Forms Data Controls :: GridView TemplateField Vanishes On Second Postback With Some Dynamic Content?

Dec 23, 2010

(Example code below)

I have a GridView. It has a 'static' TemplateField (in the .aspx page). I add and remove BoundFields to it depending on user preferences on postback. Affter the second postback, the template field appears empty.

Here is a stripped down mockup of what I'm doing. You can click the "Regular Postback" button as much as you want, and nothing bad happens. But if you click the "Recreate" button once-- it's all ok. Click it again, and the "one" column goes on Christmas break.

So is there something else I should be doing, or is this going to be a "halcyon1234 to code interface" error.

[Code]....

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Forms Data Controls :: Finding The Dynamic Templatefield Control In A Gridview?

Dec 16, 2010

I have a gridview where I in codebehind add a templatefield

[Code]....

In my update command when i try to find the "Result" textbox I get a null object
[Code]....

In the gridview there is another templatefield "Name" that consist of two boundfields("Firstname" and "Lastname") This column is added in the design phase and not in the codebehind.I don't have any trouble finding these controls using the ID added in the markup
[Code]....My issue is with the result column that I add in codebehind.

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Sep 8, 2010

I already implemented the dynamic templatefield which will re-created in every postback. Everytime I make a postback in the page I see no problem but when I click my imagebutton inside the gridview then the dynamic templatefield disappear.

To double check if it is really gone at all I just select the second page of the gridview using my customize paging using dropdownlist outside the gridview and the templatefield with its correct data reappear again.

I already put a variable inside the rowcommand to see if the number of columns are the same with the number of columns the gridview render together with the dynamic templatefield during debugging and it is there but cannot render that templatefield in the client.

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Dec 29, 2010

I have a gridview in which i have declared one static templatefield (with some button ctrls inside) in design itself.

I add the remaining columns to it as a dynamic templatefield by inheriting the ITemplate interface.

My problem is that now when i cause some postback for the firsttime after the Gridview is bounded, it works fine. But when i cause some postback for the second time, all the controls in the static templatefield disappears.

below is my code

[Code]....

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Jan 7, 2010

I have a page that has a gridview which contains a loginview that contains hyperlinks with different navigateurls based on the role a user is in. When then page first loads everything displays correctly. However, if there is more that one page of data and the users clicks on a subsequent page, the column with the hyperlinks is blank (the anchor tag gets written out but no href and text) all of the other columns display correctly. If you click the back to page 1 the hyperlink is blank. The only way to get the data to redisplay is to reload the page.

Is this a proper use of the loginview control?

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I have a requirement to use gridview to show and update the information. Here the columns are not fixed, it needs to be dynamically generated. So for this I create a class extending ITemplate and created a ItemTemplate. There is no problem is load the grid, only the big problem is that I am not able to access the controls that are inside ItemTemplate on postback, Even after Init the girdview on postback.

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May 4, 2010

have an ASP.net 4.0 page containing a GridView, where during the Page_Init event I'm dynamically adding BoundField columns to the gridview. I also have some custom sorting and paging methods that I use with this gridview, which result in postbacks on the page. In Chrome, Firefox, Safari, and Opera the gridview behaves as expected. HOWEVER, in IE 6, 7, or 8 when I click to sort a column in the gridview, or go to the next page of results in the gridview, it does not bind on postback, returning nothing back to the browser. Again, in anything but Internet Explorer, paging and sorting (frankly any postback event) brings back the gridview in its expected state. I only have the problem in IE. Relevant snippets of my code follow, where you'll see my Page_Init event calling a method in my WebFunctions class to add the BoundField columns for the table I pass to it, and my Page_Load event that calls the method in the user control responsible for binding my dataset to the gridview. Initial page load works in all browsers, but postback loading of the gridview only works in non-IE browsers.

[Code]....

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I created a templatefield programmatically and it works fine but whenever I clicked the button inside the gridview and do the postback my templatefield are gone.

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Jan 13, 2010

My datasource is an ado data table that I have convert to a new data table so that each row in the original table is now a column with 1 row in my new table. I then bind the new datatable and create dynamic template fields with a text box where I bind the values. My problem is, when I try and retrieve the values changed by the user in the rowcommand event, the template columns no longer exists.

Does anyone know how i can retrieve these values? I've read over and over that you have to rebind the grid on each postback when you use dynamic templates, but I'm not sure how to do that and retrieve the values entered in the text boxes on the client side.

[Code]....

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Aug 18, 2010

I have a Gridview, which I bind to a Dataview programtically. My Gridview has 11 columns. Sorting works fine as long as I do not remove any columns programtically.

In certain cases I remove 2 of the columns from the Gridview. Still not a problem. All the data is properly displayed however the problem occurs when I sort one of the columns. I sort the Dataview and bind to the Gridview again. Data from two of my columns just vanishes. Both of these columns are based on ItemTemplates. The columns are still displayed but just empty cells.

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Mar 1, 2008

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Jun 3, 2010

I've got a template field in a gridview that contains just a simple button...

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Administration.aspx.cs"
Inherits="Administration" %>
<%@ Register TagPrefix="ajaxToolkit" Namespace="AjaxControlToolkit" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

[Code]....

Whenever I click the button I get the error...

Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

I've found a decent amount of articles referencing this issue, including a couple on SO, for example...

[URL]

and...

[URL]

I might just be misunderstanding, but as far as I can tell they don't really help me. How do I get this to go away without setting enableEventValidation="false"?

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protected void Page_Load(object sender, EventArgs e){
for (int i = 0; i < GridView1.Rows.Count; i++)

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Nov 23, 2010

I have a GridView, bound to a table (Meals) in a SqlDataSource.

Into that GridView, I have added a TemplateField, which contains a DropDownList (which displays the numbers 1 - 10, added manually; no Data Binding). And, I've added a ButtonField.

When I click the Button, I want the values of some of the GridView rows PLUS whatever value was selected in the DropDownList to be pulled out and stored in a second Sql table (Orders).

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Here's the code and the error message I'm getting.

ASPX:

[Code]....

And here's the Code Behind:

[Code]....

No design time errors reported but here's the run time error:

Object reference not set to an instance of an object.

On the following line:

Line 28: if (row.RowType == DataControlRowType.DataRow)

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[Code]....

[Code]....

I want to add two image button in the TemplateField.. and add it in the gridview.

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I have dynamically created my gridview in the codebehind.

All is working correctly.

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Button btnRemove = new Button();

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I'm relatively new to the VS environment. I'm using VS2010 Beta 2 with VB. I have a Gridview setup to pull a list of employees. Next to their name I have edit and delete icons. When I leave the icons as ButtonFields, they pass the DataKey value to my code behind perfectly. When I convert the ButtonFields to TemplateFields, they no longer pass the DataKey.

[Code]....

[Code]....

[Code]....

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I have a programatically generated GridView with a TemplateField in it. I can create the TemplateField and the controls within the TemplateField without an issue. I can also Bind the data from my GridView to the controls in the TemplateField, but only one-way. I'd like the control to also work with the Update command on the GridView.

To bind the data to the control I add an event handler for the DataBinding event, and in that event I use the following code:

ck.Checked = (bool)DataBinder.Eval(row.DataItem, "Queries");

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[Code]....

2nd. I have SqlDataSource for my GridView. this is the code :

[Code]....

We can set value in the *.aspx or design view by using <%# bind("str_isi") %> like the asp:label control with ID=lblGvPengumuman but how we can set value in code behind?

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here is my code:

<asp:TemplateField HeaderText="Groups">

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[Code]....

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Below is the code for my page.

[Code]....

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here's my code:

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TemplateField source
<asp:TemplateField HeaderText="Agent">
<ItemTemplate>
<asp:DropDownList ID="ddlAgent" runat="server" AutoPostBack="False" OnSelectedIndexChanged="ddlAgent_SelectedIndexChanged">
</asp:DropDownList>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center"></ItemStyle>
</asp:TemplateField>
ddlAgent_SelectedIndexChanged

Protected Sub ddlAgent_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
Dim gvItems As DropDownList = CType(sender, DropDownList)
' Write the selected Agent ID to the Inquiry record.
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--Grid View--

<asp:GridView ID="GridItem" runat="server" AllowPaging="True"
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