Using npoi export excel, is it have any resources to release, after the execution of the error, and the Exception capture failure, tip: because the code has been optimized, or the machine frame is located on the call stack, unable to calculate the value of the expression,

 
HttpResponse Response=HttpContext. Current. The Response; 
The Response. The Clear (); 
The Response. The ContentType="application/VND. Openxmlformats - officedocument. Spreadsheetml. Sheet". 
Response. AddHeader (" the Content - Disposition ", the string. Format (" attachment; Filename={0} ", excelName + ". XLSX ")); 

XSSFWorkbook workbook=new XSSFWorkbook (); 
ISheet sheet1=workbook. CreateSheet (" sheet1 "); 

//add the first line of the head to sheet1 title 
IRow row1=sheet1. CreateRow (0); 
for (int i=0; I & lt; DgDataGrid. Columns. The Count; I++) 
{
Row1. CreateCell (I). SetCellValue (dgDataGrid. Columns [I] the HeaderText); 
} 
for (int i=0; I & lt; DgDataGrid. Items. The Count; I++) 
{
NPOI. SS. UserModel. IRow rowtemp=sheet1. CreateRow (I + 1); 
For (int j=0; J & lt; DgDataGrid. Columns. The Count; J++) 
{
Rowtemp. CreateCell (j) SetCellValue (dgDataGrid. Items [I] Cells [j]. Journal of Text). 
} 
} 

//write to the client 
System. IO. MemoryStream ms=new System. IO. MemoryStream (); 
Workbook. Write (ms); 
The Response. BinaryWrite (Ms. ToArray ()); 
The Response. The Flush (); 
The Response. The End ();//step into The Times wrong