C# - Programmatically Databind A GridView Control

Sep 27, 2010

I have a blank/unbound GridView control on my form and I am binding it in the code behind like this:

GridView1.DataSource = _dataSet
DataBind()

Running this code populates my GridView control with all the columns and data that _dataSet has. I want to display only some of the columns, change the column names, and rearrange some of these columns too (i want the last column from the actual sql database table to be displayed first in my GridView).

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Web Forms :: Databind() In Gridview Does Nothing In IE / Databind Doesn't Show The Updated Grid

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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Forms Data Controls :: Gridview Inside User Control Databind/how To Set The Datasoruce Property Of Gridview

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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ListView Programmatically Adding Row After Databind?

Jun 30, 2010

What I would like to achieve:

I would like a user to be able in insert a row into the listview. BUT not into a database.

What I am stuck on:

Currently I am stuck on the OnItemCommand, i dont seem to be entering the method. Code below.

[Code]....

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Forms Data Controls :: GridView Control On Page Not Showing Current Data On Databind

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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Forms Data Controls :: How To Change The Values In Gridview On Text Change Of Templated Control Without Databind Again

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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Forms Data Controls :: Timer Control Timer Event Forces A Gridview Databind Every 10 Seconds?

Nov 25, 2010

VS2010 ( Vb.net ).I have a masterpage that contains a gridview, giving stats and information on client files sent to us. This gridview is updated by means of a timer control every 10 seconds. In my grid I have an image field, to display either a tick .. if everything is ok or a cross for any problems.When the timer control timer event forces a gridview databind every 10 seconds.When the page first loads, i get the default red Cross in the gridview imagefield, however when the timer loops forces a 'databind' I lose the redCross and it is replaced with the default image control ( as if no url is set ) . Then I get a server 404 error.I am using the OnDataBound event to fire my vb sub. I have commented out evertything just to get a solid starting point but im still getting errors.

[code]...

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Forms Data Controls :: Programmatically Mapping Eventhandlers To GridView Control?

Nov 27, 2009

Here's the code:

protected void Page_Load(object sender, EventArgs e)
{
//Create a DataTable instance
DataTable table = new DataTable();

[Code]....

The above is the code I use to programatically create and populate a gridview. I'm really new with .Net my problem is this, when I create a gridview programatically I can't find a way to capture the sorting events.

I know it's typically done in codebehind methods of the style;

protected void gvID_OnSorting (Object sender, GridViewSortEventArgs e)
{
//do me
}

But I can't seem to connect the Sorting event call to the codebehind method.

Basically what I figure is that I want to set this property

<asp:GridView
OnSorting ="gvID_OnSorting">, in code.

How would I go about doing that??

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Custom Control + Image - Error - The Control Collection Cannot Be Modified During DataBind?

Mar 11, 2009

I created a new custom control that inherits from Image. Basically I wanted to add a HyperLink to the custom control (On the outside). So I did the following:

HyperLink hlLink = new HyperLink();
hlLink.NavigateUrl = "http://www.yahoo.com";
this.Parent.Controls.Add(hlLink);

But I get the error:

The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.

How can I go about surrounding the custom control I created in a HyperLink, is this even possible?

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Gridview With Navigate URL Databind

Sep 11, 2009

This should be simple but I can't figure it out. I have a grid view that includes a link. I am trying to bind date to the navigationURL. The data includes the id (primary key) and confirmNum from the DB. I have the id working but can't get the confirmNum to show. Here is the code:

NavigateUrl='<%# DataBinder.Eval(Container, "DataItem.id", "MyRequests_Full.aspx?id={0}" + "&confirmNum=DataBinder.Eval(Container.DataItem, "confirmNum") %>'
Any Ideas?

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Databind A Caption When Using A Gridview?

Jun 9, 2010

Can you databind a caption when using a gridview?

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Winforms - Why Is There A Databind() For Gridview

Mar 5, 2010

Why is there a need to explicitly call GridView.DataBind() to render the gridview. Why wouldn't it render by itself automatically like how it happens in Window Forms?

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C# - Databind A Gridview Populated In The Code Behind?

Nov 16, 2010

I have tried a lot and have reached a dead end.

I have a to show multiple gridviews on one page and all these are getting populated dynamically.

i have figured a way to populate the gridview dynamically and display them, but i cannot get how to modify these values and display them as i want.

here is the code. for .aspx page

[code]....

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C# - DataBind User Controls In Gridview?

Jan 26, 2011

I got a GridView in ASP.Net in which a user control is placed:

<asp:GridView ID="GVWunitcollection"
CssClass="gridview"
runat="server"[code]....

I bind the GridView to a List<T> filled with custom 'Unit' Classes. Each Unit consists of several properties to fill the usercontrol. (The user control holds a table, and some labels and textboxes).How can I achieve this? Is there a simple way to bind each usercontrol to the appropriate Unit?By the way, this is my way to mimic a "dynamic" behavior of multiple usercontrols on a page. If there's a more simple way, I would like to know how!

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Repeater Template Sub - Control Visibility Before Databind

Jul 1, 2010

I have a custom control which contains a Repeater control. The Repeater has an ItemTemplate. Inside that item template I have a panel which is going to hide something based on "IsEditable" a boolean property of the custom control. What I would like to do is set the panel's visibility once before the Repeater is databound.

I know I could do an onItemDataBound event and use FindControl to get the panel but that seems a little excessive since it will always be either visible or not for all rows and I have no other actions that need to occur on databind. Is there a way to find the control in the ItemTemplate before the Repeater is databound?

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Web Forms :: Custom Control With Databind And Collections

Jun 8, 2010

I've written a custom control that converts datasources into an IEnumerable and then binds the data. This works fine and I have LoadPostData working after postbacks. I can also using a collection to load it. Like adding listitems to a dropdownlist on an html page. This works fine and I have LoadPostData working after postbacks

[Category("Behavior"),
Description("A collection of CheckBoxItems"),
DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
NotifyParentProperty(true),
PersistenceMode(PersistenceMode.InnerDefaultProperty)]
public CheckBoxFieldCollection CheckBoxItems
{....}

Kinda struggling on merging the two. I think when i databind, instead of adding my CheckBoxItem to Controls I think I need to add it to my collection CheckBoxItems and then proced with creating childcontrols. It works the first pass through when I bind to the datasource. When I do a postback my controls collection goes to null. Can anyone point me in which direction to go? Also, after databinding, if I do , MyControl.CheckBoxItems.Add(new CheckBoxItem(..)), the new one doesnt show up.

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What's The Best Way To Databind A Listbox Inside A Custom Control

Sep 22, 2010

I have a simple custom control that boils down to a label and a listbox. Selections in the listbox are reflected in the label as comma separated values. My question is what is the best and simplest way to make the page developers experience of working with the custom control exactly mimic the experience of working with just the listbox - when it comes to working with data. For some reason it feels wrong to simply create mirrored properties in the custom control and forward their values to the internal listbox. A small, perhaps unrelated complication is that the final product has to play nice with the forms collection due to the nature of the host application.

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Databind A Property On A Custom User Control?

Nov 29, 2010

I have a custom user control UserProfileLink on which I have two basic string properties, UID and UserFullName which I would like to use in a template column in a DataGrid like this:

....
<ItemTemplate>
<td:UserProfileLink ID="uplUser" runat="server" UID="<%#Eval("UserUID") %>" UserFullName="<%#Eval("UserFullName") %>" />
</ItemTemplate>
....

I get an error saying "The server tag is not well formed" which leads me to believe this type of binding isn't possible. Is there a way to do this, or is it impossible?

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DataBind Versus Setting Control Properties

Nov 9, 2010

Regarding these two approaches:

<asp:Label ID="Label1" runat="server"><%# DateTime.Now %></asp:Label>

and

Label1.Text = DateTime.Now.ToString();

Which do you use and why?

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'DataBind' A Single Property Of A User Control?

Dec 3, 2010

Before I get to the question, let me give a bit of background. I'm trying to develop a custom caching mechanism that I can apply to custom built user controls. (Please be aware that I know that there are some built in caching mechanism in .NET) Depending on certain flags set declaratively in the mark-up the control should load a cached version of its previously rendered content or execute normally (and if certain flags are set it should generate a cache of its content for next time it loads). I would like to be able to pass certain flags declaratively in the mark-up and being able to check their value at Page Init and, depending on the flag value, determine whether the control should load a cached version or not.

<uc:MyUC ID="N1" runat="server"
CacheProp='<%# SomeEnum.A | SomeEnum.B |SomeEnum.C %>'
PropA='<%# this.SomePropA %>'
PropB='<%# (this.SomePropB %>'
PropC='<%# this.SomePropC %>'
/>

The problem that I'm facing is that as far as I'm aware I can only get the value of the properties declaratively assigned in the mark-up if I called the DataBind(). However I'm faced with two problems: Firstly calling this.DataBind() from within MyUC will trigger the binding of all its child controls which would defeat the purpose of the cache; also all user controls have been built so that they will not call DataBind() before the LoadComplete event has fired, so to make sure that the parent controls they live in has done its initialisation and has computed the properties that are declaratively passed to the child user control (ie PropA, PropB, PropC).And now the question: is there a way to bind the CacheProp property so to retrieve its value without data binding all other properties and without triggering the data binding of all its child controls?

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C# - Show GridView Inside Login With Databind In C#?

Mar 17, 2011

If outside the loginView, the gridview can show correctly! Put inside Login View and use below code

<LoggedInTemplate>
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
</LoggedInTemplate>
((GridView)LoginView1.FindControl("GridView1")).DataSource = query;
((GridView)LoginView1.FindControl("GridView1")).DataBind();

Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error:

Line 22: ((GridView)LoginView1.FindControl("GridView1")).DataSource = query;

How to show GridView inside Login with databind in c#?

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C# - Databind A Gridview To A Field In A Base Class?

Nov 16, 2010

I have the following classes (pseudocode):

Item ( int Field1 )
ItemDetail : Item (int Field2, string field3)

If I set ItemDetail as the datasource for an asp.net gridview:

grid.DataSource = new List<ItemDetail>();
grid.DataBind();

Can I use Field1 in the GridView? If so, what is the correct DataBinder syntax? The following code blows up trying to cast to an Item:

<%# DataBinder.Eval(Container.DataItem, "Field1") %>

EDIT: And I'm a moron. I had copied the gridview and was calling a RowDataBound event handler for a different grid... Sorry to have wasted everyones time, but there is some good info here regardless if anyone has the same question. In the end, the public properties of the base class are binding correctly.

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Jan 18, 2011

I'm binding an object to a gridview. The object (LeClient) consists of several variables, two of which are related to its phone number. One variable contains a string of digits (LePhone) and the other contains an int that represents the country code (LeCountryCode). I have an extension method for strings that works to format the string LePhone and that I'd like to pass it LeCountryCode as the parameter.

So far, on RowDataBound I have an event handler with the following line:

e.Row.Cells[5].Text = (string)(e.Row.Cells[5].Text).ToPhoneFormat(1);

I'd like to replace the 1 with the corresponding country code that's stored in the object LeClient associated with the row. How does this work? I tried

.ToPhoneFormat(e.Row.DataItem("LeCountryCode"));

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C# - GridView.DataBind Not Refreshing The GridView?

Feb 13, 2010

To start I am using a MultiView control to step users through searching. The first page in the MultiView is just a search box with a button to preform the search.

The second page has the GridView, but I would like to keep the search box and button for the user to search again if they didn't find the user they were looking for.

When you search from page one and move to page 2 the GridView shows the correct results. But when it is on the second page with both the GridView and the search the GridView doesn't update. Below is the code I'm using.

[code]....

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Web Forms :: Implement Two Way Databind Custom User Control?

Nov 20, 2009

I have a gridview and inside it's edit template I want to bind a field to a user control. Something like this:

<uc1:MyUserControl
ID="MyUserControl1"
runat="server"
SomeValue='<%# Bind("Name") %>'
/>

The problem is that this is only one-way binding when I use a user control. If I had binded it to the Text property of a textbox instead, like this

<asp:TextBox
ID="MyTextbox"
runat="server"
Text='<%# Bind("Name") %>'
/>

then it would be a two way binding. How can I implement two-way binding i a user control?

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Place A Asp:datalist Inside A Repeater Control And Databind It?

Mar 31, 2010

Can I place a asp:datalist inside a repeater control and databind it for each time its repeated? Using VB.NET btw..

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Oct 16, 2009

I have a dropdownlist say ddl1 and a gridview gv1. Based on the value selected in ddl1 ie ddl1.selected value , I want to populate selected rows in the gridview .

dim returnvalue as datarows()
returnvalue=dt.select("month = '10-2005'")

where month is a column in my table The above code works but I want to check if rid matches ddl1.selectedvalue. I have tried this

returnvalue=dt.select("month = 'Cstr(ddl1.selectedvalue)'")...but it doesnt work

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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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Oct 29, 2010

am having trouble figuring this one out. Am using stored procedure and using databind for the gridview . i got the codes off other sites. I'm guessing its the code that i've underlined, how or what do i use as the datasource for the sorting event. I used the Session for the paging event and that works but not for sorting.

[Code]....

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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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