Forms Data Controls :: When To Call DataBind On GridView
Sep 2, 2010
So I have a GridView and several events that can be triggered (such as filtering and inserting a new record) to manipulate the GridView. I want to make sure that I'm not calling DataBind on Page_Load, especially since I might have to call it again when certain events fire. Is there a way I can make it so I only have to call DataBind once on the GridView after Page_Load and anything else has fired? Like some event that will absolutely fire last where I can put my DataBind?
The reason I need to do this is because the DataSource for the GridView is set programmatically from a DataView when the page is loaded, so DataBind needs to run every time. Just, hopefully, not multiple times each time...
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Aug 25, 2010
in datalist templatefield, i want to bind an imagebutton's visible property. the scenario is .. it is a picture comments page like one in facebook. if its your own comment, the delete button is shown, otherwise not. the problem is .. for the imagebutton i want to set visible = false, if the user logged in is the same user as the one who commented. how can i do that ?
currently im using this code on datalist databind event. but the label is returned as null
public bool set_visibility()
{
Label lb = DataList3.FindControl("Label7") as Label;
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return true;
else
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}
findcontrol dosent return the control.
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May 8, 2010
I am developing a usercontrol which has a gridview control in it.
Now I want to set the datasoruce property of gridview. Datasoruce will be a generic list (List<Class>).
How to do this ?
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Jan 25, 2011
i am getting following error on gridview.databind() Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack , ThreadAbortException,it was working fine and suddenly getting error, i don't what's problem is?
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Jun 26, 2010
I'm working on a project where I have to create a page that displays the "health" of a system. I run a query and display the results in a gridview with a red or green icon next to it. This works fine when the page is first loaded. My problem is that I have a thread that runs a query every 30 minutes and rebinds the gridview but the gridview never refreshes even though the data has changed. How do I get the gridview to display the new results? The databound event never fires a second time even though I can clearly see that I have received new data. I assume I am missing something simple but I just don't know what. What am I doing wrong?
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Mar 7, 2011
I have a gridview positioning issue that may have been answered elsewhere, but I couldn't seem to find a similar post...
I have a webforms app containing a paged gridview (e.g., 200 records - 50 rows and 4 pages).
When the user clicks on a button in a specific row, another web page is launched to process that button click. When the user closes that page to return to the main gridview, the databind event is rerun and the page redisplays the gridview starting at the top. However, I want to have the previous position maintained (like an html bookmark), so that the grid will automatically be scrolled to the the previously clicked gridview page and item.
Setting attributes such as "MaintainScrollPositionOnPostback" do nothing in this case.
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Mar 21, 2010
i'm opening a new window and passing on to it variables in a querystring, the values are loaded into a function that is filling my dataset and then filling my Gridview. after i press the button field in my grid to delete an item, the databind doesn't show the updated grid but remains the same. i've noticed that if i navigate back and refresh i see it correctly. in FF btw no problem.
the code:
this is used to open the new window
[Code]....
[Code]....
[Code]....
[Code]....
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Apr 23, 2010
I am have a page with a couple of dropdowns which serve as criteria for a select SPROC. Once a selection is made in a drop down a panel is shown which contains gridview whose rows have been returned by the select SPROC.If you close the panel and change the drop down selection and then redsplay your panel the data from your prior selection is still displayed in the gridview,
unless you page to the next group of records.
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Sep 16, 2010
Getting the following sql timeout on a page System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
GridView1.DataBind();
While I know I need to review the actual Stored Procedure used, can someone point me to a quick fix to increase the timeout on the databind.
Below is my datasource
[Code]....
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Dec 28, 2010
I have a gridview which is populated by SQL command at page load. Here is the sample below;
[Code]....
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Nov 12, 2010
I have spent most of my time writing ASP.Net web pages, using VS 2005. I am now developing some client function for Windows, so I'm relatively less expert in VB.In my Windows program I have defined a DataGridView and linked this to a data table (within a tableadaptor). Now I want to populate it: on a web page's code-behind I would write Gridview.databind(). What is the equivalent with a DataGridView.
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Dec 22, 2010
I've this table Table1(ID , LinkURL , LinkText )
I would like LinkText to display as a link. And when you click it takes the value from LinkURL and directs you to another page.
This is the code:
<asp:GridView id="GridView1" runat="server"></asp:GridView>
And this is the code-behind:
connection.Open()
Dim reader As SqlDataReader = cmd.ExecuteReader() [code]....
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Aug 21, 2010
I have a drop down menu that is populated on page load. Below that, I have a gridview that has a select parameter based on that drop down menu's value. I can't get the gridview to populate with data based on the drop down. If I fill in the parameter with a constant, the data pulls fine, but when I switch the parameter to a form parameter, it won't pull.
Here is the relevant piece of the aspx page:
[Code]....
Here is the relevant section of the code behind:
[Code]....
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Jun 14, 2010
I'm trying to databind my GridView to a custom datasource where one of it's members/fields is a collection.
Custom object Entry
public List<EntryHour> Hours { get; set; }
In practical terms, one row consists of some normal text fields which is easy to handle. However, the Hours field is the nut to crack.
How do I, in the GridView markup bind my textfields in question to the Hours field (which consists of 7 items allways)?
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Feb 13, 2010
I am using a dataset for the first time and so far it is going quite well. The one thing that I have not found in tutorials though is how to add a select command to the gridview when i do gridview.databind()
The gridview is just a simple click and add at this point and my code looks like this:
[Code]....
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Jun 16, 2010
I am new to Entity Framework and working my way through it little by little. I think I have it figured out on how to get data into and out of 1 table at a time now the challenge is 2 tables into a gridview.
I have a user table that has a list of threads that a user can mark to track. Easy enough. Assign the userid number & threadid to a table with a push button while the user is logged in and viewing any of the posts that are on that thread. The new challange is to get only the posts that the user has marked to track. SQL easy. Entity not sure what to do.
If I make a view or stored procedure and add it to the database that would be an extra step. To join the 2 tables as in sql Select posts from posts where track.userid = @userid join track on post.userid=track.userid Seems Entity was made to avoid this type of thing. Than once the data is gathered I need to bind it to a gridview()
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Oct 19, 2010
I have tried several ways but just cannot figure our how to populate some formviews with the data I have brought up in a gridview.
Here is my code so far. I just showing the code behind because my gridview and forms are not a problem. Where I am stuck is at the GridView1_SelectedIndexChanged at the bottom of the code.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.UI;
[Code]....
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Jan 29, 2010
I have a page with a gridview control that shows files that have been uploaded to our site. The name of the uploaded files, who uploaded them, and if they have been downloaded, etc are stored in a table. The gridview is bound to the table through a sqlDataSource control. I have a button column in the gridview that downloads the file associated with a row when the button is clicked. All that works well. I have a check box column that shows checked if a file has been downloaded. When the download button is pressed.
the file downloads and then a short routine is run to update the downloaded field in the uploaded files table to set the downloaded field to true. This is done through a command string. All this works. Here is the question. After the update is run I do a databind on the gridview to update it. The databind is run in the PageLoad event is the page is a postback. This does not cause the current row to show downloaded =true (checked). If I refresh the page in the browser then it displays correctly.
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Nov 21, 2010
On my aspx page I use a popupmodalextender to show (and edit) some data that is contained in a gridview (gridview is on the same page). Popup works OK and also the editing of the data, but when I close the popup (from code behind) the data in the gridview is not refreshed.
Aspx:
[Code]....
Code behind:
[Code]....
Why doesn't databind() work until I refresh the page?
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Feb 8, 2010
I need to display data returned from a sql query into a gridview. This is easy enough to accomplish by running the code below:
Dim command As New SqlCommand(sql, connection)
command.CommandType = CommandType.Text
connection.Open()
Dim da As New SqlDataAdapter(command)
Dim ds As New DataSet()
da.Fill(ds)
Me.grvDisplay.DataSource = ds
Me.grvDisplay.DataBind()
My issue is that for one of the columns, before it gets bound to the gridview, I need to format the value. Basically, it returns a value like 7.21. Each number represents something, so I need determine what this and display the worded value. I tried to do a datareader (see below) before the binding and store that value into a session variable and display that session variable into the gridview, but it just displayed the same value over and over.
Dim dr As SqlDataReader = command.ExecuteReader()
dr.Read()
Dim RT As String = ""
Dim VersionName As String = ""
Select Case Left(Replace(Mid(dr("Version"), 2), ".", ""), 1)
Case "1"
RT = "Pre-Release"
Case "2"
RT = "Final Release"
Case "3"
RT = "Interim Release"
End Select
Session("VersionName") = Left(dr("Version"), 1) & " Data Base " & RT & " " & Replace(Right(dr("Version"), 1), "0", "")
dr.Close()
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May 18, 2010
I have a grid with edit link.
when user clicks onedit link , i want to show modal popup extender which displays text boxes for editing those data.
when user finishes editing the grid should again updated.
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Jan 6, 2010
In a GridView control ASP.NET
OnRowDataBound="gvTest_OnRowDataBound" followed by
protected void gvTest_OnRowDataBound(....){}
OR
Text='<%# BindMyData(DataBinder.Eval(Container,"DataItem.Price"), DataBinder.Eval(Container,"DataItem.CurrencyID")) %>'
followed by
protected string BindMyData(object price, object currencyID)
{...}
Which one is best in terms of performance and coding best practice?
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Jan 26, 2011
I am getting error on attempted Databind call to DataList1 with nested SqlDataSource tool after attempting to update or delete a record.
The SqlDataSource control 'sqldsfilelist' does not have a naming container. Ensure that the control is added to the page before calling DataBind.
Here is the aspx page code.
[Code]....
And the code behind....
[Code]....
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Oct 30, 2010
I have a gridview in web user control and when i try to bind the datasource during the Page load process, an exception occurs. The datatable is retreived successfully without errors( I could view the data inside using the debugger ) but once gridview.databind() process takes place, exception occur. Could anyone tell me what happens ? This is really weird to me coz if such gridview is placed inside a content page instead of a webUser Control, no exception or error will occur.
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Apr 20, 2010
How to change the values in gridview on text change of templated control without databind again?the value of templated text boxes should change If i change the value of one of the templated textbox then accordingly(By mathematical calculations) the vlaues of all tempated textboxes should also change.
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