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control.Invalidate();                    

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Graphics x = this.CreateGraphics();
x.FillRectangle(Brushes.Red, xPos, yPos, xWidth, yHight);
// ...                    

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ExtendedGraphics extendedGraphics = new ExtendedGraphics(e.Graphics);
extendedGraphics.DrawRoundRectangle(...);                    

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private void pPanel_Paint(object sender, PaintEventArgs e)
{
    this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
    this.DoubleBuffered = true;

    e.Graphics.FillRectangle(Brushes.Black, xPosOben, yPosOben, 650, 20);
    e.Graphics.FillRectangle(Brushes.Black, xPosUnten, yPosUnten, 650, 20);
    e.Graphics.FillPie(Brushes.Green, LeftanglePosX, LeftanglePosY, LeftangleWidth, LeftangleHight, 90.0f, 180.0f);
    e.Graphics.FillPie(Brushes.Green, anglePosX, anglePosY, angleWidth, angleHight, -90.0f, 180.0f);
    e.Graphics.FillRectangle(Brushes.Green, xPos, yPos, xWidth, yHight);
}                    

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this.DoubleBuffered = true;                    

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    public partial class UserControl1 : Panel
    {
        public UserControl1(): base()
        {
            this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);

        }
    }                    

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        private void UserControl1_paint(object sender, PaintEventArgs e)
        {
            e.Graphics.FillRectangle(Brushes.Black, xPosOben, yPosOben, 650, 20);

            e.Graphics.FillRectangle(Brushes.Black, xPosUnten, yPosUnten, 650, 20);
            e.Graphics.FillPie(Brushes.Green, LeftanglePosX, LeftanglePosY, LeftangleWidth, LeftangleHight, 90.0f, 180.0f);
            e.Graphics.FillPie(Brushes.Green, anglePosX, anglePosY, angleWidth, angleHight, -90.0f, 180.0f);


            e.Graphics.FillRectangle(Brushes.Green, xPos, yPos, xWidth, yHight);


            lblStrokeValue.Text = angleHight.ToString();
        }                    

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e.Graphics.FillPie(Brushes.Green, anglePosX, anglePosY, angleWidth, angleHight, -90.0f, 180.0f);
e.Graphics.FillRectangle(Brushes.Green, xPos, yPos, xWidth, yHight);                    

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this.DoubleBuffered = true;                    

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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;
using System.Drawing.Extended;


namespace Pressen
{

    public partial class fForm : Form
    {

        public float xWidth;
        public float yHight;
        public float xPos;
        public float yPos;
        public float rRadius;
        public float angleWidth;
        public float angleHight;
        public float LeftangleWidth;
        public float LeftangleHight;
        public int xPosOben;
        public int yPosOben;
        public int xPosUnten;
        public int yPosUnten;
        public float anglePosX;
        public float anglePosY;
        public float LeftanglePosX;
        public float LeftanglePosY;
        public float Target;



        public fForm()
        {
            InitializeComponent();
        }

        private void fForm_Load(object sender, EventArgs e)
        {
            xWidth = 200.0f;
            yHight = 150.0f;
            angleWidth = 1.0f;
            angleHight = 151.0f;
            LeftangleWidth = 1.0f;
            LeftangleHight = 151.0f;
            xPos = 245.0f;
            yPos = 100.0f;
            xPosOben = 30;
            yPosOben = 80;
            xPosUnten = 30;
            yPosUnten = 250;
            anglePosX = 445.0f;
            anglePosY = 99.0f;
            LeftanglePosX = 245.0f;
            LeftanglePosY = 99.0f;
            Target = (float)Convert.ToDouble(txtTarget.Text);
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            tTimer.Enabled = true;
            txtTarget.ReadOnly = true;
        }

        private void tTimer_Tick(object sender, EventArgs e)
        {

            if (Target <= yHight)
            {

                // Verformtes Rechteck
                xPos -= 1.4f;
                yPos += 1.0f;
                xWidth += 3.0f;
                yHight -= 1.0f;
                
                // Verformtes Pie rechts
                angleWidth += 2.0f;
                angleHight -= 1.0f;
                anglePosY += 1.0f;
                anglePosX += 0.5f;

                // Verformtes Pie links
                LeftangleWidth += 2.0f;
                LeftangleHight -= 1.0f;
                LeftanglePosY += 1.0f;
                LeftanglePosX -= 2.3f;

                // Position Pressendes Rechteck
                yPosOben += 1;

                UserControl1.Invalidate();
            }
            else
            {
                tTimer.Enabled = false;
                txtTarget.ReadOnly = false;
                xWidth = 200.0f;
                yHight = 150.0f;
                angleWidth = 1.0f;
                angleHight = 151.0f;
                LeftangleWidth = 1.0f;
                LeftangleHight = 151.0f;
                xPos = 245.0f;
                yPos = 100.0f;
                xPosOben = 30;
                yPosOben = 80;
                xPosUnten = 30;
                yPosUnten = 250;
                anglePosX = 445.0f;
                anglePosY = 99.0f;
                LeftanglePosX = 245.0f;
                LeftanglePosY = 99.0f;
            }
            
        }

        private void btnStop_Click(object sender, EventArgs e)
        {
            tTimer.Enabled = false;
        }        

        private void txtTarget_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == Convert.ToChar(Keys.Return))
            {

                if (txtTarget.Text != "")
                {
                    try
                    {
                        Target = (float)Convert.ToDouble(txtTarget.Text);

                        if ((Target >= yHight) || (Target < 55.0))
                        {
                            Target = 60.0f;
                            txtTarget.Text = Convert.ToString(60);
                            MessageBox.Show("Target value not valid!!!");
                        }
                        else
                        {
                            MessageBox.Show("New Target set.");
                        }
                    }
                    catch
                    {
                        MessageBox.Show("Not a valid value");
                        Target = 60.0f;
                        txtTarget.Text = Convert.ToString(60);
                    }
                }
                else
                {
                    MessageBox.Show("Please input a number!");
                    Target = 60.0f;
                    txtTarget.Text = Convert.ToString(60);
                }
            }
        }

        private void UserControl1_paint(object sender, PaintEventArgs e)
        {           
            lblStrokeValue.Text = angleHight.ToString();
            e.Graphics.FillRectangle(Brushes.Black, xPosOben, yPosOben, 650, 20);
            e.Graphics.FillRectangle(Brushes.Black, xPosUnten, yPosUnten, 650, 20);
            e.Graphics.FillPie(Brushes.Green, anglePosX, anglePosY, angleWidth, angleHight, -90.0f, 180.0f);
            e.Graphics.FillPie(Brushes.Green, LeftanglePosX, LeftanglePosY, LeftangleWidth, LeftangleHight, 90.0f, 180.0f);
            e.Graphics.FillRectangle(Brushes.Green, xPos, yPos, xWidth, yHight);
        }
    }
}                    

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Pressen
{
    public partial class UserControl1 : Panel
    {

        public UserControl1(): base()
        {
            //this.DoubleBuffered = true;
            this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);
        }
    }
}                    

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this.DoubleBuffered = true;                    

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this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);                    

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e.Graphics.FillRectangle(Brushes.Gray, e.ClipRectangle.X, e.ClipRectangle.X, e.ClipRectangle.Width, e.ClipRectangle.Width);