i want to display 1000000 records in a grid view at a time

Question

i want to display 1000000 records in a grid view at a time in one page ..so what i do it give out of memory exception

priya Avanigadda · Answer

Hii Akash SirU can do by using paging with dropdown then u can display 1000000 records in one page.But while loading it wil take time to display.

akash singh · Answer

wim acctly i want to export this grid view record into excel file... understand... so this is not an insane request

akash singh · Answer

what is code....

Manish Kumar Choudhary · Answer

Hi akash singh  If you can't fit your entire data set in memory then you need a buffering scheme. Rather than reading just the amount of data needed to fill the DataGridView in response to CellValueNeeded your application should anticipate the user's actions and read ahead. So for example when the program first starts up it should read the first 10000 records (or maybe only 1000 or perhaps 100000--whatever is reasonable in your case). Then CellValueNeeded requests can be filled immediately from memory. As the user moves through the grid your program as much as possible stays one step ahead of the user. There might be short pauses if the user jumps ahead of you (say wants to jump to the end from the front) and you have to go out to disk in order to fulfill a request. That buffering is usually best accomplished by a separate thread although synchronization can sometimes be an issue if the thread is reading ahead in anticipation of the user's next action and then the user does something completely unexpected like jump to the start of the list. 16 million records isn't really all that many records to keep in memory unless the records are very large. Or if you don't have much memory on your server. Certainly 16 million is nowhere near the maximum size of a List  unless T is a value type (structure). How many gigabytes of data are you talking about here?

Manish Kumar Choudhary · Answer

write simple select query

Wim Sturkenboom · Answer

As I said in your other thread you're requirement is insane. Nobody in his sane mind will scroll through 1 million records.