CircularProgressBar circularProgressBar = new CircularProgressBar();

        public RadForm1()
        {
            InitializeComponent();
            new RadControlSpyForm().Show();
            ThemeResolutionService.ApplicationThemeName = "Fluent";
           
            circularProgressBar.Size = new Size(100, 100);
            circularProgressBar.Location = new Point(10, 10);
            circularProgressBar.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Top;
            this.Controls.Add(circularProgressBar);
         
            circularProgressBar.ProgressColor = Color.Lime;
            circularProgressBar.ProgressColor2 = Color.Red;  
            circularProgressBar.ProgressValue = 50;
        }

        public class CircularProgressBar : RadWaitingBar
        {
            private decimal _value;
            private Color _color;
            private Color _color2;

            public Color ProgressColor2
            {
                get
                {
                    return this._color2;
                }
                set
                {
                    this._color2 = value;
                }
            }

            public override string ThemeClassName
            {
                get
                {
                    return typeof(RadWaitingBar).FullName;
                }
            }

            protected override RadWaitingBarElement CreateWaitingBarElement()
            {
                RadWaitingBarElement waitingElement = base.CreateWaitingBarElement();
                waitingElement.WaitingStyle = Telerik.WinControls.Enumerations.WaitingBarStyles.RotatingRings;
                RotatingRingsWaitingBarIndicatorElement indicator = waitingElement.ContentElement.WaitingIndicators[0] as RotatingRingsWaitingBarIndicatorElement;
                this._color = Color.Blue;
                waitingElement.Text = "0 %";
            
                indicator.InitialStartElementAngle = 90;
                indicator.InnerRingSweepAngle = 360;
                indicator.InnerRingStartAngle = 0;

                return waitingElement;
            }

            public decimal ProgressValue
            {
                get
                {
                    return this._value;
                }

                set
                {
                    _value = value;
                    RotatingRingsWaitingBarIndicatorElement indicator =
                        this.WaitingBarElement.ContentElement.WaitingIndicators[0] as RotatingRingsWaitingBarIndicatorElement;
                    this.WaitingBarElement.Text = value + "%";
                    indicator.InnerRingStartAngle = 0;
                    indicator.InnerRingSweepAngle = (int)ConvertProgressValueToAngle(value);
                    indicator.OuterRingSweepAngle = 360;
                    UpdateVisualStyles();
                }
            }

            public Color ProgressColor
            {
                get
                {
                    return _color;
                }
                set
                {
                    this._color = value;
                    RotatingRingsWaitingBarIndicatorElement indicator =
                        this.WaitingBarElement.ContentElement.WaitingIndicators[0] as RotatingRingsWaitingBarIndicatorElement;
                    indicator.ElementColor = this.ProgressColor;
                    indicator.ElementColor2 = this.ProgressColor;
                }
            }

            private void UpdateVisualStyles()
            {
                RotatingRingsWaitingBarIndicatorElement indicator =
                    this.WaitingBarElement.ContentElement.WaitingIndicators[0] as RotatingRingsWaitingBarIndicatorElement;
                indicator.ElementColor = this.ProgressColor;
                indicator.InnerRingBackgroundColor = this.ProgressColor2;
                indicator.ElementNumberOfColors = 1;
                indicator.GradientStyle = Telerik.WinControls.GradientStyles.Solid;
                indicator.InnerRadius = this.Width / 4 + 10;
                indicator.Radius = this.Width / 4 + 10;
                indicator.InnerRingWidth = 5;
                indicator.OuterRingWidth = 5;
            }

            private decimal ConvertProgressValueToAngle(decimal value)
            {
                decimal angleValue = 0;
                angleValue = value * 360 / 100;
                return angleValue;
            }
        }