Admin/AddStudent.aspx.cs

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using System;
using System.Data;
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;
using System.Data.SqlClient;
public partial class Admin_AddStudent : System.Web.UI.Page
{
    SqlHelper data = new SqlHelper();
    SqlConnection sqlconn = new SqlConnection(ConfigurationManager.ConnectionStrings["connStr"].ConnectionString);
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            sqlconn.Open();

            sqlconn.Close();
        }
    }
    protected void btnRegister_Click(object sender, EventArgs e)
    {
        string sqltest = "select * from tb_Member where MemberName='" + this.txtLoginName.Text + "'";
        sqlconn.Open();
        SqlCommand sqlcom = new SqlCommand(sqltest, sqlconn);
        SqlDataReader read = sqlcom.ExecuteReader();
        read.Read();
        if (read.HasRows)
        {
            if (this.txtLoginName.Text.Trim() == read["MemberName"].ToString().Trim())
            {
                Response.Write("<script language='javascript'>alert('已经存在了');localtion='AddStudent.aspx'</script>");
                return;
            }
        }
        string sqlstr = "insert into tb_Member "
            + "(MemberName,MemberPWD,MemberTName,MemberMoney)"
            + "values('" + txtLoginName.Text + "','" + txtPwd.Text + "','" + txtTName.Text + "','"+TextBox1.Text+"')";
        data.RunSql(sqlstr);
        sqlconn.Close();
        Alert.AlertAndRedirect("添加成功", "UserList.aspx");
     
    }
   
    protected void btnTest_Click(object sender, EventArgs e)
    {
        if (txtLoginName.Text == "")
        {

        }
        else
        {
            string sqlstr = "select * from tb_Member where MemberName='" + this.txtLoginName.Text + "'";
            sqlconn.Open();
            SqlCommand sqlcom = new SqlCommand(sqlstr, sqlconn);
            SqlDataReader read = sqlcom.ExecuteReader();