public string GetUserIdByName(string UserName, string pwd)
{
string sql = @"select Namess from testlogin where UserName=@name and PWD=@PWD";
MySqlConnection coon = new MySqlConnection(MySql);
coon.Open();
MySqlCommand cmd = new MySqlCommand(sql, coon);
MySqlParameter sp;
sp = new MySqlParameter("@name", UserName);
cmd.Parameters.Add(sp);
sp = new MySqlParameter("@PWD", pwd);
cmd.Parameters.Add(sp);
string result = cmd.ExecuteScalar().ToString();
return result;
}