数据库基础问题，ASP.NET中添加语句的错误

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.OleDb;
using System.Data;

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

}
protected void Button1_Click(object sender, EventArgs e)
{
    OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("app_data/student.mdb"));
    conn.Open();
    OleDbCommand mycmd = new OleDbCommand();
    string sql = "Insert Into User(Uname,Password,E-mail)Valuse('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox4.Text + "')";
    mycmd.CommandText = sql;
    mycmd.Connection = conn;
    bool dd = true;
    try
    {
        mycmd.ExecuteNonQuery();
    }
    catch
    {
        dd = false;
    }
    finally
    {
        mycmd.Dispose();
        conn.Close();
        conn.Dispose();
    }
    if (dd)
    {
        string strMessage;
        strMessage = "用户昵称：" + TextBox1.Text;
        strMessage = strMessage + "<br>密码：" + TextBox2.Text;
        strMessage = strMessage + "<br>确认密码：" + TextBox3.Text;
        strMessage = strMessage + "<br>电子邮箱：" + TextBox4.Text;
        Label1.Text = strMessage + "<br>" + TextBox1.Text + "，注册成功！";
    }
}
protected void Button2_Click(object sender, EventArgs e)
{
    TextBox1.Text = " ";
    TextBox2.Text = " ";
    TextBox3.Text = " ";
    TextBox4.Text = " ";
}

}

 string sql = "Insert Into User(Uname,Password,E-mail)Valuse('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox4.Text + "')";

他总是说我添加语句错误，可是我都是改了好几遍都还是这个错误。

Answer 1