asp.net 数据库插入代码

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.OleDb;

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

}
protected void Button1_Click(object sender, EventArgs e)
{
string username = TextBox1.Text.ToString().Trim();
string password = TextBox2.Text.ToString().Trim();
string repaw = TextBox3.Text.ToString().Trim();
string sql = "select * from [user] where username = '" + username + "' ";

OleDbConnection conn = new OleDbConnection();
conn.ConnectionString = "Provider = Microsoft.Jet.OLEDB.4.0;Data Source= " + Server.MapPath("userinfo.mdb");
conn.Open();
string comm2 = "insert into [user] (username,password) VILUES ('" + username + "','" + password + "') ";
OleDbCommand comm = new OleDbCommand(sql, conn);
OleDbDataReader dr = comm.ExecuteReader();
if (username == "" | password == "")
{
Response.Write("账号,密码不能为空!");
}
else
{
if (repaw != password)
{
Response.Write("两次密码输入不匹配！");
}
else
{

if (dr.Read())
{
Response.Write("" + username + "这个用户名已被注册！");
}
else
{

OleDbCommand comm3 = new OleDbCommand(comm2, conn);
Response.Write("注册成功！！");
conn.Close();
}
}
}
}
}
在数据库插入数据时,最后能完成编译,但是没有结果,也就是数据库里没有插入数据进去!
代码如上!!本人分不多!!希望有朋友帮忙解决下!

答案：
else
{
OleDbCommand comm3 = new OleDbCommand(comm2, conn);
Response.Write("注册成功！！");
这里并没有执行加入操作

改为:
else
{
OleDbCommand comm3 = new OleDbCommand(comm2, conn);
comm3 .ExecuteNonQuery();
Response.Write("注册成功！！");
OleDbCommand comm = new OleDbCommand(comm2, conn);
验证怎么不做到界面上？有这样多的验证控件可以使用，还在代码区写这样多的东西？？？最奇怪的是，你怎么会在数据库执行以后才去验证呢？？才接触ASP.NET么？？？

看来看去，你这里出了问题：
OleDbDataReader dr = comm.ExecuteReader();
上面这句代码是查询数据的，不是更新数据的，没有抛出异常算不错了！
应该是：
int row = comm..ExecuteNonQuery();
才对~