FrmGradeList.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WinStudent
{
    public partial class FrmGradeList : Form
    {
        public FrmGradeList()
        {
            InitializeComponent();
        }
        private int flag = 0;//0添加，1修改
        private int editGradeId = 0;//
        private string oldName = "";
        private void FrmGradeList_Load(object sender, EventArgs e)
        {
            txt_gradeName.Text = "";
            flag = 0;//添加状态
            btn_submit.Text = "添加";
            LoadGradeList();//加载年级列表
        }
        private void LoadGradeList()
        {
            string sql = "select GradeId,GradeName from GradeInfo";
            DataTable dtGradeList = SqlHelper.GetDataTable(sql);

            dgvGradeList.DataSource = dtGradeList;
        }
        /// <summary>
        /// 添加状态的设置
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_addGrade_Click(object sender, EventArgs e)
        {
            if (flag != 0)
            {
                flag = 0;
                btn_submit.Text = "添加";
                txt_gradeName.Text = "";
            }
                
        }

        private void btn_submit_Click(object sender, EventArgs e)
        {
            //接受输入信息
            string gradeName=txt_gradeName.Text.Trim();
            //判断是否为空
            if (string.IsNullOrEmpty(gradeName))
            {
                MessageBox.Show("年级不能为空！", "添加年级提示", MessageBoxButtons.OK, MessageBoxIcon.Error);