Please try this fix.
And if you update Aspose.Cells, you have to refere to Aspose.Cells for Net 2.Otherwise, you could not use Cells.ImportGridView method.
In this fix,we use Cell.GetStyle and SetStyle method replace the property of Cell.Style. The two methods will save more memory usage than cell.Style property.
If you want to set style of the cell, please change your codes as :
//Getting the style of the cell.
Style style = cell.GetStyle();
//Setting the property of the style.
//Setting the style of the cell