With theses codes I can print all the textboxes content without problems.
Then what can I do if I would like to print for example a specific texbox or some textboxes (not all for instance).
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            e.Graphics.DrawString(textBox1.Text, textBox1.Font, Brushes.Black, 50, 20);
            e.Graphics.DrawString(textBox2.Text, textBox2.Font, Brushes.Black, 50, 50);
            e.Graphics.PageUnit = GraphicsUnit.Inch;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            printDialog1.Document = printDocument1;
            if (printDialog1.ShowDialog() == DialogResult.OK)
            {
                printDocument1.Print();
            }
        private void Printpreview_Click(object sender, EventArgs e)
        {
            printPreviewDialog1.Document = printDocument1;
            printPreviewDialog1.ShowDialog();
            
        }