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Gridview get all records across pages


I have a data centric application with 1000s of records. I have a gridview retrieving data via an object data source with a page size of 500. There are times when a user wants to access all records across all gridview pages. I made a checkbox in gridview with a default checked, whenever user wants to carry out operations on multiple records (export to excel, add note etc) they just check all rows and perform action. What I realised recently however was that these operations don’t work across gridview pages. My code is as follows:

for (int i = 0; i < gvContacts.Rows.Count; i++)

                CheckBox cbSelectAll = (CheckBox)gvContacts.Rows[i].FindControl("cbSelectAll");

                if (cbSelectAll.Checked)
				//do some action if checked


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So the problem is not to access all records of gridview, the problem is to access all records checked across pages. How could I solve it? Please help.

2 Solutions
The advantage of using a paged datasource is that the other data will not be retrieved. The disadvantage is the same :-)

You have only the data for the visible 500 datarows available. If you need to execute operations on all datarows you need to retrieve the id's in the codebehind and store it in a hidden field or directly as javascript variable. If the "check all" is selected the operation needs to use this variable.

But be careful because this can lead to a poor performance if there are to much datarows.
oldtedtAuthor Commented:
isnt there a better way of achieving this?

I am trying to make the paging property of grindview false then bind the data, but problem with this method is the minute i bind data I lose all checked rows and since default is checked they all get checked.

Kamal KhaleefaInformation Security SpecialistCommented:
there is another method by storing all your data in a session and then bind the session to the grid view
now on each post back save/ update the session with the current values of the grid and the re bind

so by this u keep all the checks in the session
Ramkisan JagtapLead DeveloperCommented:
There is also an another way to do it, By storing the selected values of each page into a hidden field. and using them whenever you want.

oldtedtAuthor Commented:
Thanks for all your replies.
There is no straight forward way of achieving this as I was hoping. Even gmail select all button selects all on a page.
Session data was the way I was previously handled this entire grid, but the data is massive anywhere between 500 - 6000 records so I had to remove session variables. All the ways make the performance slower due to data size.

The way I have now tackled this problem is by having different buttons for each action eg.: export all and export selected. 'add note to selected' and 'add note to all'. there is no better way of solving this.
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