Forms Data :: Losing Data On GridView Control
Oct 5, 2010
I have a page I use to update a student's personal and grade information. I use a formview control to enter and update a students personal information. I use a gridview control to enter and update the student's grades. When the user wants to make edits to the data, they make the changes in the formview and the gridview, then press a "Save" button, which runs code behind that reads the formview and gridview data, builds two SQL UPDATE statements, then performs the update on two SQL tables (the Students table and the Grades table). This seems to work fine in most cases.
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Jun 22, 2010
i read the tutorial on msdn,what i want is to basically make astructure like of gridview, but not gridview.i want that when a post back occurs by any control the table does not lose its data, it preserves its state.as a result i am not able to add rows to the table in an increment fashion, everything gets destroyed on postback.
[CODE]...
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Dec 28, 2010
how to create unlimited user control without losing the data... My problem is on postback.. i searched a lot but m not get solution.. my question is how to recreate unlimited controls(textbox,dropdown) and how to maintain the data in the controls.. Now am able to create dynamic usercontrol (unlimited) when Button click event using for loop but not able to maintain the data during postback.
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Nov 3, 2010
i have a global field called hotelId. i then have this piece of code that gets a value from gridview row:
[Code]....
the local variable is assigned to my global one, which gets passed to my method along with other variables. while stepping through i can see the value is set, but when i hit the submit button variabl is passed to another method except my hoteId. it gets lost...
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May 20, 2010
I have a gridview with auto Edit buttons... when I click on Edit button it is losing it row and column colors.We are initially setting the gridview colors in the page_load event.
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Jan 11, 2011
I have the following gridview...
[Code]....
And inside that gridview you can see I have a dropdownlist called dpdTrueFalse. That dropdown has two values which I am loading from code behind like this...
[Code]....
I have a submit button outside that gridview that checks each row and the selected value in the dropdown. But for some reason, even if you select another item in the dropdown, it always selects the first item in the dropdown when I click the submit button. I reckon its because of the postback.
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May 15, 2010
I have a dropdown list inside a gridview:
[Code]....
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Feb 19, 2010
I have an upload control (csv file) of which I use the stream to retrieve data in a datatable that I then bind to a datagrid, sitting in a repeater control.I have to bind more than one record to the repeater, therefore I need to find a way of storing the stream for each binding, so that I can bind it to the datagrid again, via itemdatabound event of repeater.
I have tried storing the stream in the repeater's datatable but on each postback, the content of the stream gets lost. The stream still exists, but its length is set to 0.I have tried storing it in a session object, but again it is reset to 0.
I have tried using viewstate but I get a xmlserialization error. Saying IXmlSerialization is not implemented.I am desperate to find a work around as I am feeling the pressure at work.
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Feb 19, 2010
Is there a way to keep (automatically) the data posted before a redirects to the another page? And then reapply the post data to the this Page upon return? Here is what I want to do :
[Code]....
I noticed that some websites are already doing that. Such as phpbb forums, when composing a message and the session expired we are redirected to the login page and then we return to our post without anything lost. However, I know that it is in PHP but it remain a web application at all ;) I thought of a system of modal box that will appear directly in my MasterPage so don't need to redirect, but I do not like the idea. If I don't find any solution this could be a workaround. But I don't like it.
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Jul 3, 2010
Private Sub UpdateOffensiveStats()
Repeater losing data on postback
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Mar 3, 2011
In my scenerio, i've a dropdownlistbox by which i want to filter, a textbox for the text to filter and two textbox for specifying from and to date.
A gridview control for displaying the filtered data and a sqldatasource control and a commandbutton called search.
The following code is used to filter the data in database and it works properly. But when i click on edit in gridview, the gridview displays no records and again when i click on search button the data is displayed on the gridview displayed with the selected row in editmode.
protected void btnSearch_Click(object sender, EventArgs e)
{
string query;[code]....
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Dec 30, 2010
I have a FormView that is used to insert records into a table. It is set to a default mode of insert. When I click a LinkButton it makes the FormView visible and populates a DropDown List control via code. When I click the Insert button, it inserts the record into the table but then the DropDown List selections disappear. How can I keep the selections so that I only have to fill it once?
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Aug 18, 2010
Using the code below, I am able to load my dynamic dropdownlist and supply it's selectedindex. But when I fire the update command I can see that the information displayed has been lost.
when I fire the update I don't lose data!
[Code]....
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Oct 6, 2010
I am new to this forum as well as Visual Studio and asp.
I am connecting to an access db using Visual Studio Express 2010.
I have a dropdownlistbox that pulls names from a database. When I select a name Gridview1 gets populated. Now I want to populate Gridview2 with more data when I click 'Select' link in Gridview1 but it's not working.
I am passing name (string) and number (number) fields to the gridview2 based on the gridview1.selectedvalue property and am seeing:
Input string was not in a correct format.
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Mar 27, 2010
I am in beginner level on developing web pages. I was coding on desktop applications and as you know it is easy to say that web applications are extremely different than desktop applications.
I wonder why data are lost between postbacks.???? And what is the best way not to lose the data belonging to a specific control (especially gridview). Session or viewstate or anything else?
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Feb 28, 2010
public static int _CompanyId;
I am assigning some value to _CompanyId after login .After some post backs i lose value in_CompanyId .What could be the reason ?
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Jun 4, 2010
how to center align the column data in a gridview control in asp.net 3.5?
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Apr 14, 2010
ASP.NET 2.0 application exports GridView data to Excel2003 as shown below, but then needs to be able to access the Excel instance; to add a title row, auto-fit column widths, rename the worksheet, etc. Can anyone explain/show how to reference the Excel instance programmatically?
Response.ClearContent()
Response.AddHeader("content-disposition", "attachment;filename=MyFile.xls")
Response.ContentType = "application/vnd.ms-excel"
[code]...
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Oct 7, 2010
How to show Group Data in the GridView Control like
ID CityName CityCode
India
1 Chennai CH01
2 Mumbai MU01
3 Delhi DE01
Srilanka
4 Columbo CO01
5 Gandi GA01
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Oct 12, 2010
a simple way to filter SQL data when it is retrieved by a GridView control?
Among the various applications I need to create are selecting records based on user inputed criteria (via a DropDownList), and excluding records that have null values (which I need to allow in my database) in certain columns.
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Feb 24, 2011
in converting gridview data to chart control,i am using asp.net 3.5 and vb.net.
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Apr 19, 2010
I have requirement that i have to accpted data from user in a gridview like control.That its row column heder contatin calender date and row header contain specfic taske ,one have to drag and drop user coreponding date to specfic taskfor eg: column header contatins dates like 1/04/20010 to 30/04/2010and row header contain specific task.one user drag and drop sepcfic entity correspond to sefic date and specific controlI have gone through site to find this type of control allow drag and drop and customize column and row header.
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Apr 10, 2010
I've got a GridView populated via a SqlDataSource whose Select command is controlled by a DropDownList. This is all working nicely:
How do I support the "All" user choice:
In other words, when the user selects "All" there are no aircraft names that match that so nothing is returned. Instead, I'd like the select statement to skip the WHERE clause in this case and just show everything. Do I need to create a second page for this case or is there a way to programmatically alter the SELECT command or some other way to accomplish this?
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Jun 24, 2010
I'm a bit of an ASP.NET newbie and I am creating a data table in memory and binding this to a gridview control. The code is as follows:
Dim DstBasket As New DataSet, TblBasket As New DataTable
With TblBasket
.Columns.Add("BskPrdCd", System.Type.GetType("System.String"))
.Columns.Add("BskPrdDesc", System.Type.GetType("System.String"))
.Columns.Add("BskQty", System.Type.GetType("System.Int16"))
.LoadDataRow(Split("12345,Test product 1,1", ","), True)
.LoadDataRow(Split("122,Test product 2,2", ","), True)
.LoadDataRow(Split("123A,Test product 3,5", ","), True)
.LoadDataRow(Split("44,Test product 4,1", ","), True)
End With
DstBasket.Tables.Add(TblBasket)
With LfnGridView("GdvBasket")
.DataSource = DstBasket
.DataBind()
End With
The data displays in the gridview control fine with both edit & delete options but when I attempt to delete, it has no effect. How do I force removal of the relevant row from both gridview and table? Most of the documentation I have unearthed shows how to achieve this when connected to a SQL table which is clearly not the case here.
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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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