlCommand(sqlAllCustomers, cn);
SqlDataAdapter adpt = new SqlDataAdapter(cmd);
    // Create a DataTable and fill it
DataTable dtCustomers = new DataTable("Customers");
adpt.Fill(dtCustomers);
    DataSet ds = new DataSet();
ds.Tables.Add(dtCustomers);
adpt.SelectCommand = new SqlCommand("SELECT * FROM Orders", cn);
adpt.Fill(ds, "Orders");
    // Create the DataTableReader (it is disconnected)
using(DataTableReader dtRdr = ds.CreateDataReader())
{
do
{
Console.WriteLine("******************************");
while (dtRdr.Read())
{
Console.WriteLine(dtRdr.GetValue(0).ToString());
}
}
while (dtRdr.NextResult());
}
}

DataTableReader dtRdr = dt1.CreateDataReader（）；
　DataTable dt2 = new DataTable（）；
　dt2.Load（dtRdr）；

DataTable dt = new DataTable("foo");
DataColumn pkCol = new DataColumn("ID", Type.GetType("System.Int32"));
pkCol.AutoIncrement = true;
pkCol.AutoIncrementSeed = 1;
pkCol.AutoIncrementStep = 1;
dt.Columns.Add(pkCol);
dt.PrimaryKey = new DataColumn[] { pkCol };
dt.Columns.Add("SomeNumber", Type.GetType("System.Int32"));
dt.Columns["SomeNumber"].Unique = true;
int limit = 1000000;
int someNumber = limit;
DateTime startTime = DateTime.Now;
for (int i = 1; i <= limit; i++)
{
DataRow row = dt.NewRow();
row["SomeNumber"] = someNumber—;
dt.Rows.Add(row);
}