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Çë½ÌCharacter set 'gbk' is not supported
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C# code:

using System;
using System.Data;
using System.Configuration;
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;
using System.Configuration;
using MySql.Data.MySqlClient;

/// <summary>
///UserInfo µÄժҪ˵Ã÷
/// </summary>
public class UserInfo
{
public string user_name;
public string password;
public string str = System.Configuration.ConfigurationManager.AppSettings["strconn"];
MySqlConnection conn = new MySqlConnection();
MySqlCommand cmd = new MySqlCommand();
public string User_Name
{
get
{
return user_name;
}
set
{
user_name = value;
}
}
public string Password
{
get
{
return password;
}
set
{
password = value;
}
}
public bool CheckLogin()
{
conn = new MySqlConnection(str);
string sql = "select * from bg_user where username='" +user_name + "'and password='"+password+"'";