修改了TextBox内的值后，为何Updata不回数据库？
如果去修改DataGridView则能更新回数据库，为什么绑定的TextBox修改后不能updata回数据库呢？
代码如下：


public partial class Form1 : Form
{
static string connString = @ "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=persondatabase.mdb ";
string selectString = @ "select * from PersonTable ";
OleDbDataAdapter da;
DataSet ds;
OleDbConnection conn;

public Form1()
{
InitializeComponent();
conn = new OleDbConnection(connString);
//try
//{
// conn.Open();
//}
//catch (Exception e)
//{
// MessageBox.Show(e.ToString());
//}

da=new OleDbDataAdapter (selectString ,conn);
OleDbCommandBuilder cmb = new OleDbCommandBuilder(da);
ds = new DataSet();

da.Fill(ds, "PersonTable ");

dataGridView1.DataSource = ds.Tables [0] ;

textBox1.DataBindings.Add( "Text ", ds.Tables [0], "FirstName ");



}

private void button1_Click(object sender, EventArgs e)

{




da.Update(ds, "PersonTable ");

}
}

[解决办法]
帮LZ顶