try
 {
  //赋予sql字符串数据
  string strsql1 = "insert into yhxx (zh,mima) values ('" + Tet_zh.Text + "','" + Tet_mima.Text + "')";
  //创建字符串对象
  mycom = new SqlCommand(strsql1, myconn);
  mycom.ExecuteNonQuery();
  //关闭数据库
  myconn.Close();
  Response.Write("<script>alert('添加成功！！')</script>");
  //保存账号
  //str = Tet_zh.Text;
  //保存用户名
  Application["name"] = Tet_zh.Text;
  //如果成功了成功转入
  Response.Redirect("Useradd.aspx");
 }
 catch (Exception ex)
 {
  Response.Write("<script>alert('用户已存在！！')</script>");
 }

protected void tianjia()
 {
 //添加用户信息
 try
 {
  //赋予sql字符串数据
  
  string strsql1 = "update yhxx set xm='"+Tet_xm.Text+"',xb='"+tet_xb.Text+"',qq='"+Tet_qq.Text+"',Email='"+Tet_email.Text+"',dizhi='"+tet_home.Text+"',enjioy='"+Tet_enjoy.Text+"' where zh='"+Application["name"]+"'";
  // 创建字符串对象
  mycom = new SqlCommand(strsql1, myconn);
  mycom.ExecuteNonQuery();
  //关闭数据库
  myconn.Close();
  Response.Write("<script>alert('添加成功！！')</script>");
  Response.Redirect("denglu.aspx");
 }
 catch (Exception ex)
 {
  Response.Write("<script>alert('添加失败！！')</script>"+ex.Message.ToString());
 }
 }

 //普通用户登录,管理员登录雷同
 try
 {
  string sql = "select * from yhxx where zh='"+Tet_zh.Text+"' and mima='"+Tet_mm.Text+"' and yhlb='"+tet_dz.Text+"'";
  //创建命令对象
  SqlCommand com = new SqlCommand(sql,myconn);
  //创建读取对象
  SqlDataReader dr = com.ExecuteReader();
  //成功弹出提示框
  //MessageBox.Show("读取成功！！");
  if (dr.Read())
  {
  dr.Close();
  myconn.Close();
  Application["name1"] = Tet_zh.Text;
  Response.Redirect("index.aspx");
  }
  else
  {
  Response.Write("<script>alert('用户名或密码有误！！')</script>");
  }

 }
 catch (Exception ex)
 {
  Response.Write("<script>alert('登录失败！！')</script>");
 }

try
 {
  //打开数据库
  myconn.Open();
 }
 catch (Exception ex)
 {
  Response.Write("<script>alert('数据库打开失败')</script>");
 }
 try
 {
  //创建数据字符串
  if (tet_name.Text == "")
  {
  Response.Write("<script>alert('名称不能为空！')</script>");
  }
  else
  {
  string strsql3 = "select BookID as 图书编号,BookName as 图书名称,"
    + "Booklb as 图书类别,Bookzz as 图书作者,Booklr as 图书内容,"
    + "Bookfm as 图书封面,Bookjg as 图书价格,Bookzt as 图书借阅状态 "
    + " from Bookxx where BookName='" + tet_name.Text + "'";
  mycom = new SqlCommand(strsql3, myconn);
  //打开数据库
  //myconn.Open();
  //
  myread = mycom.ExecuteReader();
  GridView1.DataSource = myread;
  GridView1.DataBind();
  GridView1.Visible = true;
  //关闭数据
  myread.Close();
  myconn.Close();
  }
 }
 catch (Exception ex)
 {
  Response.Write("<script>alert('查询失败！')</script>" + ex.Message.ToString());
 }

1.先添加图书
 if (myread.Read())
 {
  if (tet_zt.Text == "0")
  {
  //添加借阅信息表
  myread.Close();
  string strsql5 = "insert into Bookjyxx (ISBookID,ISBookname,ISBookzt,ISname,ISid) " +
  " values (" + Tet_Bookid.Text + ",'" + tet_Name.Text + "'," + tet_zt.Text + ",'" + Tet_xm.Text + "'," + Tet_ID.Text + ")";
  mycom = new SqlCommand(strsql5, myconn);
  mycom.ExecuteNonQuery();
  //关闭
  myconn.Close();
  myread.Close();
 //////////////////////////////////////
  xiugai();
  chaxun();
  }
  if (tet_zt.Text == "1")
  {
  Response.Write("<script>alert('该书正在借阅中')</script>");
  chaxun();
  }
 2.再分别修改借阅状态
  //创建
 //先修改图书表状态信息
 string strsql7 = "update Bookxx set Bookzt='1' where BookID='" + Tet_Bookid.Text + "'";
 mycom = new SqlCommand(strsql7, myconn);
 myconn.Close();
 myconn.Open();
 mycom.ExecuteNonQuery();
 //再修改借阅状态表信息
 string strsql8 = "update Bookjyxx set ISBookzt='1' where ISBookID='" + Tet_Bookid.Text + "'";
 mycom = new SqlCommand(strsql8, myconn);
 mycom.ExecuteNonQuery();
 Response.Write("<script>alert('借阅成功！')</script>");
 //关闭
 myconn.Close();

//删除他的借阅图书信息
 string strsql3="delete from bookjyxx where ISid='"+Tet_id.Text+"'";
 mycom = new SqlCommand(strsql3, myconn);
 myconn.Open();
 mycom.ExecuteNonQuery();
 //////////////////////////////
 //刷新信息
 //查询信息
 string strsql4= "select ISname as 借阅者,ISid as 借阅证号码,ISBookID as 借阅书籍编号,"
  + "ISBookname as 借阅数据名称,ISBookzt as 借阅状态,ISdate as借阅日期 from Bookjyxx where ISid='" + Tet_id.Text + "'";
 mydata = new SqlDataAdapter(strsql4, myconn);
 DataSet set = new DataSet();
 mydata.Fill(set);
 GridView1.DataSource = set.Tables[0];
 GridView1.DataBind();
 GridView1.Visible = true;
 //修改状态
 //先修改图书表状态信息
 string strsql7 = "update Bookxx set Bookzt='0' where BookID='" +tet_Bookid.Text+ "'";
 mycom = new SqlCommand(strsql7, myconn);
 mycom.ExecuteNonQuery();
 Response.Write("<script>alert('归还成功!')</script>");
 //关闭
 myconn.Close();
 set.Clear();