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Exporting a datatable cause a problem in .NET

my codeline is:
Excel excel=new Excel();
int rowLength=excel.Worksheets["SHEETLOT"].Cells.MaxRow-excel.Worksheets["SHEETLOT"].Cells.MinRow+1;
DataTable table=excel.Worksheets["SHEETLOT"].Cells.ExportDataTable(0,0,373,4);
int tableLength=table.Rows.Count;
int a1=Convert.ToInt32(table.Rows[1][0]);
int a2=Convert.ToInt32(table.Rows[1][1]);
int a3=Convert.ToInt32(table.Rows[1][2]);

When the code run to the 4th line, it was interrupted by:
未处理的“System.ArgumentException”类型的异常出现在 中。

其他信息: System.FormatException: 输入字符串的格式不正确。
at System.Number.ParseDouble(String s, NumberStyles style, NumberFormatInfo info)
at System.Double.Parse(String s, NumberStyles style, IFormatProvider provider)
at System.Convert.ToDouble(String value, IFormatProvider provider)
at System.String.System.IConvertible.ToDouble(IFormatProvider provider)
at System.Convert.ToDouble(Object value)
at System.Data.Common.DoubleStorage.Set(Int32 record, Object value)
at System.Data.DataColumn.set_Item(Int32 record, Object value)不能在 Column3 列中存储 。所需类型是 Double。

but When I use DataTable table=excel.Worksheets["SHEETLOT"].Cells.ExportDataTable(0,0,372,4); it can run.

Is there anything wrong about my CSV files?
Thank you!

my file's cell value is type of int at row 1 colume 2, but it says:

未处理的“System.Exception”类型的异常出现在 aspose.excel.dll 中。

其他信息: Cell value type is string.

How is that happen, bug???

Please check