public static double ColumnsUsedWidth(this ExcelWorksheet ws)
{
double w = 0;
for (var i = 1; i <= ws.ColumnCount(); i++)
{
w += ws.Column(i).Width;
}
return(w);
}
public static ExcelRange UsedRange(this ExcelWorksheet ws) => ws.Cells[1, 1, ws.RowCount(), ws.ColumnCount()];