How To Find The Caret Position In A TextBox Using C#?

Question

I have some TextBox, MultiLine TextBox, RichTextBox in my WindowsFormApps using Visual Studio 2015. Now I want to let my user type text in these fields and along with I want to know the Caret Pointer position (X-Axis,Y-Axis) continuously whether my user type text in the end of text or in start of the text or any where in the middle of the text.

Can I get the correct position (X-Axis,Y-Axis) at Run Time continuously in some class level variables to use it on other places...???

CODE ADDED:

    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 DEMO_Apps
    {
        public partial class MainForm : Form
        {
            int xpos;
            int ypos;
            public MainForm()
            {
                InitializeComponent();
            }
            private void textBox1_TextChanged(object sender, EventArgs e)
            {
                var o = Utility.GetCaretPoint(textBox1);
                xpos = o.X;
                ypos = o.Y;
                textBox2.Text = Convert.ToString(xpos + "," +  ypos);                
            }     
        }

        public static class Utility
        {
            ///for System.Windows.Forms.TextBox
            public static System.Drawing.Point GetCaretPoint(System.Windows.Forms.TextBox textBox)
            {
                return textBox.GetPositionFromCharIndex(textBox.SelectionStart);
            }

            ///for System.Windows.Controls.TextBox
            public static System.Windows.Point GetCaretPoint(System.Windows.Controls.TextBox textBox)
            {
                return textBox.GetRectFromCharacterIndex(textBox.SelectionStart).Location;
            }
        }
    }

Answer 1

Based on your edited question, I checked the code and found that when caret is at last character, the function gives empty position so I changed a bit, the following Functions should give you what you want:

 namespace DEMO_Apps
{
    public partial class MainForm : Form
    {
        int xpos;
        int ypos;
        public MainForm()
        {
            InitializeComponent();
        }
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            var o = Utility.GetCaretPoint(textBox1);
            xpos = o.X;
            ypos = o.Y;
            textBox2.Text = Convert.ToString(xpos + "," +  ypos);                
        }     
    }

    public static class Utility
    {
        ///for System.Windows.Forms.TextBox
        public static System.Drawing.Point GetCaretPoint(System.Windows.Forms.TextBox textBox)
        {
            int start = textBox.SelectionStart;
            if (start == textBox.TextLength)
            start --;

            return textBox.GetPositionFromCharIndex(start);
        }

        ///for System.Windows.Controls.TextBox requires reference to the following dlls: PresentationFramework, PresentationCore & WindowBase.
        //So if not using those dlls you should comment the code below:

        public static System.Windows.Point GetCaretPoint(System.Windows.Controls.TextBox textBox)
        {
            return textBox.GetRectFromCharacterIndex(textBox.SelectionStart).Location;
        }
    }
}