How to create a field as a password textbox in curved shape textbox

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C#

Thanks in advance!!!...I am using Curved Textbox for Username and Password..It is good for username but Password I need to show as * format....In this textbox property doesnot contain Passwordchar at all....Pls help...

What I have tried:

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RoundTextBox
{
    internal class MyRectangle
    {
        private Point Location;
        private float radius;
        private GraphicsPath gtpath;
        private float x;
        private float y;
        private float width;
        private float height;

        public MyRectangle() { }
        public MyRectangle(float width,float height,float radius,float x=0f,float y=0f)
        {
            this.Location = new Point(0, 0);
            this.radius = radius;
            this.x = x;
            this.y = y;
            this.height = height;
            this.width = width;
            this.gtpath = new GraphicsPath();
            if(radius<=0f)
            {
                this.gtpath.AddRectangle(new RectangleF(x, y, width, height));

            }
            else
            {
                RectangleF ef = new RectangleF(x, y, 2f * radius, 2f * radius);
                RectangleF ef2 = new RectangleF((width - (2f * radius))-1f ,x, 2f * radius, 2f * radius);
                RectangleF ef3 = new RectangleF(x, (height - (2f * radius)) - 1f, 2f * radius, 2f * radius);
                RectangleF ef4 = new RectangleF((width - (2f * radius)) - 1f, (height - (2f * radius)) - 1f, 2f * radius, 2f * radius);

                this.gtpath.AddArc(ef, 180f, 90f);
                this.gtpath.AddArc(ef2, 270f, 90f);
                this.gtpath.AddArc(ef4, 0f, 90f);
                this.gtpath.AddArc(ef3, 90f, 90f);
                this.gtpath.CloseAllFigures();


            }

        }

       public GraphicsPath path =>
            this.gtpath;
        public RectangleF rect =>
            new RectangleF(this.x, this.y, this.width, this.height);
        public float Radius
        {
            get => this.radius;
            set =>
                this.radius = value;

        }
    }
}