} expected when i use else or else if [on hold]

i am new to c# so be more specific when i go to code with if statment i always get an error on else/else if CS1513 } EXPECTED

       {
        {
            {
                string Username1231 = "S1L3nT";
                string Password1231 = "Munibf123";
                {
                    if (TextBox1.Text == "") ;
                    {
                        MessageBox.Show("Please Enter Password");
                    }
                } 

        else if (TextBox1.Text == Username1231) ;
            }
            MessageBox.Show("Good");
        }
    else
    {
            MessageBox.Show("Wrong Password");
        }
    }