c#_winforms_DEGREE_SIGN_FAIL.cs

/*
#!/usr/bin/mcs -r:System.Windows.Forms.dll -r:System.Drawing.dll

/usr/bin/mcs -debug+ -target:winexe -r:System.Windows.Forms.dll -r:System.Drawing.dll c#_winforms_base.cs
/usr/bin/mcs -debug+ -target:winexe -r:System.Windows.Forms.dll -r:System.Drawing.dll -codepage:65001 -langversion:Experimental -out:c#_winforms_base_1.exe  c#_winforms_base.cs
    Char    Dec     Hex     Entity  Name            URL
    °      176     00B0    °   DEGREE SIGN     https://www.w3schools.com/charsets/ref_utf_latin1_supplement.asp
    ℃     8451    2103    -       DEGREE CELSIUS  https://www.w3schools.com/charsets/ref_utf_letterlike.asp

*/

using System;
using System.Windows.Forms;
using System.Drawing;

public class Program
{
    static TextBox myTextBox;
    static Label myLabel;

    [STAThread]
    public static void Main()
    {
        try {

            var f = new Form();
            f.Text = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;
            f.Size = new Size(400, 300);

            myTextBox = new TextBox { Location = new Point(10, 20), Text = "-", Width = 365, Height = 200, Multiline = true, WordWrap = true, ScrollBars = ScrollBars.Both, Anchor = ( AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right ) };

            f.Controls.Add(myTextBox);
            myTextBox.TextChanged += new EventHandler (OnChange);

            myLabel = new Label { Location = new Point(10, 230), Text = "..." , Anchor = ( AnchorStyles.Bottom | AnchorStyles.Left ) };
            f.Controls.Add(myLabel);

            Application.Run(f);

        } catch (Exception e) {
            myLabel.Text = e.ToString();
        }
    }

    static private void OnChange (object sender, EventArgs e)
    {
        myLabel.Text = myTextBox.Text.Length.ToString();
    }

}