急！求救，2005中用BindingSource把数据绑定到TextBox控件怎样保存？

private DataSet ds = new DataSet();
private BindingSource BindingSource1 = new BindingSource();
private SqlCommandBuilder SqlCommandBuilder1;
private SqlDataAdapter da;
private SqlConnection cn;
string cmdtext = "select XH1,KHBM,ZBXH_KFLB,ZWMC,LXR,LXDH,DZ,SFZS,ZBXH_YWY,REMARK,ZDR,ZDRQ from JCZL_KHBM_M where XH1 = " + xhh;
da = new SqlDataAdapter(cmdtext, cn);
SqlCommandBuilder1 = new SqlCommandBuilder(da);
da.Fill(ds);
BindingSource1.DataSource = ds;

this.textBox1.DataBindings.Add( "text ", ds.Tables[0], "XH1 ");

this.textBox2.DataBindings.Add( "text ", ds.Tables[0], "KHBM ");
this.textBox3.DataBindings.Add( "text ", ds.Tables[0], "ZBXH_KFLB ");
this.textBox4.DataBindings.Add( "text ", ds.Tables[0], "ZWMC ");
this.textBox5.DataBindings.Add( "text ", ds.Tables[0], "LXR ");
this.textBox6.DataBindings.Add( "text ", ds.Tables[0], "LXDH ");
this.textBox7.DataBindings.Add( "text ", ds.Tables[0], "DZ ");
this.textBox8.DataBindings.Add( "text ", ds.Tables[0], "ZBXH_YWY ");
this.textBox9.DataBindings.Add( "text ", ds.Tables[0], "REMARK ");
this.textBox10.DataBindings.Add( "text ", ds.Tables[0], "ZDR ");
this.textBox11.DataBindings.Add( "text ", ds.Tables[0], "ZDRQ ");
this.checkBox1.DataBindings.Add( "Checked ", ds.Tables[0], "SFZS ");
this.comboBox1.DataBindings.Add( "text ", ds.Tables[0], "ZBXH_KFLB ");

这样子绑定，修改后用以下语句保存：
BindingSource1.EndEdit();
da.Update(ds, "JCZL_KHBM_M ");或者直接用da.Update(ds);

都不会报错，但是数据又没有被保存存，我之前用DataGridView绑—ataTable的数据都可以正常保存（不管是新建还是修改），但是这里用DataSet绑定TextBox为什么保存会没有反应呢？

[解决办法]
try..

BindingManagerBase类..
[解决办法]
simple example :

public partial class Form1 : Form
{
SqlDataAdapter sda = new SqlDataAdapter();
DataSet ds = new DataSet();
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
DataBind();
}
private void DataBind()
{
//绑定
SqlConnection con = new SqlConnection( "server=.;database=student;uid=sa;pwd=0421 ");
sda = new SqlDataAdapter( "select * from studentDetails ", con);
SqlCommandBuilder builder = new SqlCommandBuilder(sda);
sda.Fill(ds, "student ");
this.textBox1.DataBindings.Add( "Text ", ds, "student.sno ");
this.textBox2.DataBindings.Add( "Text ", ds, "student.sname ");
this.textBox3.DataBindings.Add( "Text ", ds, "student.sage ");
}

private void button1_Click(object sender, EventArgs e)
{
//前一个
this.BindingContext[ds, "student "].Position--;
}

private void button2_Click(object sender, EventArgs e)
{
//后一个
this.BindingContext[ds, "student "].Position++;
}

private void button3_Click(object sender, EventArgs e)
{
//更新数据库
BindingManagerBase bind = this.BindingContext[ds, "student "];
bind.EndCurrentEdit();
}
}