I've got a Gridview that's populated by a Search button and I'm not sure how to go about doing custom paging for it. I run the search query using sp_executeSQL right now and it returns the entire resultset.
I'd like to know what steps I should take to set up custom paging and sorting on the GridView and the most efficient way to modify a procedure that uses Sp_ExecuteSQL to generate a result that's a single page. I've seen methods that use a temporary table, etc.
Once I have the proc written, how do I set up the events in the page?
asp:gridview comes with a paging setup if you didn't know that has sorting and paging with a certain number of fields techniques that are found http://www.dotnetspider.com/resources/1249-Grid-View-Paging-Sorting.aspx
But if you want to come up with your own paging technique which sounds like paging or sorting in the Database then this is different from paging in memory, which is what the asp:gridview webcontrol does. So if you want to page and sort from DB then you should create a stored procedure that does this and when it comes to your search button call that procedure which will take in your specific paramters(page number, how many entries per page,etc..)
This site https://web.archive.org/web/20210510021915/http://aspnet.4guysfromrolla.com/articles/031506-1.aspx goes much in detail on how better paging and sorting is if down from the DB
Related
Which control should I use to show post records from my database in ASP.NET?
On my project page I would like to show recently featured projects. The number of projects can vary. I'm looking for a control like GridView or something that alter the properties of accordingly to get data from my database.
Below is an image of what I would like my page to look like:
I have been told to use asp:ListView but I don't know how to use it. Is this the right solution for my problem?
You could use a GridView Class
Displays the values of a data source in a table where each column
represents a field and each row represents a record. The GridView
control enables you to select, sort, and edit these items.
Or a Repeater Class
A data-bound list control that allows custom layout by repeating a
specified template for each item displayed in the list.
I have a bit of a unique problem. I am using a GridView to display information from a database. The requirements for this GridView are that it is always editable so I have TextBoxes in the ItemTemplates and want to save the values when a button is clicked.
That all works great.
The problem is I am trying to get sorting (and eventually paging) working and hitting problems. If I bind the GridView from an ObjectDataSource this obviously doesn't work because it rebinds the datasource before it sorts and I lose any modified values. If I bind the GridView from a DataTable and try to store it in a Session variable it still doesn't work because any modified values aren't in the session variable.
I'm really just looking for suggestions on what I could possibly do to sort (and page later) without losing values the user has modified. I realize most people don't modify the Gridview all at once so its a weird problem.
You could implement client-side sorting of the GridView which would have the added benefit of making your UI feel faster. There is a blog post on sorting with jQuery you could try, though I have not personally used the method suggested.
Alternatively, you could send the values back to the server via AJAX while editing and save them (temporarily) in the session, the database, or where it makes the post sense in your scenario. You would obviously need to retrieve them when sorting.
One final option would be to save your values on the postback caused by the sort command. Mostly you would do something along the lines of handling the OnTextChanged event of the TextBoxes and (as above) saving the values to a temporary store. You would not want these TextBoxes to autopostback - they would simply wait for a postback such as the one caused by your sorting event. In this scenario you could also use the temporary store you populate during the save event to avoid duplicating the effort.
I have an ASP.NET page with a Wizard control containing several steps and about 80 form fields. The data is collected and inserted to a database from the code behind page. I need to set this form up so you can not only insert, but edit a record as well. So I want to databind the fields. I'd rather not use a FormView because then I would have to revise my existing code, since you can't access controls inside a FormView directly. Is there a way to databind the fields without using a FormView? I'm new at this by the way so sorry if the answer should be obvious.
A wizard is just a UI control with many steps in it. You can use it to insert, edit, delete or anything else you can think of. You can have an INSERT wizard and an EDIT wizard. The difference would be that there would be two of them and that the code behind for each one (presumably on the CompletedStep) would have slightly different code to persist the data. The insert wizard would call an insert database query and the edit one would call an update query.
That being said, you can access the control inside a FormView, I'm not sure why you said that you can't access controls indie a FormView. You can. See Using FindControl: Accessing Controls in a Formview.
You could even put the two wizards inside the two states of the formview - InsertTemplate and EditTemplate but thats getting a little crazy :)
I have a Gridview in which no rows populated initially. means i am not setting any datasource to gridview.I have to populate gridview by adding footerrow.I have given visibility of footerrow as true.So one error is coming as 'Object not set to an instance of an object'.what may be the reason for this? Can anybody help?
Actually i need to add data into the Gridview through the FooterRow.After inserting a few records,i need to insert this data into the database.So, i want this Gridview only to insert data into the database.For a particular "FileID", i have many records,thats why i am using Gridview.Is there any other method for this?
See this question: How to insert a Row in GridView.
The object reference error is probably because you have set no datasource for the GridView. In such cases, the Gridview will not render.
Edit:
I have already linked to another question which provides a very useful link to accomplish the type of functionality you desire. Since you appear not to have found it, here is the relevant link - How to easily insert row in GridView with SqlDataSource?
The article shows how you can use the EmptyDataTemplate of the GridView to enable record insertion using a GridView. Note that you will have to modify the logic a little to insert a group of records in one go, rather than one at a time.
If you have a problem with this solution, please clarify via comments.
Well i have a gridview where i have defined the columns on my own and turned autogenerating off but now i have the problem that i cant access GridView.SelectedRow.DataItem.
As it turns out to be null now, when it had a value when auto generation was turned on..
Edit:
What i need is a way to save the ID of the row while not showing the ID to the user so if there is any way to do this?
I'm guessing DataItem is only properly filled when you are using DataBinding.
Are you using DataBinding?
Ok from this url:
The GridView (and actually, all our
data controls) does not save data
items across postbacks. This reduces
ViewState (if the objects are even
serializable) and enables garbage
collection to happen and clean up your
objects. So, when you click the
button to post back, the GridView has
not called DataBind and therefore your
data item isn't there. This is what
you've discovered.
Guessing you're reading the value from a postback, might just be the problem.
Try using SelectedValue, if you've setup the (primary) key for the items.
I've always used that and it worked.
msdn about SelectedValue
You can create a new hidden template column that will have a label with the ID . and in the cs file you use .FindControl on the rows.
You also have DataKeys property on the gridview, witch I think also does what you want