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Index ‹ Windows Forms ‹ Windows Forms Data Controls and Databinding
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- Windows Forms Data Controls and Databinding BindingSource updateHi!
I have a problem with the binding.
I have a textBox who is binded on an object representing a "User". When i click on a button, it show me a list of User that can be binded on my textbox. So, when I double-click on a item in the list, I want to update the binding of my textBox with the new item selected. The object is updated, but the binding does not refresh automatically.
How can I solved this problem
p.s.: sorry for my poor english...
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- Windows Forms General Webbrowser preventing enter firing
I have created an MDI which can display 2 types of child windows: a) windows form with textbox control (to display text files) and b) windows form with embedded axWebBrowser. If I only display multiple child windows of the file type, then I can click on any part of the window to bring that child window to the front. However, as soon as I also display a webBrowser type window, I can only change which child window is on the top by clicking on the window title bar, regardless of what "type" of window it is i.e. clicking on any other part of the form will not bring that window to the top although I can input data into that child window, even though it remains at the back. Once I have shown a webbrowser type window, the other child windows continue to exhibit this strange behaviour even if I close the webbrowser child.
Strangely, this behaviour is machine dependent - it works fine on one pc but displays the behaviour described above on another. Both are running IE6. I have checked all my internet options and cannot see any obvious difference.
Is anyone able to make any suggestions of how to correct this behaviour or why it is machine specific. I have searched the internet extensively but seen nothing similar reported anywhere.
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- Windows Forms General how to create a resizable custom controlI need to create a resizable custom control. I inherit from usercontrol and create an handler for the OnPaint event, then I need to detect when cursor is over the edge of the control (a simple rectangle) and if the left button is pressed and the mouse dragged, resize the control.
I read about using drawgrabhandle method but I'mnot sure what this method does.
Can someone help me
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- ClickOnce and Setup & Deployment Projects Web Publishing with multiple connection strings
Hi,
We have two environments available to all users, one for testing and user training, pointing to a database and a live environment pointing to another database. A third is on the developer machines and we all have our own DB running locally. I publish to two different locations for users (live and test) and two links on the users desktop point to either environment, which need different connection strings.
Here's my problem:
Before publishing, I change the connection string to say "Data Source=testserver", but when users start the test app it will fail and the log says:
**********
http://d9k2cn1j/Golfbreaks.TheClubhouse/Test/Golfbreaks.TheClubhouse_1_0_0_6/Golfbreaks.TheClubhouse.exe.config did not succeed.
**********
But if I had left the connection string as "Data Source=(local)", which is where my Dev DB is, it works fine.
Also, if I change the .config file from "(local)" to "testserver" after a publish in the source directory , the database still points to (local)!!!
Any ideas how I could somehow tell the publisher to use a different .config file depending on where I'm deploying to
Many thanks for your time if anybody could help us.
Sean
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- Windows Forms General Bug or By Design In UserControl
The following is my test control.....I does not know why DesignMode propery alway got false, but on OnHandlerCreated Method I got True......Why
public class TestControl:UserControl
{
public TestControl()
{
MessageBox.Show(this.DesignMode.ToString());
}
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
MessageBox.Show(this.DesignMode.ToString());
}
}
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- Windows Forms Data Controls and Databinding Assign Value to unbound DataGridViewComboBoxColumn
Hi, i have a problem vith comboBoxColumn. i want to assign a value
to unbound comboBox cell and when i change its index want it to fire an event. I use CellFormatting event to assign value like below
private void dataGridView1_CellFormatting(object sender,DataGridViewCellFormattingEventArgs e)
{ //(unVisibleSourceColumn is unvisible and belongs to bound dataset)
if(dataGridView1.Columns[e.ColumnIndex].Name.Equals("comboColumn")) {
e.Value = Convert.ToString(dataGridView1.CurrentRow.Cells["unVisibleSourceColumn"].Value)}
}
At that point, assign unVisibleSourceColumn's value to combo just for new row . Registered SelectedIndexChanged event for combo in EditingControlShowing . The code in combo_SelectedIndexChanged is below
private void combo_SelectedIndexChanged(object sender, EventArgs e)
{
UpdateDataSetsUnVisibleSourceColumnValue()
// here just updates value of currentRows unVisibleSourceCells value for bound dataset
}
After this, the program seems to enter infinite loop because of CellFormatting (P4 CPU %100 and crashes)
My question is, why it calls CellFormatting continuously except just one time and if anyone have suggestion for that case:
datagridView is bound to a dataset, an unbound DataGridViewComboBox is added, want to add first value
to combocell according to sourceColumn in dataset and when changing index of it, updating sourceColumn value. Thanks to everyone..
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IamHuM
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 Posted: Windows Forms Data Controls and Databinding, Read a value of Datgrid cell... |
Top |
Hi,
How i can read a value of a cell in DataGridView...
I have 2 different types of columns in my application . If user selects values of all the 2 columns of 1st row & then he presses a button...so on that button click event i have to display value on my form using 3 lables. My columns are of textbox(1st column) & combobox(2nd column) type.
So how i can read these user selected values & display it on form with lable on button click event...
Thanks in advance,
Vinay
Windows Forms2
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ahmedilyas
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| Posted: Windows Forms Data Controls and Databinding, Read a value of Datgrid cell... |
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well you can read the values by accessing the row index and cell columnName/Index:
MessageBox.Show(this.theDataGridView.Rows[index].Cells[ColumnName].Value.ToString());
but now in order to go through each row/cell they chose, take a look at the SelectedRows and SelectedCells property, then perhaps go through each cell they chose/each row they chose and show the value
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vinay.p
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| Posted: Windows Forms Data Controls and Databinding, Read a value of Datgrid cell... |
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Thanks for your immediate reply...
Can i select 1st value of each cell in my comboxcolumn on loading of form... I want user to see the 1st value of each cell in my ComboBoxColumn when he loads that form...
Thanks once agagin...
Vinay
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Index ‹ Windows Forms ‹ Windows Forms Data Controls and Databinding |
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- Windows Forms General ToolStripMenuItem Shortcut on culture change
Hi
When I change the culture of my application I refresh the menu item's text. But how can I change the shortcut text which stays in the old language.
I tried to remove and set again "ShowShortcutKeys", the "ShortcutKeys" and "Visible" with no success. Invalidate() does also not help. The old language is kept.
Is it really necessary to create a new ToolStripMenuItem object
Thank you for assistance.
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- Windows Forms General OnClick
Hello,
I'm having a problem with a custom control derived from usercontrol. After I put up (and close) a modeless dialog box and then switch parent forms the control no longer generates or receives OnClick events. Other events like MouseDown MouseUp still work.
I'm wondering how the OnClick event is generated (I don't think it is a standard windows message derived event) and if anyone has any ideas how it could be blocked.
Thanks,
Jeff (Moderator: Thread moved to this forum for better responses)
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- Windows Forms General only allow user to select value 1 through 4 from listbox,textbox....?
I want to have the user select/input 6 values. They choose/enter 1,2,3, or 4.
I would like them stacked in a vertical fashion.
These values relate to a character string in a listbox
What is the best way to have these values lined up and limit the choices to 1,2,3, or 4
Thank You
ex: (listbox on the left, value on the right)
_____________
| Some string | 1
| Some string | 1
| Some string | 4
| Some string | 3
| Some string | 2
| Some string | 1
-----------------------
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- ClickOnce and Setup & Deployment Projects making a setupfile
I am making a program for a client of ours in Visual Basic Express.
The idee is that they put there daily incomes in the program and they send the database back to us.
I have tried to make a setupfile through publish.
However when I install the program on an other pc, I can't seem to find the database.
Does anyone know where this database should be
I have been searching for any mdf-files, but I can't seem to find the one I need.
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- Windows Forms General TreeView in User Control does not display initialized data
Hi -
I've been working on this most of the morning... I've created a Windows Form User Control that has a TreeView control. This user control is dropped onto a tab control in my main form. I initialze a TreeView node in the main form constructor as follows ...
MyUserControl myControl = new MyUserControl();
In the user control constructor, I create a node as follows...
MyUserControl() {
treeView1.Nodes.Clear();
treeView1.BeginUpdate();
treeView1.Nodes.Add(new TreeNode("Hello, node"));
treeView1.EndUpdate();
}
The node that I create - "Hello, node" - does not display in the treeView of my user control on my main form. I did two "sanity" checks... First, I can populate the user control treeView1 with manual data from the smart tag. This shows up on the main form (although I expected to see my "Hello, node"). Second, I created a "treeView2" in my main form. I used the same code to load "Hello, node" as above and this worked.
Setting a break at treeView1.EndUpdate() shows "Hello,node", as expected, but again, this does not show up on my main form user control. I've tried various techniques from other googles -
myControl.Enabled = false;
myControl.Enabled = true;
myControl.Refresh();
- all no joy.
Thanks,
Mike
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- Windows Forms Data Controls and Databinding cannot view data in datagridview
I've tried using the code below to view data from a select query in a datagridview control (along with several other methods) with no success. It is slightly adapted from a BOL example. The bindingnavigator appears to be reading the bindingsource ok (shows correct number of records) however, the datagridview remains blank.
Private Sub GetData(ByVal selectCommand As String, ByVal connectionString As String)
Dim VwTblDataAdapter As SqlDataAdapter
Try
' Create a new data adapter based on the specified query.
VwTblDataAdapter = New SqlDataAdapter(selectCommand, connectionString)
' Create a command builder to generate SQL update, insert, and
' delete commands based on selectCommand. These are used to
' update the database.
Dim commandBuilder As New SqlCommandBuilder(VwTblDataAdapter)
' Populate a new data table and bind it to the BindingSource.
Dim table As New DataTable()
table.Locale = System.Globalization.CultureInfo.InvariantCulture
VwTblDataAdapter.Fill(table)
Me.BindingSource2.DataSource = table
' Resize the DataGridView columns to fit the newly loaded content.
Me.DataGridView2.AutoResizeColumns( _
DataGridViewAutoSizeColumnsMode.AllCellsExceptHeader)
Catch ex As SqlException
MessageBox.Show( "To run this example, replace the value of the " + _
"connectionString variable with a connection string that is " + _
"valid for your system.")
End Try
End Sub
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- ClickOnce and Setup & Deployment Projects validate a serial number from a DLL I am trying to get my project to validate a serial number using a DLL or EXE file I have written instead of the included algorithm, but I have no clue how to get the Customer Information dialog to read from a DLL or EXE file or if it is even possible. I have searched through other threads and haven't found anything extremely useful. I am using Visual Basic .NET and Visual Studio .NET 2003. Can anyone help me with this
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- Windows Forms General How can I create a tree of control on my Form ?
Hello.
Well, I have a question.
I want to create a tree of my custom controls on my From, whick must looks like a standard tree view (I want to say that I will be able to show or hide nodes and leafes of my tree). What class, standart control or other things can help me to do it
Thanks for help.
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- Windows Forms General Key-Based List Control? Hi Everyone,
I was just curious. Is there a Windows Forms List control out there that is "key-based". Basically, I want to display all of my Dictionary items in a List on a form, with the key of each item of the Dictionary being how I access each item in the List.
I've looked at the ListView and ListBox, but it doesn't look like either one would do the trick.
Thanks in advance
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- Windows Forms Data Controls and Databinding List Of Objects As DataSource for DataGridView and DataGridViewComboBoxColumn
Hi all,
I have a DataGridViewComboBoxColumn:
Dim cbCol As New DataGridViewComboBoxColumn
With cbCol
.DataSource = myCatalogoPOS.SubMenus() 'Private _submenus As New List(Of SubMenu)
.ValueMember = "Clave"
.DisplayMember = "Nombre"
End With
------------------------------------------------------------------------------------------------------------------
The DataSource for cbCol is a List of this Class
Public Class SubMenu
# Region "Miembros Privados"
Private _clave As Integer
Private _nombre As String
-----------------------------------------------------------------------------------------------------------------
Also I have a DataGridView(dgvMenu) with its DataSource Property set to:
Using myCatalogoPOS As New CatalogoPOS
With Me.dgvMenu
.DataSource = myCatalogoPOS.Platillos() 'Private _platillos As New List(Of Platillo)
'Insert the cbCol
.Columns.Insert(4, cbCol)
.....
-------------------------------------------------------------------------------------------------------------------------
The DataSource for dgvMenu is a List of this Class
Public Class Platillo
# Region "Miembros Privados"
Private _clave As Integer
Private _nombre As String
Private _nombreboton As String
Private _nombrelargo As String
Private _taxid As Integer
Private _routing As Integer
Private _costo As Double
Private _modificadores() As String
Private _submenu As Integer
Private _precio As Double
.....
---------------------------------------------------------------------------------------------------------------------
How can I make the default value (of every row) for the cbCol of the dgvMenu to be the value of the SubMenu(_submenu) Property of the Platillo Class
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- Windows Forms Data Controls and Databinding creating a dataview
I need to take a look at the content of some DataTable(s) I download from SQL Server in a purely debug situation. I decided to use DataView object for it. I improvised the following code:
DataViewManager mng = new DataViewManager ( sqlDatSet );
DataView dtview = mng.CreateDataView ( sqlDatSet.Tables[jj] );
dtview.BeginInit ( );
The jj integer is the index of a particular DataTable in a DataSet and is found in a for loop.
I expected a primitive form with a Table View displayng my records to show up. Is it not a reasonable expectation Nothing like this happened. The DataView remained an internal object. If I cannot get a good look at what is present in the tables I download I will be facing a cumbersome task of printing the stuff out via Console.WriteLine () or DEBUG.
I hope you understand my simple problem. Please help.
Thanks you. (Moderator: Thread moved to this forum for better responses)
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- Windows Forms General Putting text on an image on a form
I am an old C/C++ programmer that is trying to learn C# and .net. I need to take text from a .txt file and display it on a form in graphics. I eventually need to save the image to a .jpg file.
I created a picturebox (is this the right object to use ) on the main form, opened the .txt file and read in one line at a time. Now I need to put each line of the text into the picturebox area in graphics mode to display it on the screen in the same order as the text in the file.
Any suggestions
Thank you
OldCDude
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