一个简单的用户登录界面和SQL连接了

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一个用户登录界面

using System;
using System.Data;
using System.Configuration;
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.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    SqlConnection sqlcon;
    SqlDataAdapter sqlDataAdapter;
    DataSet dataset;
    protected void Page_Load(object sender, EventArgs e)
    {
        //try
        //{
            sqlcon = new SqlConnection("server=.;Initial Catalog=UserInfo;Integrated Security=True");
        //}
        //catch (Exception ee)
        //{
            //lblMessage.Text = ee.Message.ToString();
        //}

    }
    protected void btnEnter_Click(object sender, EventArgs e)
    {
        try
        {
            sqlcon.Open();
            sqlDataAdapter = new SqlDataAdapter("select * from [User] where UserName='" + this.dropUserName.Text.ToString() + "'", sqlcon);
            dataset = new DataSet();
            sqlDataAdapter.Fill(dataset, "User");
            if (dataset.Tables["User"].Rows[0][1].ToString() == this.txtPassWord.Text.ToString())
            {
                lblMessage.Text = "登录成功！！！";
            }
            else
            {
                lblMessage.Text = "密码不正确！！！";
            }
        }
        catch (Exception ee)
        {
            lblMessage.Text = ee.Message.ToString();
        }
    }

}
SQL数据库

database:userInfo

表名：User

共两个字段：UserName varchar not null
Password varchar not null

有什么不会的给我留一定回答》