Help, I am using the newest version of Visual studio and this code has multiple

Question

Help, I am using the newest version of Visual studio and this code has multiple errors, I tried it as on the 17 3 example solution and that even errors out what am I missing?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Grades
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Grades());
        }
        public Partial class Form1 : Form
        {
            // Get the location where the data file would be created
            string fileLoc = Application.StartupPath +
            "\Datafile.txt";
            /* Constructor of the class to create the GUI of the form */
            public Form1()
            {
                InitializeComponent();
            }
            private void button1_Click(object sender, EventArgs e)
            {
                //form the desired string of the text boxes' text
                string stu_rec = txtLastName.Text + "," +
                txtFirstName.Text + ":" +
                txtIDNumber.Text + ""
                + txtClass.Text + "" + txtGrade.Text;
                try
                {
                    char TextBox;
                    //Create an Object of the SteamWriter
                    // class to write the data to the file
                    SteamWriter dat_file =
                    new SteamWriter(fileLoc, true);
                    //Write the data to the file
                    dat_file.WriteLine(stu_rec);
                    //clear the text of all the textbox controls
                    foreach (Control t in this.Controls)
                    {

                        if (t is TextBox)
                            t.Text = "";
                    }
                    //close the stream
                    dat_file.Close();
                }
                //throw an exception if the exception occurs
                catch (IOException)
                {
                    // show the error message
                    MessageBox.Show("Error Occurred. Please try again");
                }
                try
                {
                    //create a new object of the SteamReader class to read the data from the same file
                    SteamReaderread_file =
                    new SteamReader(fileLoc);
                    //variable to read the data
                    string read_rec = "";
                    //control where the data is to be shown
                    txtData.Text = "";
                    //read the data till the end of the file
                    do
                    {
                        //read the data and show it in the text box
                        read_rec = read_file.ReadLine();
                        txtData.Text += read_rec + " ";
                    }
                    while (read_rec != null);
                    //close the stream
                    read_file.Close();
                }
                //throw an exception if exception occurs
                catch (IOException)
                {
                    //show the message error
                    MessageBox.Show("Problem while reading the file. Please try again.");
                }
            }
        }//End class
    }
}

Explanation / Answer

In line number 76 I see the below statement

txtData.Text += read_rec + " ";

txtData.Text is actually textbox control for which you are adding read_rec+" "

I assume your aim is to add value of the txtdata.Text for which you have to take txtdata.Text.Value.
workaround for this is to assign it to a string variable and add then you can assign it to textbox, which is as below:

strData+= read_rec + " ";

txtData.Text.Value=strData;

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