Asp.net - Bind A GridView To A Custom Object?

Apr 1, 2011

If I have the following ASP.NET code (it's not complete - obviously there's a lot missing, but none of it matters):

<asp:GridView>
<Columns>
<asp:TemplateField>
<ItemTemplate>

[code]....

How can I bind the GridView so that one row is equivalent to one item in my MyListOfObjects list, and so that the data will populate and persist across page loads or postbacks? I've never done custom databinding like this before, so a full explanation would be very helpful. All the tutorials I've come across so far only talk about using GridViews directly with Database query results, and that's not what I need.

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Asp.net - Bind Dictionary To GridView?

Apr 30, 2012

Algorithm to count the time that occured on the same period, how to bind the dictionary to the GridView? Pls take a look to the answer.

I tried to add a GridView and then on the code-behind: GV.DataSource = timeRangeCounts and bind it, but in return:

The data source for GridView with id 'GV' did not have any properties or attributes from which to generate columns. Ensure that your data source has content.

take a look at the code below:

The first helper class is used to hold the counts of exact and sub range matches:

Public Class TimeRangeCounter
Property ExactRangeMatch as Integer
Property SubRangeMatch as Integer

[Code].....

Bind SQL XML Field To Gridview?

Oct 23, 2011

I am trying to bind a SQL XML field to my gridview. [code]...

GridView Add Row - Bind The DataGridview With DB

Jun 22, 2010

I have bind the DataGridview with DB. To add the data from textboxes to DataGrid, I use the foll. code-

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Try
Dim row0 As String() = {TextBox1.Text, TextBox2.Text, TextBox3.Text}

[CODE]...

Error is coming: Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound. there is no any way to add data to the Gridview if we bound it to the Database.

Asp.net - MasterPage Data Bind To GridView?

Jun 14, 2012

I have a Master Page with nested pages in ASP.NET. Fairly simply I want to databind some hyperlinks to a gridview for the master page. This however is throwing a null reference exception when I try to set the DataSource.

I tested the code on a separate page and it works as expected. When debugging I can see the Page_Load Sub hit twice, I don't know if this is the cause I have one nested page being loaded, this is a blank page at the moment

EXCEPTION
Object reference not set to an instance of an object.
MASTERPAGE CODE BEHIND
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

[Code]....

Bind Gridview To Subset Of Array?

Dec 9, 2010

I have an array of objects I get from a web service. The 1st element in that array is meant to be displayed in a asp.net literal control. The rest of the elements are meant to be bound to a gridview.

Easy Way To Bind A Gridview With Dynamic Columns?

Aug 2, 2011

I have a variable defined as follows:Dim iRows As List(Of String())I've also been converting that to a list of lists just to make it easier to work with.Dim iRows As List(Of IList(Of String))I would like to bind that list to a GridView using the contents of the nested array/list to dynamically define the columns. I don't know ahead of time how many columns there will be, but I do know that they are all the same throughout the list.

Asp.net - Bind Radio Button List To Column In Gridview

Sep 22, 2010

I have radio button list in a gridview that needs to be bound to a column. If the value in a column is 0, the first radio button is selected, if 1, the other is selected. This is the code, some of it is partially removed because it is not necessary

[Code]...

Data Bind A Drop Down List In A Gridview From A Database Table Using VB?

Dec 4, 2009

So in this gridview, there is a column for status and I want to have a drop down list with Pass, Pending, Fail appear when the edit button is clicked. These values are already in a table, so I need to somehow bind from this table to each ddl for every row.Here is the column from the gridview. As you can see, I would like to just have a label showing when not in edit mode, and a ddl when the edit button is pressed

<asp:TemplateField HeaderText="During Production Status" SortExpression="DuringProductionStatus">
<EditItemTemplate>

[code]......

Data Bind Into GridView On Specific User Login Details

Feb 21, 2012

I was assigned a task so as to bind the user related data into a grid view on user login. I have got two web pages, one of which contains Login and authentication information. This goes fine. When user was redirected to second page, I need to provide a GridView control where user details should be automatically updated in grid view control in the back ground.I have three different fields which were saved in sql table. particular user details need to be retrieved from the sql table on user login and bind the data to grid view automatically.

Integrate / Bind Date Custom Control

Feb 23, 2009

I'm trying to integrate a custom control that I built into my vb.net project. My control contains 4 text boxes Month, Day, Year, and Time. My database field is a datetime field in SQL Server 2005.I am able to bind the data, but my control doesn't work when a date isn't entered. I'm pretty sure that this is a DBNull issue. I need to be able to insert NULL into the database when a date isn't entered. When a date is entered, I want to insert that date into the database. With the below code, I can't tab out of my control when a date isn't entered.

[Code]...

Bind A List Of Custom Objects To A Listbox Control?

Jun 25, 2010

vs2010 vb.net WPF project

This is an experiment to learn something.

I have a class called logitem

it has a datetime property, and a message as string property

I have declared myLogEntries as List(of logItem)

I have a ListBox.

Ok now what?

I have searched but i am getting lost in all the examples.

I have set the ItemsSource=myLogEntries

I think i need a datatemplate or maybe to specify binding source.

I am doing all this in the wpf form loaded event.

I guess i need a sample code for binding a list of collection to a listbox.

How To Bind Custom Class With No Strongly Typed Properties

Mar 10, 2009

I need a simple class with only one Public property and no Public methods (the final Class will be more complex, but for testing this is all I need). The Property is "Item" and takes a "String" as a parameter. It returns a "String" based on the parameter. I then want be able to add instances of this object to a List or Array, and then Bind it to a Repeater or a ListView......most importantly, I want to be able to then refer to values in my simple Class via the Eval function:
<%# Eval("SomeIDString**") %>**.

I can't Bind at all unless I declare the Item property as the Default property...why?
When I use "Eval", I get an error in the lines of "[some property] does not exists". indeed it doesn't, because everything is accessed via the Item property. it then does works if I replace "Eval" with "Container.DataItem". Is there a way to use Eval instead of Container.DataItem? I would rather not have my class inherit any other classes because I want to keep it clean from supurfulous properties and/or methods.

Are there interfaces I need to implement? Also, the reason I want to use Eval, is that as much as possible, I want to make the use of this Class simple, so the coder doesn't need to worry about special cases. I just want it to work, much like the DataTable Class, but with a much simpler, lighter-weight implementation.

Wpf - Bind To Custom Control Properties Defined In Code Behind

May 14, 2011

I have a custom control defined in code-behind:

Public Class MyControl
Inherits Button
Private _A As String

[Code]......

What code I have to write to bind to those properies?

Asp.net - GridView Error: Object Reference Not Set To An Instance Of An Object

Jun 7, 2012

have a gridview with template fields, one column contains a dropdownlist that should be populated with a sql statement. I have created the grid dynamically and called the rowdatabound in order to access the dropdownlist but I keep recieving the error: Object reference not set to an instance of an object.

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:CommandField EditText="Add" ShowEditButton="True" />

[Code]....

GridView Error: Object Reference Not Set To An Instance Of An Object?

Oct 11, 2010

have a gridview with template fields, one column contains a dropdownlist that should be populated with a sql statement. I have created the grid dynamically and called the rowdatabound in order to access the dropdownlist but I keep recieving the error: Object reference not set to an instance of an object.

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:CommandField EditText="Add" ShowEditButton="True" />

[code]....

Bind A Runtime Object To Control?

Aug 12, 2010

I am developing a fairly large database in VB 2010 as a record keeping. There are 37 tables with some many-to-many relationships in there and some collections too but it all gets loaded into a List of Person object.It is a record keeping database for a youth charity including Personal data, lists of events attended, Medical data, Duke of Edinburgh (UK award scheme) etc The main form is a tabbed form with the linked data from other tables and collection on various tabs

Is it possible to bind a runtime object to a control? if it is possible my life becomes very simple.I can get basic data working with DataSet binding and navigation but the ralationships may prove too fiddly to link as datasets.

Wpf - Object Reference Not Set To An Instance Of An Object When Using Custom User Control

Feb 10, 2012

I have created a custom user control (JCUserControl), and I am using it in the Main Window. And my Main Window has no codebehind. I have this in the JCUserControl codebehind:

Private Sub ImmediateRadioButton_Checked(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles ImmediateRadioButton.Checked
SomeTextBox.IsEnabled = False
End Sub

When I run it, it fails with the NullReferenceException. If I comment out the SomeTextBox.IsEnabled = false, it runs without any problems.

Edit: Found out that I could just check if the radio buttons are loaded before doing whatever I want to do.

Private Sub ImmediateRadioButton_Checked(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles ImmediateRadioButton.Checked
If ImmediateRadioButton.IsLoaded Then
SomeTextBox.IsEnabled = False
End If
End Sub

Bind The Properties Of A Control To A DataTable Object?

Feb 8, 2011

What I want to achieve is to Bind just some of the properties of a Control to a DataTable object.Let's say I have a Label on the Form : "MyLabel1".MyLabel is a Class that inherits from Label and adds a property "ID", an Integer, to the base class.

I want to Bind .Left and .Top properties of MyLabel1 to a DataRow in my DataTable, and I want to see them updating, everytime I change MyLabel1 location on Form. I put description and full code, so everyone can test it in minutes :

I have :

--> A Form, with a DataGridView "DGV" : The DGV is for showing at real time the desired properties of the controls I want to bind ( in this case, just one control : MyLabel1 ).

--> MyLabel Class :
Public Class MyLabel
Inherits Label
Private m_id As Integer

[code]....

Possible To Bind Property LOCATION Of An Object Like Button

Sep 12, 2008

I would like to know if its possible to bind the property LOCATION of an object like button.[code]So that, every time I move either the hscrollbar1 or vscrollbar1 the button1.location will change or moves the object to the location of hscrollbar1.value and vscrollbar1.value. It should happen without setting its value using the SCROLL EVENT.

C# - Custom Message For Object Reference Not Set To An Instance Of An Object?

Dec 1, 2010

We have a huge windows application with poor exception handling. The application throw object reference error from lot of places and the system error message is showing to users as it is using message boxes.

I am looking for a simple solution which can be used to replace this message to something user friendly for the entire application

Forms :: Generate A DataSet And Bind It To A Datarepeater Object?

Aug 30, 2011

This is my first post here so forgive me if I am not following any correct protocols. I am attempting to generate a DataSet and bind it to a datarepeater object. I had been doing this at Design Time and was getting an error message when filling the dataset when the form loaded. So I am basically createing the dataset in my code now when the form loads and binding it to the datarepeater. However, when I attempt to bind the dataset I get a NullReferenceException - even through I know that there are 60 rows of data in the dataset table.

[Code]...

As you can see i have several debug messages in there. I get the error on the last line when setting the datarepeater data source. I try and get data for a specified lot - if it doesn't return any values I create some values in the datatable and add them to the DB. On first load when there is no data this works perfectly. If I then close the form and reload it, it will display fine. However, if I change any of the data (database is updated) and then go back in again, I get the error above.

WebBrowser - Late Bind Object/property Names?

Aug 13, 2010

There are issue with using WebBrowser late bind calls related to object/property names generation.For example:

WebBrowser1.Document.DomDocument.Forms.Myform.mycontrol.Value = "test"

will fail with more than one instance of the WebBrowser control.what actually happen is that mycontrol object become Mycontrol and compiled vb.net application will fail with error

Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND))
at Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet(Object o, Type objType,
String name, Object[] args, String[] paramnames, Boolean[] CopyBack)[code].....

Same code will work with vb6 app with multiple WebBrowser controls

Edit: This code is comipled with: Option Strict Off

Asp.net - Creating A Custom Gridview?

Apr 10, 2012

I would like to create an order form for my ASP.net page (I included an example image below). However I don't know how to approach this. I'm assuming the best method would be a gridview but it would involve two levels of grouping. Other requirements would be be to accept a quantity and then calculate the total price. Can anyone point me to some good books or websites that explain creating custom grid views like this (or maybe a better method than using gridview, I'm open to whatever). I consider myself to be an intermediate programmer in asp.net.

Convert Custom JSON Object To A .NET Object?

Apr 5, 2012

I have a JSON object that looks like this.

{
"Errors":{
"err1":[
//* Array of err1 objects

[code]....

PD: I'm currently using Newtonsoft's JSON.Net library.

Public Sub New(ByVal jsonText As String)
Dim jObject As JObject = jObject.Parse(jsonText )
Dim jErrors As JToken = jObject("Errors")
Dim jS = New JsonSerializer()

[code]....

Have Custom Images In GridView Pagination?

Oct 12, 2009

I am using VB.net for coding.

I am having GridView Control in my application.[code]...

Bind Combobox To Datatable And Object Property Causing Duplicate Bindings

Aug 19, 2011

I'm trying to populate the list of a combobox by binding it to a datatable. Also, I want the selected value of the combobox to be bound to an object property so that when the selected value changes, it's automatically updating the object. However it's causing an error at runtime: "This causes two bindings in the collection to bind to the same property.

Parameter name: binding" I thought binding the dropdown list to a datatable and the selected value to an object were different properties but obviously I'm not getting it right.

Code:

Private Sub PopulateSiteSelect()
With Me.PlanSiteSelect
If _Plan.PlanID <> Nothing And _User.UserID <> Nothing And _Plan.Category <> Nothing Then

[Code]....

Asp.net - Allow Paging On Gridview With Custom Databinding In Place?

Mar 17, 2012

I am a bit lost in concept how to implement what i want to do. I have a gridview, a checkboxlist. I bind the gridview on the page_load. Everytime user choose a checkboxlist, the gridview rebind as well. I have something like this now. This is not the actual code. Thanks so much.

[Code]....

So what do i put here in order to allow paging ? basically, I have 2 datatables in the above example. In the actual code, I have about 5 datatables with 4 checkboxlists. I can't use Datasource control. I need to do it in codebehind as all code already exists.

Gridview Custom No - Unable To Delete A Colmn?

Jun 23, 2009

I create a GridView. It has default three columsn. cant find the way to delete a colmn, i want only 1 column in it.how to do this from design view?

Updating In Gridview - Error "Object Reference Not Set To An Instance Of An Object"

Sep 23, 2010

Am having problem updating in gridview with vb.net, the C# version worked fine but the VB is throwing this error: Object reference not set to an instance of an object. below is my code:

[Code]....

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