管理模块/教师信息添加.aspx.cs

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using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class 教师信息添加 : System.Web.UI.Page
{
    public string sqlconn;
    DataRow dtr;
    SqlDataAdapter myadapter;
    SqlCommandBuilder scb;
    DataSet myDataSet;
    SqlConnection mysqlconnection;
    int returnValue;
    DataTable tb;
    int numberOfRow;
    int i;
    string sTime;
    protected void Page_Load(object sender, EventArgs e)
    {
        sqlconn = "server=.;database=学生成绩智能管理系统;Integrated Security=True;";
        mysqlconnection = new SqlConnection(sqlconn);
        SqlCommand mysqlcommand = mysqlconnection.CreateCommand();
        mysqlcommand.CommandText = "select max(教师编号) as 最大编号 from 教师表";
        myadapter = new SqlDataAdapter();
        myadapter.SelectCommand = mysqlcommand;
        myDataSet = new DataSet();
        mysqlconnection.Open();
        numberOfRow = myadapter.Fill(myDataSet, "教师表");
        mysqlconnection.Close();
        tb = myDataSet.Tables["教师表"];
        TextBox1.Text = Convert.ToString(myDataSet.Tables["教师表"].Rows[0]["最大编号"]);
        Button2.Enabled = false;
        Button3.Enabled = false;
        if (!IsPostBack)
        {
            for (i = 1970; i < 2030; i++)
            {
                this.DropDownList1.Items.Add(Convert.ToString(i));
            }
            for (i = 1; i <= 12; i++)
            {
                this.DropDownList2.Items.Add(Convert.ToString(i));
            }
            for (i = 1; i <= 31; i++)
            {
                this.DropDownList3.Items.Add(Convert.ToString(i));
            }
        }
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        if (TextBox2.Text == "" || TextBox3.Text == "" || TextBox5.Text == "" || TextBox8.Text == "")
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