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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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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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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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 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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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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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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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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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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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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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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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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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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Jun 9, 2010
Can you databind a caption when using a gridview?
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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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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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Aug 17, 2012
I use these code in my page_load event
while (_dr.Read())
{
txtarticle.Text = _dr["Name"].ToString();
CKEditorControl1.Text = _dr["Description"].ToString();
And this is my table in database
pdf Description Name ID
Article.pdf Test1 Article1 1
Article2.pdf Test2 Article2 2
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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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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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Feb 16, 2012
I want bind more than 10000 records in gridview and improve performance.
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Sep 16, 2010
I reference a user control in my ListView in this manner:
[Code]....
The problem is that the #Bind command doesn't update the database, but it does so when I paste the code directly into the aspx page (in other words, without the user control involved).
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Jun 17, 2010
I made a composite control that contains a ListBox. I am using the Composite Control throughout my application but I can not bind the listbox in the Compositecontrol. I have setup a Public get to access my listbox in the composite control.
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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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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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