Left.ascx.cs

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using System;
	using System.Data;
	using System.Drawing;
	using System.Web;
	using System.Web.UI.WebControls;
	using System.Web.UI.HtmlControls;

public partial class Left : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, System.EventArgs e)
    {
        Panel1.Visible = false;
        Panel2.Visible = false;
        if (Session["name"] != null)
        {
            Label1.Text = Session["name"].ToString();
            Panel2.Visible = true;
        }
        else
            Panel1.Visible = true;

    }
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        string sql;
        sql = "SELECT * FROM tUser WHERE username='" + username.Text + "' AND userpassword = '" + userpass.Text + "'";
        DataTable dt = MyDB.GetDataTable(sql);
        if (dt.Rows.Count == 0)
        {
            Response.Write("<script>alert(\"用户名不存在或密码错误，请确认后再登录！\");</script>");
        }
        else
        {
            Session["name"] = username.Text;
            Response.Write("<script>alert(\"登录成功！\");</script>");
            Label1.Text = "<b>" + Session["name"].ToString() + "</b>";
            Panel1.Visible = false;
            Panel2.Visible = true;
        }
    }

    protected void Button2_Click(object sender, System.EventArgs e)
    {
        Response.Redirect("Reg.aspx");
    }
   
}