Use of External Classes

[Daniel EXBN]

I have this code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using WindowsFormsApplication1;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void buttonClicked(object sender, EventArgs e)
        {
            Print PrintIT = new Print();
            PrintIT.PrintTo();
        }

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using WindowsFormsApplication1;

namespace WindowsFormsApplication1
{
    class Print : Form1
    {
        public void PrintTo()
        {
            richTextBox1.Text += "aaa";
        }
    }
}

I cannot figure out why "aaa" is not printed. Why is that?
No errors, all compiles fine.

Thanks!

[LittleDong]

I don't think you could build successfully.
I did like the following and it works.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
 

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Class1 a = new Class1();
            a.PrintTo(textBox1);
            
        }
    }
     
}

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

namespace WindowsFormsApplication1
{
    class Class1 :Form1
    {
         public void PrintTo(TextBox TBX)
     {
         TBX.Text += "aaa";
       }

    }
}

[Daniel EXBN]

I don't think you could build successfully.
I did like the following and it works.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
 

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Class1 a = new Class1();
            a.PrintTo(textBox1);
            
        }
    }
     
}

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

namespace WindowsFormsApplication1
{
    class Class1 :Form1
    {
         public void PrintTo(TextBox TBX)
     {
         TBX.Text += "aaa";
       }

    }
}

Thank You!!!!!!!!!!!! !