对DataTable(或者DataSet)修改后，提交修改到数据库

public static void UpdateTable()
{
SqlConnection conn = null;
string sql = "select *From Course";

DataTable dt = null;
DataSet ds = new DataSet();

try
{
conn = new SqlConnection(connectionString);
SqlDataAdapter sda = new SqlDataAdapter();
sda.SelectCommand = new SqlCommand(sql, conn);
SqlCommandBuilder cb = new SqlCommandBuilder(sda);//自动生成相应的命令，这句很重要

conn.Open();

sda.Fill(ds);
dt = ds.Tables[0];

DataRow dr = dt.NewRow();
dr["ID"] = 1006;
dr["Name"] = "面向对象编程";
dr["Grade"] = "10004";
dt.Rows.Add(dr);

sda.Update(dt);//对表的更新提交到数据库
//DataRow[] drs = dt.Select(null, null, DataViewRowState.Added);//或者搜索之后再更新
//sda.Update(drs);

dt.AcceptChanges();
}
catch (SqlException ex)
{ }
finally
{
conn.Close();
}
}