datagridview数据更新的问题

[CSERPJAMI]

为什么下面的UPDATA更新不了???

SqlConnection conn = sqlClass.sqlcon();
SqlDataAdapter da = new SqlDataAdapter(sqlcmd, conn);
da.Fill(dataSet);
SqlCommandBuilder cb = new SqlCommandBuilder(da);
da.Update(dataSet);

[Donneyming]

//数据库数据更新(传DataSet和DataTable的对象)
public DataSet UpdateDataBase(DataSet changedDataSet,string tableName)
{
this.myConnection = new SqlConnection(connectionString);
this.da = new SqlDataAdapter(this.strSQL,this.myConnection);
this.sqlCmdBld = new SqlCommandBuilder(da);
this.da.Update(changedDataSet,tableName);
return changedDataSet;//返回更新了的数据库表
}
没错啊

[weiloe]

update()中跟上表名 看看 如：
SqlConnection conn = sqlClass.sqlcon();
SqlDataAdapter da = new SqlDataAdapter(sqlcmd, conn);
dataset ds=new dataset();
SqlCommandBuilder cb = new SqlCommandBuilder(da);
da.Fill(ds,"表名");
da.Update(ds,"表名");

[CSERPJAMI]

我加了表名,还是不行!但如果我在LOAD先绑定数据,则可以
private void Form1_Load(object sender, EventArgs e)
{

conn = sqlClass.sqlcon();
SqlDataAdapter da = new SqlDataAdapter(sqlcmd, conn);
dataset ds=new dataset();
SqlCommandBuilder cb = new SqlCommandBuilder(da);
da.Fill(ds);
dataGridView1.DataSource = ds.Tables[0];
}