.net - Data Not Binding On ButtonClick Or SelectionCHange?
Dec 10, 2010
I have a page with
Page
--UpdatePanel
-- Buttons
-- radiobutton
[code]....
On Page load i bind user controls UC1, UC2 with selected value of radiobutton.But when i select new value in radiobutton it fires selectionchanged event, executes bind method but doesn't update uc1,uc2 values. Similarly I'm trying to get button commandargument when button is clicked and update usercontrols but it doesn't.What could be causing them not to update even when bind method is executed?
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Apr 1, 2010
Problem displaying a graphics form from another forms button click event without losing the XY data plot.
If the Startup form is the GraphWindow form the Graphlib.vb calls create a XY data plot.
Code outline (not everything included):
(Sub GraphWindow_Paint(ByVal sender As Object, ByVal e As Sys�PaintEventArgs) _ Handles Me.Paint)
Call Graphscale(xmin, xmax, ymin, ymax)
Call DrawAxis(10,10)
[Code]...
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Mar 25, 2011
I have an application with a DataGridView and WebBrowser controls. In the DataGridView I load a DataTable using BindingSource. DataTable is just a list of URLs. I use SelectionChanged event on the DataGridView to load a selected URL in the WebBrowser control. The problem I have is that when I minimize form to the tray, it for some reason triggers SelectionChange event multiple times. What's really weird is that if I minimize to the taskbar SelectionChange event doesn't get triggered. It also doesn't get triggered if I load URLs directly to the DataGridView. What triggers SelectionChange and how to get rid of it?
Public Class Form1
Dim URLTable As DataTable = New DataTable("URLs")
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim URLColumn As DataColumn = URLTable.Columns.Add("URL", GetType(String))
[Code] .....
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Apr 26, 2011
im a wrtiting a simple vb.net problem that when a button is clicked it launches the command prompt. all i need it to do is open cmd on a buttonclick. i have used
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code].....
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Oct 16, 2009
I have been trying to make a "skinnable" program, and I am having trouble making it so that when the user clicks a button, it changes to a different image for the background.
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Apr 18, 2010
This was Just an idea.Could serve useful.Anyone know how you could code that?
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Oct 5, 2010
I am having a problem where I am on a text box and try to click a button that will bring up some reports. Since my cursor is still on the text box it doesn't go through the "Leave" and so what I entered into the text box is not saved (this happens in "Leave"). I have read previously not to use "Lost Focus" because it causes problems when you leave the form it triggers the "Lost Focus" on on the fields and just in general to use "Leave" rather than "Lost Focus". Is there a way to force my way through the "Leave"? I also don't know which field my cursor could be on (there are probably 20 text box or combo box fields on this form.
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Jan 6, 2011
how to show the gmap in asp.net webform on buttonclick when i enter destinations in textbox1 and textbox2
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Apr 23, 2010
how to use the VS 2010 IDE tools in a way the Microsofties didn't specifically intend. But since this is something I immediately tried without success.
I have defined a .NET 4.0 WPF Application project with a simple class that looks like this:
Public Class Class1
Public Property One As String = "OneString"
Public Property Two As String = "TwoString"
[Code]....
The expected result was that "OneString" would appear next to "One" and "TwoString" next to "Two" in the running window.
The question is: Why didn't this work? What will work instead? If I put bindings in a DataTemplate, it works. Blend, with its sample data stuff, implied that this should work, but it doesn't.
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Jun 3, 2011
i hve create combobox & text box and add database source to my project...i know how to binding data or load data to combobox using SELECT query..but can i change SELECT to INSERT query cz i wont when i type data into textbox,data will be in database...second..can i binding without add database to project..i mean mydatabase in debug folder..i hve problem binding data if database is not in myproject..
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Apr 2, 2012
Data binding should be an extremely simple thing to manage but I can't find a SIMPLE solution to the following problem.
I have two forms
Form1 contains a 4x4 MSFlexGrid (unfortunately an unmanaged COM object but I can merge cells, which I can't do with a managed Datagrid)
Form2 contains other controls which change the data in the Flexgrid.
I connect the two with a Public 4x4 array. Form2 changes the data in this array. I can update the grid data by reading the array. But how do I bind the Grid to the array so that it auto-updates - which is the whole point of binding isn't it?
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Jul 31, 2010
I have a listbox in my form that gets its values from a data table by data binding. My question is, when the data (row) is loaded it also selects the first line automatically. I do not want this because I want the listbox to select an item only when the user clicks on it. Otherwise, the iteme should ony be listed. Is there a way to manage this?
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Oct 31, 2010
i want to binding excel data to a datagrid without no header, just the data.for example :my excel files consist of 3x3 matriks data in 3x3 excel cell like this
1 2 3
4 5 6
7 8 9
and i want to show all this data on data grid i have tried with some code like this
Dim MyCommand As System.Data.OleDb.OleDbDataAdapter
Dim ds As New DataSet
MyConnection = New System.Data.OleDb.OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0; " & _
[code]....
but the first row of that data ( 1 2 3 ) is not shown up in the datagrid, just the 2nd and the 3rd row that shown up in datagrid?
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Aug 14, 2009
I have a bit of code that reaches out and grabs a series of rows from SQL Server DB. I perform an inner join to get some related table data. In the process I get returned the user id of the creator of the data. I then want to pass this into a query to get back a full name. I am having no luck figuring out how to do just that. If I use the data visualizer I can see the name I am after, I cannot figure out the call to extract it
Bindingsource1.DataSource = GetData("Select * From PURCHASE_ORDERS WHERE PURCHASE_ORDER_NUMBER =" & REQ_NUM.Text)
.DataSource = Bindingsource1
[code].....
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Nov 15, 2009
I'm looking for a line or two of code that will bind a DataSet.Datatable column to a textbox on a Datarepeater?
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Dec 12, 2010
I have produced an Access database and a dataset linked to the database, and am working on a form in VB to enter data to this database. This form was produced by dragging the required fields from the data sources manager to automatically bind to the dataset.
I am attempting to use some radio buttons to allow users to select their gender on a form. I do not know how to take the results of selecting either radio button and upload the user's selection to the dataset, which would then be uploaded to the database.I also attempted to use a ListBox and ComboBox for some other fields, but they do not seem to work as they should, since when I attempted to press the handily provided "Save" button, I was provided with an error to the effect that the boxes appeared to be empty.
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Dec 29, 2009
i make this code to bind combobox and i insert the item to the combobox
With Me.CmbBxEmployeeName
.DataSource = GetAllEmployeeNameBindingSource
.DisplayMember = "Name"[code]....
but this error show ,Items collection cannot be modified when the DataSource property is set.
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Feb 4, 2011
I have developed a form for Windows VB.Net that uses a number of text boxes that are indidivually bound to separate columns in a database. When one of the textboxes (let's call it XYZ.Text) is bound to the database, it prevents the data from any of the other bound text boxes to enter the database. When the binding for this one text box (XYZ.Text) is removed, then all the other text boxes work fine.
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Nov 25, 2009
I'm trying to bind data to a combo box but it does not appear to be working. I've setup the DataSet and the DataSetBindingSource and all this appears to be working, within the form design I can expand the little arrow in the ComboBox control and preview the data. This appears to be working but when the application is run, nothing appears in the drop down box.
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Mar 9, 2010
I have a DataGridView that is bound to a BindingSource. Below this are a group of textboxes that are associated with each column in the DGV. I tried to bind the textboxes to the BindingSource but realized their was no DataSource property for the textboxes. How can I bind them?
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Apr 5, 2010
I have a bit of code which loads data from a stored procedure in MS SQL Server and then loads the data to a datagridview, which works fine. What i want is for the code that connects / loads the data to sit in my Database Class and then everything associated with the datagridview to be stored in my Form but i am having problems passing the contents of the bindingsource over to the Form from the Database Class.
[Code]...
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Apr 13, 2010
I just started working on a small team of .NET programmers about a month ago and recently got in a discussion with our team lead regarding why we don't use databinding at all in our code. Every time we work with a data grid, we iterate through a data table and populate the grid row by row; the code usually looks something like this:
[Code]...
Our team lead was saying that he got burned using data binding when working with Sheridan Grid controls, VB6, and ADO recordsets back in the nineties. He's not sure what the exact problem was, but he remembers that binding didn't work as expected and caused him some major problems. Since then, they haven't trusted data binding and load the data for all their controls by hand.
The reason the conversation even came up was because I found data binding to be very simple and really liked separating the data presentation (in this case, the data grid) from the in-memory data source (in this case, the data table). "Loading" the data row by row into the grid seemed to break this distinction. I also observed that with the advent of XAML in WPF and Silverlight, data-binding seems like a must-have in order to be able to cleanly wire up a designer's XAML code with your data.
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Jul 17, 2010
Is it posible to add Data Bindings to a variable so that the app. is able to count the caracters in in a field.Some thing like this below.I know this code dont work, I need something similar? [code]
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Nov 5, 2009
I am having quite an issue with data bindings in .NET.Some background information, my business object tier is using CSLA v1.0.And _clientObj is passed in as a parameter as a business object that inherits CSLA.BusinessBase Here is the code segment:
Dim nextClient As New ComboBox With { _
.Name = "txtClientAtt" & (ClientBoxes.Count + 1).ToString(), _
.DisplayMember = "FullNameAndID", .ValueMember = "ClientID", _
.Tag = _clientObj}
[code]....
That debug statement does indeed get reached if _clientObj is a pre-existing object with an assigned ID value. How is that possible? I was assuming that adding the data binding should immediately set the .SelectedValue property of the ComboBox if the DataSource object has an initial value.
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Apr 15, 2010
Dim Member As Integer
Member = Val(MemberID.Text)
'create connecetion
[code].....
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Nov 1, 2011
How can I get Var to bind to a data column?
Only for testing purpos I am using Label1 in the code sample below.
Label1.DataBindings.Clear()
Label1.DataBindings.Add("text", HoofGeregteBindingSource, ("Inhoud")
Dim MyVar As String = Label1.Text
[Code]....
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Sep 20, 2010
im doing something wrong in this statement
objDataAdapter.Fill(mydataset,
"Bookingen")
Dim dbbooking
[code].....
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May 6, 2010
I have a form called studentForm which has a studentCombobox, studentTextbox and a studentDatagridView In the constructor of the studentForm I need to bind studentCombobox to the StudentbindingSource of the main form and to bind studentDataGridView to appropriate binding source in the mainForm So that this datagrid view displays all the bookings for the studentID currently selected in studentComboBox
[Code]...
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Oct 29, 2011
is there any way that i could link/bind multiple binding source to only one binding source navigator?
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Apr 25, 2009
I developed an application with old VB form and binding the data from Oracle database into VB form. Actually, I tried to bind the data more than 35000 records in to grid. But, it takes more than half an hour and also form was hanged and there is no output. Can you please let me know the solution to fix it and bind the data without any hang in my application. What are the steps to be followed to fix it?
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