Add event by clicking button design of axml in monodroid?
public class Activity1 : Activity
{
     string dbPath = System.IO.Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "tdsl_validation.sqlite");



        private Button login_button;
        private EditText  user;
        private EditText passs;






    protected override void OnCreate(Bundle bundle)
    {
        var ss=dbPath;

         base.OnCreate(bundle);
         user = (EditText)FindViewById(Resource.Id.editText1);
         passs = (EditText)FindViewById(Resource.Id.editText3);
         login_button = (Button)FindViewById(Resource.Id.button1);
         login_button.Click += new EventHandler(button1_Click);
         SetContentView(Resource.Layout.Main);


    }


    private  bool validate_user(string username, string password)
    {
        bool i;
        i = true;
        string str;

        DataTable dt = new DataTable();
        string dbPath1 = System.IO.Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "tdsl_validation.sqlite");

        SqliteConnection con = new SqliteConnection("Data Source="+ dbPath1);
        str = "select pass from user_detail where user_name='" + username + "' and pass='" + password + "'";
        SqliteCommand cmd = new SqliteCommand(str, con);
        SqliteDataAdapter da = new SqliteDataAdapter(cmd);
        da.Fill(dt);


        if (dt != null)
        {
            if (dt.Rows.Count > 0)
            {
                i = true;

            }
            else
            {
                i = false;
            }

        }
        else
        {
            i = false;
        }

        return i;

    }





    void button1_Click(object sender, EventArgs e)
    {
        bool i;
         user = (EditText)FindViewById(Resource.Id.editText1);
         passs = (EditText)FindViewById(Resource.Id.editText3);
         i = validate_user(user.Text, passs.Text);

         i = validate_user(user.Text, passs.Text);
         if (i == true)
         {

         }
         else
         {
             Toast.MakeText(this, "Invalid Username or Password", ToastLength.Short).Show();
         }



        // stuff here
    }








}

SetContentView(Resource.Layout.Main);

Button button = FindViewById<Button>(Resource.Id.MyButton);

button.Click += delegate {
    // handle the click event here
};

button.Click += ButtonClicked;

private void ButtonClicked(object sender, EventArgs eventArgs)
{
    // handle button click here
}