login.aspx.cs

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using System;
using System.Data;

public partial class login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        DBClass db1 = new DBClass();
        string strsql = "select * from register where username='" + TextBox1.Text + "' and password='" + TextBox2.Text + "'";
        DataTable dt = db1.GetRecords(strsql);
        if (dt != null && dt.Rows.Count == 1)  //登录成功
        {
            Session["username"] = TextBox1.Text;
            Session["userid"] = dt.Rows[0]["id"].ToString();

            Response.Redirect("Gbook.aspx?cid=1&uid=" + Session["userid"]);

        }
        else
        {
            Response.Write("<script languge='javascript'>alert('无法登录,用户名或密码错误!'); window.location.href='login.aspx'</script>");
        }
    }
}