江湖救急啊~今天要交！！麻烦各位帮下小忙，真是急死了。。
第2个if语句中老是不执行，就跳到ELSE中，如果不要第二个if语句旧能进聊天室，可是这样竟不去管理页面，要的话，点进入聊天室按钮一直就像在刷屏，悲催的一直在登陆页面~真是2012.6.18要交啊。。帮帮学生妹子吧！！大侠们~[color=#FF0000][/color]
using System;
using System.Configuration;
using System.Data;
using System.Data.OleDb;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)
{
this.Title = "请登录";
UserName.Focus();
}

protected void UserLogin_Click(object sender, EventArgs e)
{
if (UserName.Text == "" || Password.Text == "")
{
Response.Write("<script language=javascript>alert('请输入完整的登录信息！');</script>");
return;
}

using (OleDbConnection con = new OleDbConnection(ConfigurationManager.ConnectionStrings["db1ConnectionString"].ToString()))
try
{
con.Open();
string sql = "select * from tbUser where Username='" + UserName.Text + "'and Password='" + Password.Text + "'";
OleDbCommand cmd = new OleDbCommand(sql, con);
using (OleDbDataReader re = cmd.ExecuteReader())
{
string name = string.Empty;
string pwd = string.Empty;
string nick = string.Empty;
Int32 power = 0;
while (re.Read())
{
Session["name"] = re["Username"].ToString();
Session["nick"] = re["Nick"].ToString();
Session["pwd"] = re["Password"].ToString();
Session["power "] = Int32.Parse(re["Power"].ToString());
}

if (name.Trim() == UserName.Text.Trim() && pwd.Trim() == Password.Text.Trim())
{
if (power == 1) //power == 1，管理员登陆；为0为普通用户登陆
{
Response.Redirect("../聊天室/admin/main.aspx");
}

else
{
Response.Redirect("../聊天室/chat.htm");
}
} }
}
catch (Exception ex)
{
throw;
}
}
protected void NewUser_Click(object sender, EventArgs e)
{
Response.Redirect("../聊天室/zhuce.aspx");
}

}

[解决办法]
大侠都很忙的，只有我这种小菜才有时间的。。。
这样改下

C# code

using System;using System.Collections;using System.Configuration;using System.Data;using System.Data.OleDb;using System.Linq;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Xml.Linq;public partial class Default2 : System.Web.UI.Page{    static bool Passcheck=false;    void CheckUserName()    {        OleDbConnection con = new OleDbConnection(ConfigurationManager.ConnectionStrings["db1ConnectionString"].ToString());        con.Open();        string sql = "select * from tbUser where Username='" + UserName.Text + "'";        OleDbCommand cmd = new OleDbCommand(sql, con);        OleDbDataReader re = cmd.ExecuteReader();        if (re.Read())        {            Passcheck = false;        }        else        {            Passcheck = true;        }        re.Close();        con.Close();    }    protected void Page_Load(object sender, EventArgs e)    {        this.Title = "新用户注册";    }    protected void zhuce_Click(object sender, EventArgs e)    {        //先调用下CheckUserName方法        this.CheckUserName();        if (Passcheck)        {            OleDbConnection con = new OleDbConnection(ConfigurationManager.ConnectionStrings["db1ConnectionString"].ToString());            string val = "'" + UserName.Text + "','" + "'" + Pass1.Text + "','" + "'" + Nick.Text + "'";            string sql = "insert into tbUser(UserName,Password,Nick)values(" + val + ")";            OleDbCommand cmd = new OleDbCommand(sql, con);            con.Open();            int result = cmd.ExecuteNonQuery(); //这里有问题。。            if (result > 0)            {                Response.Write("<script language=javascript>alert('注册成功，请单击“返回”进入登录页面');</script>");            }            else            {                Response.Write("<script language=javascript>alert('注册失败，请重新注册');</script>");            }        }        else        {            Response.Write("<script language=javascript>alert('用户名已被占用，请选择其他名称！')</script>");        }            }    protected void Return_Click(object sender, EventArgs e)    {        Response.Redirect("../聊天室/Default.aspx");    }}