无法将类型“System.Data.SqlClient.SqlDataReader”隐式转换为“System.Data.SqlClient.SqlDataAdapter”

Question

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.Sql;
using System.Data.SqlClient;public partial class login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {    }
    protected void submit_Click(object sender, EventArgs e)
    {
        SqlConnection conn = new SqlConnection();
        conn.ConnectionString="server=localhost;database=news;integrated security=SSPI"; 
        conn.Open();
        SqlCommand cmd=new SqlCommand();
        cmd.CommandText="select username,psw from admin_user where username='"+this.tbuser.Text+"';";
        cmd.Connection=conn;
        SqlDataAdapter reader=cmd.ExecuteReader();
        ..........................
代码如上,提示"无法将类型“System.Data.SqlClient.SqlDataReader”隐式转换为“System.Data.SqlClient.SqlDataAdapter” "这是什么问题啊?

Answer 1

SqlDataAdapter reade
==>
SqlDataReader reade

Answer 2

SqlDataAdapter reader=cmd.ExecuteReader(); 
改为
SqlDataReader reader=cmd.ExecuteReader();

Answer 3

SqlDataAdapter reade 
== > 
SqlDataReader reade楼主多看看MSDN吧。