续（这个例子是针对ACCESS的更新、删除、还有定位的，希望能对你有所帮助）

            // btn_help
            //
            this.btn_help.ForeColor = System.Drawing.SystemColors.ActiveCaptionText;
            this.btn_help.Location = new System.Drawing.Point(360, 280);
            this.btn_help.Name = "btn_help";
            this.btn_help.Size = new System.Drawing.Size(88, 24);
            this.btn_help.TabIndex = 3;
            this.btn_help.Text = "帮 助(&h)";
            this.btn_help.Click += new System.EventHandler(this.btn_help_Click);
            //
            // label5
            //
            this.label5.BackColor = System.Drawing.Color.Olive;
            this.label5.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.label5.ForeColor = System.Drawing.SystemColors.ActiveCaptionText;
            this.label5.Location = new System.Drawing.Point(48, 192);
            this.label5.Name = "label5";
            this.label5.Size = new System.Drawing.Size(152, 24);
            this.label5.TabIndex = 1;
            this.label5.Text = "市场价格：";
            this.label5.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
            //
            // txt_bookstock
            //
            this.txt_bookstock.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.txt_bookstock.Location = new System.Drawing.Point(232, 240);
            this.txt_bookstock.Name = "txt_bookstock";
            this.txt_bookstock.Size = new System.Drawing.Size(216, 21);
            this.txt_bookstock.TabIndex = 2;
            this.txt_bookstock.Text = "";
            //
            // dataedit
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.AutoScroll = true;
            this.BackColor = System.Drawing.Color.Olive;
            this.ClientSize = new System.Drawing.Size(536, 389);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.statusBar,
                                                                          this.btn_help,
                                                                          this.txt_BookId,
                                                                          this.label2,
                                                                          this.label1,
                                                                          this.label3,
                                                                          this.label4,
                                                                          this.label5,
                                                                          this.label6,
                                                                          this.txt_BookName,
                                                                          this.txt_AuthorName,
                                                                          this.txt_bookprice,
                                                                          this.txt_bookstock,
                                                                          this.btn_Delete,
                                                                          this.btn_update,
                                                                          this.btn_movenext,
                                                                          this.btn_movefirst,
                                                                          this.btn_moveprevious,
                                                                          this.btn_movelast});
            this.Name = "dataedit";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "dataedit";
            this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
            this.ResumeLayout(false);

        }
        #endregion

        private void MovePrevious()
        {
            if (myBind.Position == 0)
            {
                statusBar.Text = "数据已经到头";
            }
            else
            {
                myBind.Position -= 1;
                statusBar.Text = "当前位置：" +myBind.Position.ToString();
            }
        }

        private void MoveFirst()
        {
            myBind.Position = 0;
            statusBar.Text = "当前位置：" +myBind.Position.ToString();
        }

        private void MoveNext()
        {
            if (myBind.Position == myBind.Count-1)
            {
                statusBar.Text = "数据已经到尾";
            }
            else
            {
                myBind.Position += 1;
                statusBar.Text = "当前位置：" +myBind.Position.ToString();
            }
        }

        private void MoveLast()
        {
            myBind.Position = myBind.Count-1;
            statusBar.Text = "当前位置：" +myBind.Position.ToString();
        }

        private void btn_movefirst_Click(object sender, System.EventArgs e)
        {
            MoveFirst();
        }

        private void btn_moveprevious_Click(object sender, System.EventArgs e)
        {
            MovePrevious();
        }

        private void btn_movenext_Click(object sender, System.EventArgs e)
        {
            MoveNext();
        }

        private void btn_movelast_Click(object sender, System.EventArgs e)
        {
            MoveLast();
        }

        private void btn_help_Click(object sender, System.EventArgs e)
        {
            MessageBox.Show("数据库操作练习——定位、更新、删除",System.DateTime.Now.ToShortDateString());
        }

        private void btn_Delete_Click(object sender, System.EventArgs e)
        {
            try
            {
                string strconn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=book.mdb";
                OleDbConnection conn = new OleDbConnection(strconn);
                
                conn.Open();
                string strdelete = "select * from bookstock";
                OleDbDataAdapter adapter = new OleDbDataAdapter(strdelete,conn);

                myDataSet.Tables["bookstock"].Rows[myBind.Position].Delete();
                adapter.Update(myDataSet,"bookstock");

                statusBar.Text = "记录已经删除";
                conn.Close();
            }
            catch(Exception ed)
            {
                statusBar.Text = "发生错误，原因：" + ed.Message;
                MessageBox.Show(ed.ToString());
            }
        }

        private void btn_update_Click(object sender, System.EventArgs e)
        {
            try
            {
                string strconn = "Provider=Microsoft.Jet.OlEDB.4.0;Data Source=book.mdb";
                OleDbConnection conn = new OleDbConnection(strconn);

                conn.Open();

                string strupdt = "update bookstock set booktitle = '"
                    + txt_BookName.Text + "',bookauthor = '"
                    + txt_AuthorName.Text + "',bookprice = "
                    + txt_bookprice.Text +",bookstock = "
                    + txt_bookstock.Text +" Where bookid = " + txt_BookId.Text;
                OleDbCommand comm = new OleDbCommand(strupdt,conn);
                comm.ExecuteNonQuery();

                statusBar.Text = "更新成功!";
                conn.Close();

                myDataSet = null;
                myBind = null;

                if(isbound)
                {
                    txt_BookId.DataBindings.Clear();
                    txt_BookName.DataBindings.Clear();
                    txt_AuthorName.DataBindings.Clear();
                    txt_bookprice.DataBindings.Clear();
                    txt_bookstock.DataBindings.Clear();
                    isbound = false;
                }

                GetConnected();
            }
            catch(Exception eu)
            {
                statusBar.Text = "发生错误，原因：" + eu.Message;
            }
        }
    }
}