Windows Form DownloadingMenager - Windows Forms Discussion Boards

I think you missed his point. Why should anyone do your work for you and just hand it over for free?

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Print Direct To Windows Printer (EPOS Receipt)

The Master said, 'Am I indeed possessed of knowledge? I am not knowing. But if a mean person, who appears quite empty-like, ask anything of me, I set it forth from one end to the other, and exhaust it.'
― Confucian Analects

Thank you but i need Dot matrix printer code above code is POS code (Receipt).I'm using Dot matrix rolled paper

The code is no different for a dot matrix printer.

The only thing that would change would be what you send to the printer.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

I KNEW you would say that.

The Master said, 'Am I indeed possessed of knowledge? I am not knowing. But if a mean person, who appears quite empty-like, ask anything of me, I set it forth from one end to the other, and exhaust it.'
― Confucian Analects

I have a created a WinForms User Control class (C# WinForms project in and Visual Studio 2017) that has (3) controls in it: A label, textbox, and button. Next drag-and-drop that User Control onto a WinForm, and it appears with each of the child controls. All appears good, for now..

Next I decide to make some changes in the User Control custom class, so I open it in the visual designer, move the button to a new location and change the size and change the caption of the button and save my changes. Rebuild. Next I open the Form that uses an instance of the User Control, and I do NOT see the updates I made to the User Control class.... The button is at the original location and original caption and original size.

Surely, the creates of this platform should now that anyone would expect these changes to be applied to the instance of the control wherever it is used in the app.

Please tell me I am missing something very basic here to make this work like true inheritance should...

I made short a video here to demonstrate this issue:

Video: Custom User Control on WinForm

I am creating an application to do utility billing. I want to be able to add notes/comments to each customer/meter. I'm a newbie so I am asking what is the best way to enter and store these notes. Right now I have a access database, I have a table dedicated to just the notes. I am storing date and time stamp as to when the note was added, the customer number and the note. Each note is stored in a record for each customer. I have a textbox on the windows form that I enter and display the information.

Is this the best way or is there a better/easier way. Since I am new I might be overlooking something.

With my code now I am having trouble combining the records for each customer and displaying them in the textbox. If the way I am doing it works then I will post other help on that issue.

Thanks in advance...

Hello guys , I try to create a Download Manager but when I was running my project and I click in start download button after that this error happen.

______________________________________________________________________________________________________

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
   at DotnetDownloader.frmnewdownload.btnstartdownload_Click(Object sender, EventArgs e) in E:\VisualProject(CSharp)\DownloadMenager\DotnetDownloader\frmnewdownload.cs:line 72
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
DotnetDownloader
    Assembly Version: 1.0.0.0
    Win32 Version: 1.0.0.0
    CodeBase: file:///E:/VisualProject(CSharp)/DownloadMenager/DotnetDownloader/bin/Debug/DotnetDownloader.exe
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

-----------------------------------------------------------------------------------------------------------

frmnewdownload.cs:line 72

You want us to guess what's at that line? Need an NDA?

"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal

E:\VisualProject(CSharp)\DownloadMenager\DotnetDownloader\frmnewdownload.cs:line 72

You have a reference variable at that line which has not been initialised, so is therefore a NullReference.

Have you tried putting debugger at this line and see why you getting no value?

modified 20-Sep-20 21:01pm.

I have a tree created at design time with 3 root nodes and 3 levels 3x3x3 =39 nodes as the default.

The nodes can be dynamically recreated.

When I cleared the nodes then recreated them, I tried looping through to add properties to the nodes of each level including their relevant context menu name.

<pre lang="text">
	Private Sub RedoTree_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles RedoTree.Click

		treeLoad()
		treeExecutive.ExpandAll()
		restoreTP()
		treeExecutive.Nodes(0).EnsureVisible()

	End Sub
<pre>
	Sub restoreTP() '				renew treenode properties

		Dim s As String, l As Short

		treeExecutive.Update()

		For Each treenode In treeExecutive.Nodes
			s = treenode.Name
			l = Len(s)
			treenode.ForeColor = Color.GhostWhite

			If treenode.Text <> s Then treenode.ForeColor = Color.Black

			Select Case l
				Case 1
					treenode.NodeFont = New Font("Arial Rounded MT Bold", 10.8)
					treenode.ContextMenuStrip = CMSRoot
				Case 2
					treenode.NodeFont = New Font("Arial", 10.2)
					treenode.ContextMenuStrip = CMSTree
				Case Else
					treenode.NodeFont = New Font("Arial Narrow", 9)
					treenode.ContextMenuStrip = CMSTree
			End Select

		Next

	End Sub

The root nodes are number 1-3, then 11,12,13 .... 111,112,113 Total is 39 nodes

ONLY THE ROOT NODES ARE RECOGNISED AND DEALT WITH.

All the child nodes are ignored as if they don't exist

Am bogged down on this and would appreciate any help Confused | :confused:

Demac

The TreeView's Nodes property[^] only returns the root nodes. Each node has its own Nodes property[^] containing its child nodes.

To iterate through all nodes in the tree, you will need a recursive method. For example:

VB.NET

Sub restoreTP()
    treeExecutive.BeginUpdate()
    Try
        restoreTP(treeExecutive.Nodes)
    Finally
        treeExecutive.EndUpdate()
    End Try
End Sub

Sub restoreTP(ByVal nodes As TreeNodeCollection)
    Dim s As String, l As Integer
    For Each treenode As TreeNode in nodes
        ...
        
        restoreTP(treenode.Nodes)
    Next
End Sub

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Hi
thx Richard for that info

Not familiar with recursion, but now you've helped me improve my understanding of treeviews.

I did circumvent the problem by updating node properties as they are created.
I can post that code if it might help others.

demac Wink | ;)

We are writing a combo box custom control using MS text box and list view. We are in a position where we need to provide token (close) option for the options that will be displayed in the combo box? So do you have any suggestion? Refer the below image for better understanding of the requirement.

Google Images[^]

WinForms or WPF? There's articles on CodeProject for both that show how to draw something as the selected item. Start there Smile | :)

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Can You help me with this please:

ReactiveUI-WinForms bind combo datasource after selecting another combobox - C# Discussion Boards[^]

Please do not do this. Post your question in one forum only.

I'm really sorry, it does not happen again, I was wrong on the topic, that's why I did it

Hello there. I started learning new c #. I'm doing a project. Similar to devexpress windowsmail. But the designs in my project didn't interfere with the truth. colors, dynamic designs, background colors etc .... How can I design a design like devexpress? it is an eye-catching design wowwwww ..... Please help me please.

If you are new to C#, I would wait before I tried to do something more complex like this unless you are a DevExpress customer, in which case, you should have all the sourcecode you need available.

This space for rent

You're right, Pete. thanks for the advice. to consider

This is the same "question" you posted in September:
make a design similar to windows mail in visual studio - C# Discussion Boards[^]

The answer has not changed.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Hi there
I have two forms called form1 and form2 . In form2 I have 10 trackbar . I want to change values in form1 when I change form2 trackbars . How can i do this ? can i select a void in form1 for form2 trackbars ?

Assuming Form1 creates and displays the Form2 instance, the simplest option would be for Form2 to raise a custom event when the values change. Form1 would subscribe to that event, and update its own values accordingly.

Alternatively, Form2 would need a reference to the instance of Form1, and would call a public method on the form to update the values. You'll probably want to use an interface for the reference so that the implementation isn't tied to a single concrete class.

Or you could use the Mediator pattern. Form2 would publish a message when its values changed. Form1 would subscribe to that message and update its values accordingly.

Transferring information between two forms, Part 1: Parent to Child[^]
Transferring information between two forms, Part 2: Child to Parent[^]
Transferring information between two forms, Part 3: Child to Child[^]

Mediator Design Pattern[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer