非常着急,关于winform里datagridview的问题
datagridview里面数据修改后,如何自动保存到数据库? 
 我用的是access   2003 
 private   void   gridMain_CurrentCellChanged(object   sender,   EventArgs   e) 
 { 
                                     Validate(); 
                                     mainBindingSource.EndEdit(); 
                                     mainTableAdapter.Update(pricingDataSet.Main); 
 } 
 该段代码不起作用,数据并没有保存到数据库中
------解决方案--------------------http://community.csdn.net/Expert/topic/5252/5252439.xml?temp=.9005243
------解决方案--------------------Adapter.update
------解决方案--------------------你不会是修改一条保存一条吧...   
 这样效率也太低了一点吧...   
 最好的做法是都修改完了,比如单击一个 "更新 "按钮,再保存到数据库中...
------解决方案--------------------给你个例子,如果你有MSDN,请直接看: 
 ms-help://MS.MSDNQTR.v80.chs/MS.MSDN.v80/MS.VisualStudio.v80.chs/dv_fxmclictl/html/1660f69c-5711-45d2-abc1-e25bc6779124.htm   
 这个例子讲得很清楚了..   
 using System; 
 using System.Data; 
 using System.Data.SqlClient; 
 using System.Windows.Forms;   
 public class Form1 : System.Windows.Forms.Form 
 { 
     private DataGridView dataGridView1 = new DataGridView(); 
     private BindingSource bindingSource1 = new BindingSource(); 
     private SqlDataAdapter dataAdapter = new SqlDataAdapter(); 
     private Button reloadButton = new Button(); 
     private Button submitButton = new Button();   
     [STAThreadAttribute()] 
     public static void Main() 
     { 
         Application.Run(new Form1()); 
     }   
     // Initialize the form. 
     public Form1() 
     { 
         dataGridView1.Dock = DockStyle.Fill;   
         reloadButton.Text =  "reload "; 
         submitButton.Text =  "submit "; 
         reloadButton.Click += new System.EventHandler(reloadButton_Click); 
         submitButton.Click += new System.EventHandler(submitButton_Click);   
         FlowLayoutPanel panel = new FlowLayoutPanel(); 
         panel.Dock = DockStyle.Top; 
         panel.AutoSize = true; 
         panel.Controls.AddRange(new Control[] { reloadButton, submitButton });   
         this.Controls.AddRange(new Control[] { dataGridView1, panel }); 
         this.Load += new System.EventHandler(Form1_Load); 
         this.Text =  "DataGridView databinding and updating demo "; 
     }   
     private void Form1_Load(object sender, System.EventArgs e) 
     { 
         // Bind the DataGridView to the BindingSource 
         // and load the data from the database. 
         dataGridView1.DataSource = bindingSource1; 
         GetData( "select * from Customers "); 
     }   
     private void reloadButton_Click(object sender, System.EventArgs e) 
     { 
         // Reload the data from the database. 
         GetData(dataAdapter.SelectCommand.CommandText); 
     }   
     private void submitButton_Click(object sender, System.EventArgs e) 
     { 
         // Update the database with the user 's changes. 
         dataAdapter.Update((DataTable)bindingSource1.DataSource); 
     }   
     private void GetData(string selectCommand) 
     { 
         try 
         { 
             // Specify a connection string. Replace the given value with a  
             // valid connection string for a Northwind SQL Server sample