实现Windows的数据绑定

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");
            }