Get DataGridView CheckBoxCell State
Dec 24, 2009
I add one checkboxcolumn in design time in the page load I set the value false like this
DataGridView1.Rows(0).Cells(0).Value =
False
Then in the CellContentClick Event I get the current value of Checkboxcell then change the state of the checkboxcell according the value like this
Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
If e.ColumnIndex = 0 AndAlso e.RowIndex > -1 Then
Dim ched As Boolean = DataGridView1.Rows(e.RowIndex).Cells(e.ColumnIndex).Value
[Code] .....
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Jun 30, 2010
I have a dgv with some checkbox columns. When I load data in the dgv, and I want to check in the cellcontent_click event, whether an another cell value (this is a checkbox cell too) is true or false, I get the error that the operator = is not defined for
dbnull value and for boolean. F.e.:
If
dgvegyenijogok.Rows(e.RowIndex).Cells(3).Value = True
And
dgvegyenijogok.Rows(e.RowIndex).Cells(4).Value = True
And[code]......
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Feb 11, 2011
How do I get the value of checkboxcell in DataGridView control?
the value,TrueValue,FalseValue always return as null... in the column I set the TrueValue to "true" and the FalseValue to "false" this is the first time i'm trying to access this control so I must doing something wrong here.
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Dec 2, 2010
i am developing an application with vb.net incorporating a Datagridview control. i know that we can make a particular column as checkbox column or text colum or button column. Is there any property/method to make one cell as checkbox cell, other as text cell and another as buttton cell for particular column within the DGVW?
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Dec 9, 2009
how can I get the checkboxcell value for each row on the click of a button?
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Dec 13, 2011
Is there a simple way to restore the state of DataGridView1 to it's original Form_Load state?
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Feb 3, 2011
I have a DataGridView control in a .Net application that contains a checkbox column. I would like for the user to be able to edit the checkboxes. The issue that I am running into is that I cannot detect the state of the checkbox after the user checks it.
If the checkbox was originally checked, then it will return checked as soon as the DataGridViewCheckBoxCell gets focus. But, if I click on the checkbox again and unchecks it, then it still returns checked. From that point on, it will always return checked regardless of the actual state of the checkbox until it looses focus and gains it again.
Likewise, if the checkbox was originally unchecked, then when it gets focus it will return unchecked in the click event regardless of what the state of the checkbox actually is.
Here is my code.
Private Sub grdTemplates_CellContentClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles grdTemplates.CellContentClick
[Code].....
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Jun 4, 2011
I have created an Unbound DataGridView. It has has 4 Columns Name, Last Name, Picture, CheckBox. I would like to do change the checkbox's enabled state true or false (editable or not) at the time I add the row
Not its checked state :) and would also like to change image that is placed in the Image column cell during the add row.
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Jun 21, 2010
is it true that if the AllowEdit property is set to false, any DataGridViewComboBoxColumn that my DataGridView has will be in a "disabled state" (will not allow the user to change the value of the DataGridViewComboBoxColumn) AND there is no way i can make it in an "enabled state" unless i switch the AllowEdit to true?
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Nov 3, 2011
I need codes for vb.net Getkeystate Function() without using any DLL.I'm beginner for API Conversion from vb to vb.net.In vb6 they using user32 DLL.In Vb.Net i need to call Getkeystate Function without that "User32.dll" function. can any one post me the codes without using dll?
Is there any way to get key state without using that dll Getkeystate function in vb.net..? if equivalent is any one know means show me that codes.that codes should be work with in .net framework.[code]...
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Mar 19, 2011
How do I detect the state of the INS-key on the keyboard? MS somehow forgot to implement it in My.Computer.Keyboard...
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May 1, 2012
In a VB.net app, I have several checkboxes created with regular ASP controls, i.e.asp:CheckBox ID="cb3" runat="server" Checked="true" />I'm trying to implement a "Select all/none" functionality but I'm having a few problems. The Javascript is not changing the state of the checkboxes in Internet Explorer (v9). I tried debugging with IE's dev tools and the checkboxes are definitely getting their checked property set to true. (Also tried setting to "checked".) Here is the JS:
function setCheckboxes( state )
{
var inputs = document.getElementsByTagName("input");
[code]......
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Feb 3, 2011
I'm looking for some smart ideas on how to quickly find all usage of session state within an existing asp.net (MVC) application.
The application in question was the subject of outsourced development, and has been running fine in production. But we recently realised that it's using InProc session state rather than (our preferred route) StateServer.
In a small scale test, we switched it over to StateServer, and all worked fine. However, when we deployed to production, we suddenly experienced a large number of errors. I'm not sure if these errors were caused by this change (they were actually complaining about database level problems), but removing the change allowed the application to function once again (this may have just been because it caused a recycle to occur).
So before I try switching it again, I'd like to perform a thorough audit of all objects being placed in the session (I'd previously taken a quick look at a couple of controllers, and they seemed fine). If I had full control over the code, this is the kind of place where I'd just comment out the class (to compile and find the various ways of reaching the session class), then comment out the accessors, hit compile, and visit each error. But I can't do that with built in .NET framework types.
I decided to try using Reflector. I've analyzed the "Used By" for each of the following:
System.Web.HttpSessionStateBase.set_Item(String, Object) : Void
System.Web.SessionState.HttpSessionState.set_Item(String, Object) : Void
System.Web.SessionState.HttpSessionState.set_Item(Int32, Object) : Void
[Code]....
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Apr 12, 2011
I have a label's value that is posted back from a previous page and I want to use this label to do a simple calculation in the current page, but when I do the calculation the page (refreshed) the value of this label and automatically deleted the value (Since there would be no value in postback when it refreshed).
Here is the code behind file:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Label2.Text = Request.Form("Hidden1")
End Sub
and here where I want to use the label
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim Stotal As String
Stotal = Val(Label2.Text) * 10
Label3.Text = Stotal
End Sub
How can I save the value in the page via view state or any other method?
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Apr 23, 2011
when they say static classes should not have state/side effects does that mean:
static void F(Human h)
{
h.Name = "asd";
[code].....
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Aug 15, 2011
Here is, basically, how my application works:
When windows starts, my app starts. Whenever my app is running, it hides the desktop, taskbar, etc... When a button is clicked in my application ("Start program"), then my application will set its visible property at false and another application will start.
Everything seems to work perfect except I need a way for my application to set its visible property back to true, but only once the other application that was started earlier, is closed (no longer running.)
My thought was that I could use a timer to check for the applications state every so many seconds:[code...]
I have 2 concerns with this:
1. A timer checking this every few seconds will invoke unneeded stress on a computer since they are running for sometimes very long periods of time.
2. There is a better way to accomplish this that doesnt rely on a timer.
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Aug 25, 2011
Why does this not work?
[Code]...
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Dec 6, 2009
My ISP's DNS server goes down all of a sudden sometimes. This is very annoying while surfing the internet. So, I'm trying to make an application which has the following characteristics :
Runs in system tray
Pings the server periodically
Notifies when the server becomes unreachable/active
Now, I know that the existing workarounds are to use OpenDNS or ping <IP Address> -t in command prompt. I don't want to use them... the reason being that the former gives much higher pings than my DNS & for the latter, I'll have to switch windows.
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Jun 24, 2012
I can create a checkbox array as follows
Code:
For n = 0 To 13
With (chkboxarray(n))
.Tag = n + 1 ' Tag of button
.Width = 35 ' Width of button
[code]....
But when I run the program the checkboxes only display 2 states (they do work as 3 states). what I am missing to display the "Indeterminate" state?
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Apr 13, 2010
im trying to figure out how on earth to set a checkbox on a DataRepeater row to true. Nothing ive tried seems to work. Ive searched all over, and all i seem to find is ways to check the state and in ASP.
Text boxes would be:DataRepeater1.CurrentItem.Controls(
"textbox1").Text = textbox2.Text.However, checkboxes wont work in this way. DataRepeater1.CurrentItem.Controls("Checkbox1").Checked = True"Checked is not a member of windows.forms.control" - ive tried various things in order to set it to true/false, but whatever i do doesent work. I expect its going to be something stupidly simple, but its those things that annoy the most IMO!
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Feb 3, 2011
I'm trying to detect the state of num lock but haven't had any luck. using a windows 7 x64 machine.
Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As System.Windows.Forms.Keys) As Short
'num lock check timer
[Code]....
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Jun 7, 2011
form 1 has a list of checkboxes on itform 2 needs to check if one of the form 1 checkboxes is checked.
texton is a value passed from a function parameter of type string
If (Form1.Controls.Item("checkbox" & texton).checkstate" = True) Then
'Do Something
[code]......
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Jul 27, 2011
How do I get the Compressed state of a file[code]...
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Jun 27, 2009
How to get dialup connection state in VB.NET 3.5?
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Sep 2, 2009
How do I get the current state of Num Lock in VB.NET?
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Aug 20, 2011
I'm developing a program (VB.NET Form) that has printing function, then i have to alert user when an error occurred such as paper out, paper jam or etc. I found that .NET has WIN32_Printer class use for retrieve printer information and status. I can get printer status (Idle, Printing) correctly except offline, but for DetectedErrorState... always get 0 if printer has no problem and 2 if any problem found. (from reference 0 means Unknown and 2 means No Error) How can i get printer state correctly? Is this related to printer manufacturer or their driver? Because their application can alert correctly, i guess that driver never return value to WIN32 Class.
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Jun 8, 2011
I am making a little program for the Game "Flight Simulator X" and I need to monitor the Process state of the Program.My Main Question is How do you manage a Process so on a Label you can set maybe an If...Then...End If Statement to tell it what to say.
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Feb 14, 2011
Recently I was handling a TCP/IP server-client window-based program in VB.NET. But in VB.NET. after I include the winsock on it, it cannot check the state. Normally, in VB6, to check the state is as below: If
[Code]...
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May 26, 2012
In a VB.net app, I have several checkboxes created with regular ASP controls, i.e. <asp:CheckBox ID="cb3" runat="server" Checked="true" />I'm trying to implement a "Select all/none" functionality but I'm having a few problems. The Javascript is not changing the state of the checkboxes in Internet Explorer (v9). I tried debugging with IE's dev tools and the checkboxes are definitely getting their checked property set to true. (Also tried setting to "checked".) Here is the JS:
View 8 Replies
Jan 23, 2009
how to maintain state of textbox while postback
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