How to change the back color of special dates in WinForms ScheduleControl?

//sets the color of prime time cells in the calendar.
this.scheduleControl1.Appearance.PrimeTimeCellColor = Color.FromArgb(0, Color.Wheat);
//sets the color of prime time cells in the calendar.
this.scheduleControl1.Appearance.NonPrimeTimeCellColor = Color.FromArgb(0, Color.Wheat);
this.scheduleControl1.GetScheduleHost().QueryCellInfo += new Syncfusion.Windows.Forms.Grid.GridQueryCellInfoEventHandler(Form1_QueryCellInfo);
void Form1_QueryCellInfo(object sender, Syncfusion.Windows.Forms.Grid.GridQueryCellInfoEventArgs e)
{
    if (e.ColIndex == 5)
    {
        //Applies back color for 5th column.
        e.Style.BackColor = Color.LightSkyBlue;
    }
    if (e.ColIndex == 6)
    {
        //Applies back color for 6th column.
        e.Style.BackColor = Color.Pink;
    }
}

'Sets the color of prime time cells in the calendar.
Me.scheduleControl1.Appearance.PrimeTimeCellColor = Color.FromArgb(0, Color.Wheat)
'Sets the color of Non-prime time cells in the calendar.
Me.scheduleControl1.Appearance.NonPrimeTimeCellColor = Color.FromArgb(0, Color.Wheat)
AddHandler scheduleControl1.GetScheduleHost().QueryCellInfo, AddressOf Form1_QueryCellInfo
void Form1_QueryCellInfo(Object sender, Syncfusion.Windows.Forms.Grid.GridQueryCellInfoEventArgs e)
   If e.ColIndex = 5 Then
       'Applies back color for 5th column.
       e.Style.BackColor = Color.LightSkyBlue
   End If
   If e.ColIndex = 6 Then
       'Applies back color for 6th column.
       e.Style.BackColor = Color.Pink
   End If
End Sub