How to write a loading circle animation in .NET?

private PointF GetCoordinate(PointF _objCircleCenter, int _intRadius, double _dblAngle)
{
    _dblAngle = _dblAngle - 90D;
    double dblAngle = Math.PI * _dblAngle / NumberOfDegreesInHalfCircle;

    return new PointF(_objCircleCenter.X + _intRadius * (float)Math.Cos(dblAngle),
                      _objCircleCenter.Y + _intRadius * (float)Math.Sin(dblAngle));
}

this.loadingCircleToolStripMenuItem1.LoadingCircleControl.Active = true;

[...]<br />
using(Pen objPen = new Pen(new SolidBrush(_objColor), _intLineThickness))<br />
[...].

[...]<br />
using(SolidBrush brush = new SolidBrush(_objColor))<br />
{<br />
    using (Pen objPen = new Pen(brush, _intLineThickness))<br />
    {<br />
[...].

<br />
<br />
/////////////////////////////////LoadingCircleCell////////////////////////////////<br />
internal class LoadingCircleCell : DataGridViewCell<br />
    {<br />
        private Type validatingType;<br />
<br />
        public LoadingCircleCell() : base()<br />
        {<br />
            validatingType = typeof (LoadingCircle);<br />
        }<br />
<br />
        public override Type EditType<br />
        {<br />
            get { return typeof (LoadingCircleEditingControl); }<br />
        }<br />
<br />
        //  A Type object for the validating type.<br />
        public override Type ValueType<br />
        {<br />
            get { return typeof (LoadingCircle); }<br />
        }<br />
<br />
        public override object DefaultNewRowValue<br />
        {<br />
            get<br />
            {<br />
                // add a new loading circle<br />
                return new LoadingCircle();<br />
            }<br />
        }<br />
<br />
        public override void InitializeEditingControl(int rowIndex,<br />
                                                      object initialFormattedValue,<br />
                                                      DataGridViewCellStyle dataGridViewCellStyle)<br />
        {<br />
            base.InitializeEditingControl(rowIndex, initialFormattedValue,<br />
                                          dataGridViewCellStyle);<br />
<br />
            LoadingCircleEditingControl editingControl = DataGridView.EditingControl as LoadingCircleEditingControl;<br />
            if (editingControl != null)<br />
                editingControl.Active = (bool) Value;<br />
        }<br />
    }<br />
<br />
<br />
/////////////////////////////////LoadingCircleEditingControl////////////////////////////////<br />
public class LoadingCircleEditingControl: LoadingCircle, IDataGridViewEditingControl<br />
    {<br />
        protected int rowIndex;<br />
        protected DataGridView dataGridView;<br />
        protected bool valueChanged = false;<br />
<br />
        protected override void OnTextChanged(EventArgs e)<br />
        {<br />
            base.OnTextChanged(e);<br />
            // Let the DataGridView know about the value change<br />
            NotifyDataGridViewOfValueChange();<br />
        }<br />
<br />
        //  Notify DataGridView that the value has changed.<br />
        protected virtual void NotifyDataGridViewOfValueChange()<br />
        {<br />
            this.valueChanged = true;<br />
            if (this.dataGridView != null)<br />
            {<br />
                this.dataGridView.NotifyCurrentCellDirty(true);<br />
            }<br />
        }<br />
<br />
        #region IDataGridViewEditingControl Members<br />
<br />
        //  Indicates the cursor that should be shown when the user hovers their<br />
        //  mouse over this cell when the editing control is shown.<br />
        public Cursor EditingPanelCursor<br />
        {<br />
            get<br />
            {<br />
                return base.Cursor;<br />
            }<br />
        }<br />
<br />
<br />
        //  Returns or sets the parent DataGridView.<br />
        public DataGridView EditingControlDataGridView<br />
        {<br />
            get<br />
            {<br />
                return this.dataGridView;<br />
            }<br />
<br />
            set<br />
            {<br />
                this.dataGridView = value;<br />
            }<br />
        }<br />
<br />
<br />
        //  Sets/Gets the formatted value contents of this cell.<br />
        public object EditingControlFormattedValue<br />
        {<br />
            set<br />
            {<br />
                this.Active = (bool)value;<br />
                NotifyDataGridViewOfValueChange();<br />
            }<br />
            get <br />
            {<br />
                return this.Active;<br />
            }<br />
<br />
        }<br />
<br />
        //   Get the value of the editing control for formatting.<br />
        public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)<br />
        {<br />
            return EditingControlFormattedValue;<br />
        }<br />
<br />
        //  Process input key and determine if the key should be used for the editing control<br />
        //  or allowed to be processed by the grid. Handle cursor movement keys for the MaskedTextBox<br />
        //  control; otherwise if the DataGridView doesn't want the input key then let the editing control handle it.<br />
        public bool EditingControlWantsInputKey(Keys keyData, bool dataGridViewWantsInputKey)<br />
        {<br />
            switch (keyData & Keys.KeyCode)<br />
            {<br />
                case Keys.Right:<br />
                    <br />
                    break;<br />
<br />
                case Keys.Left:<br />
                    <br />
                    break;<br />
<br />
                case Keys.Home:<br />
                case Keys.End:<br />
                    <br />
<br />
                case Keys.Prior:<br />
                case Keys.Next:<br />
                    if (this.valueChanged)<br />
                    {<br />
                        return true;<br />
                    }<br />
                    break;<br />
<br />
                case Keys.Delete:<br />
                    <br />
                    break;<br />
            }<br />
<br />
            //<br />
            // defer to the DataGridView and see if it wants it.<br />
            //<br />
            return !dataGridViewWantsInputKey;<br />
        }<br />
<br />
<br />
        //  Prepare the editing control for edit.<br />
        public void PrepareEditingControlForEdit(bool selectAll)<br />
        {<br />
<br />
        }<br />
<br />
        //  Indicates whether or not the parent DataGridView control should<br />
        //  reposition the editing control every time value change is indicated.<br />
        //  There is no need to do this for the MaskedTextBox.<br />
        public bool RepositionEditingControlOnValueChange<br />
        {<br />
            get<br />
            {<br />
                return false;<br />
            }<br />
        }<br />
<br />
<br />
        //  Indicates the row index of this cell.  This is often -1 for the<br />
        //  template cell, but for other cells, might actually have a value<br />
        //  greater than or equal to zero.<br />
        public int EditingControlRowIndex<br />
        {<br />
            get<br />
            {<br />
                return this.rowIndex;<br />
            }<br />
<br />
            set<br />
            {<br />
                this.rowIndex = value;<br />
            }<br />
        }<br />
<br />
<br />
<br />
        //  Make the MaskedTextBox control match the style and colors of<br />
        //  the host DataGridView control and other editing controls <br />
        //  before showing the editing control.<br />
        public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)<br />
        {<br />
            this.Font = dataGridViewCellStyle.Font;<br />
            this.ForeColor = dataGridViewCellStyle.ForeColor;<br />
            this.BackColor = dataGridViewCellStyle.BackColor;<br />
            //this.TextAlign = translateAlignment(dataGridViewCellStyle.Alignment);<br />
        }<br />
<br />
<br />
        //  Gets or sets our flag indicating whether the value has changed.<br />
        public bool EditingControlValueChanged<br />
        {<br />
            get<br />
            {<br />
                return valueChanged;<br />
            }<br />
<br />
            set<br />
            {<br />
                this.valueChanged = value;<br />
            }<br />
        }<br />
    <br />
        #endregion // IDataGridViewEditingControl.<br />
	}<br />
<br />
<br />
/////////////////////////////////LoadingCircleColumn ////////////////////////////////<br />
public class LoadingCircleColumn : DataGridViewColumn<br />
    {<br />
        <br />
        //  Initializes a new instance of this class, making sure to pass<br />
        //  to its base constructor an instance of a MaskedTextBoxCell <br />
        //  class to use as the basic template.<br />
        public LoadingCircleColumn() : base(new LoadingCircleCell())<br />
        {<br />
        }<br />
<br />
        //  The template cell that will be used for this column by default,<br />
        //  unless a specific cell is set for a particular row.<br />
        //<br />
        //  A MaskedTextBoxCell cell which will serve as the template cell<br />
        //  for this column.<br />
        public override DataGridViewCell CellTemplate<br />
        {<br />
            get { return base.CellTemplate; }<br />
<br />
            set<br />
            {<br />
                //  Only cell types that derive from MaskedTextBoxCell are supported as the cell template.<br />
                if (value != null && !value.GetType().IsAssignableFrom(typeof (LoadingCircleCell)))<br />
                {<br />
                    string s = "Cell type is not based upon the LoadingCircleCell.";<br />
                    //CustomColumnMain.GetResourceManager().GetString("excNotMaskedTextBox");<br />
                    throw new InvalidCastException(s);<br />
                }<br />
<br />
                base.CellTemplate = value;<br />
            }<br />
        }<br />
    }<br />