一.绑定下拉框数据

     string sql = "select * from Grade";

                SqlDataAdapter sda = new SqlDataAdapter(sql,helper.Con);

                sda.Fill(ds,"Grade");

                //新建一个下拉框选项

                DataRow row = this.ds.Tables["Grade"].NewRow();

                row[0] = -1;

                row[1] = "请选择";

                this.ds.Tables["Grade"].Rows.InsertAt(row,0);

                //绑定下拉框

                this.cbograde.DataSource=ds.Tables["Grade"];

                this.cbograde.DisplayMember="GradeName";

                this.cbograde.ValueMember="GradeId";

 

    二.绑定DataGradeView数据

      //根据年级查询GradeId

            string sql = "select * from Student where GradeId='" + this.cbograde.SelectedValue + "'";

            try

            {

                studentsda = new SqlDataAdapter(sql, helper.Con);

                if (ds.Tables["Student"] != null) {

                    ds.Tables["Student"].Clear();

                }

                studentsda.Fill(ds, "Student");

                //绑定数据源和DataGradeView

                this.dgvStudent.DataSource = ds.Tables["Student"];

            }

            catch (Exception x)

            {

                MessageBox.Show(x.Message);

            }

    三.实现数据更新

      DialogResult result=MessageBox.Show("确定更改信息吗？","提示",MessageBoxButtons.YesNo,MessageBoxIcon.Information);

            if (result == DialogResult.Yes) {

                SqlCommandBuilder scb = new SqlCommandBuilder(studentsda);

                studentsda.Update(ds, "Student");

            }