admin/StudentInfo1.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_StudentInfo1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["admin"] == null && Session["teacher"] == null)
        {
            Response.Redirect("../Login.aspx");
        }
        if (!IsPostBack)
        {
            BindJiDi();
            BindList();

        }
    }
    private void BindList()
    {
        string sql = "select * from tb_Student where 1=1 ";

        if (txtKey.Text.Trim() != "")
        {
            sql += " and " + ddlType.SelectedValue + " like '%" + txtKey.Text.Trim() + "%' ";
        }
        if (QQQ.SelectedValue != "0")
        {
            sql += " and jidi='" + QQQ.SelectedValue + "'";
        }
        if (DropDownList5.SelectedValue != "0")
        {
            sql += " and kemu like '%" + DropDownList5.SelectedValue + "%'";
        }

        sql += " order by ID desc";
        DataTable dt = Exam.SqlHelper.ExecuteDataset(BaseClass.DBCon(), CommandType.Text, sql).Tables[0];
        if (dt != null && dt.Rows.Count > 0)
        {
            gvStuInfo.DataSource = dt;
            gvStuInfo.DataKeyNames = new string[] { "ID" };
            gvStuInfo.DataBind();
        }
        else
        {
            gvStuInfo.DataSource = null;
            gvStuInfo.DataBind();
        }
    }
    protected void btnserch_Click(object sender, EventArgs e)
    {
        BindList();