private void gridGrvList_MouseClick(object sender, MouseEventArgs e)
{
DataRow drv = gridviewGrvList.GetFocusedDataRow();
if (drv["ReceiptID"] != DBNull.Value)
{
int ReceiptID = Convert.ToInt32(drv["ReceiptID"]);
MovingAverage movingAverage = new MovingAverage();
movingAverage.DataSource = MovingAverageHistory.GetMovingAverageByReceiptID(ReceiptID);
movingAverage.CreateDocument();
PrintPreview.PrintingSystem = movingAverage.PrintingSystem;
}
}