[C#] ระบบ Login C# ถ้าทำระบบ Login C# แล้วใช้ database ของ เวป host ได้มั้ยครับ ที่ชื่อว่า phpmyadmin

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Data;
using System.Data.OleDb;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    class AccessDatabase
    {
        private OleDbConnection AccessConnection;
        private OleDbCommand AccessCommand;

        private string AccessCommandString;

        public AccessDatabase()
        {
            string AccessConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "\\AccessDatabase.mdb";

            AccessConnection = new OleDbConnection(AccessConnectionString);
        }

        protected string CommandString
        {
            get { return AccessCommandString; }
            set 
            {
                AccessCommandString = value;
                AccessCommand = new OleDbCommand(AccessCommandString, AccessConnection);
            }
        }

        protected void AddParameter(string ParameterName, OleDbType ParameterType, object ParameterValue)
        {
            AccessCommand.Parameters.Add(ParameterName, ParameterType);
            AccessCommand.Parameters[ParameterName].Value = ParameterValue;
        }

        protected DataTable ExecuteQuery()
        {
            DataTable dataTable = new DataTable();

            try
            {
                OleDbDataAdapter AccessDataAdapter = new OleDbDataAdapter(AccessCommand);
                AccessDataAdapter.Fill(dataTable);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return null;
            }

            return dataTable;
        }

        protected object ExecuteScalar()
        {
            object Result = 0;

            try
            {
                AccessConnection.Open();
                Result = AccessCommand.ExecuteScalar();
                AccessConnection.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return 0;
            }

            return Result;
        }

        protected bool ExecuteNonQuery()
        {
            try
            {
                AccessConnection.Open();
                AccessCommand.ExecuteNonQuery();
                AccessConnection.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return false;
            }

            return true;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Data;
using System.Data.OleDb;

namespace WindowsFormsApplication1
{
    class TableUser : AccessDatabase
    {
        public bool AddNewUser(string UserName, string UserPassword, string UserEmail)
        {
            bool Success = false;

            if (!IsUser(UserName))
            {
                base.CommandString = "Insert Into [Table_User] ([UserName], [UserPassword], [UserEmail]) Values (@UserName, @UserPassword, @UserEmail)";
                base.AddParameter("@UserName", OleDbType.VarChar, UserName);
                base.AddParameter("@UserPassword", OleDbType.VarChar, UserPassword);
                base.AddParameter("@UserEmail", OleDbType.VarChar, UserEmail);

                Success = base.ExecuteNonQuery();
            }

            return Success;
        }

        private bool IsUser(string UserName)
        {
            bool HaveUser = false;

            base.CommandString = "Select Count(*) From [Table_User] Where [UserName]=@USerName";
            base.AddParameter("@UserName", OleDbType.VarChar, UserName);

            int User = (int)base.ExecuteScalar();

            if (User > 0)
                HaveUser = true;

            return HaveUser;
        }
    }
}