Re: Can I access a user form object programmatically? - C# Discussion Boards

Re: Running a new form inside BackgroundWorker DoWork method

Laex26-Oct-07 11:18

26-Oct-07 11:18

Hi Dave, thanks for the info.

So, the appropriate thing to do would be do would be:
- do all the main processing in DoWork function
- Send the required information to displayed by UI via. ProgressChanged or RunWorkerCompleted; unlike what i did by creating a Form or any other control inside the thread
- The UI controls stay in the main thread in this way.

Thanks.
Laex

Reflection

ilango gandhi26-Oct-07 6:52

ilango gandhi

26-Oct-07 6:52

How can we implement the Reflection concept in C# Application?

---
Regards
ilango gandhi

Re: Reflection

pmarfleet26-Oct-07 6:59

pmarfleet

26-Oct-07 6:59

By writing C# code that utilizes the classes in the System.Reflection namespace.

Paul Marfleet

Re: Reflection

il_masacratore26-Oct-07 12:17

il_masacratore

26-Oct-07 12:17

Hi,
Here you have some Reflection Samples

Visit my blog at http://dotnetforeveryone.blogspot.com

Can I access a user form object programmatically?

humblepgmr26-Oct-07 6:50

humblepgmr

26-Oct-07 6:50

I did this in VB and would like to do this in C# now.

UserForm1.Controls("chkbx_ManProp_" & CStr(j)).Value = True

any ideas how to convert this to C# in a windows form application?

Thanks

Re: Can I access a user form object programmatically?

Anthony Mushrow26-Oct-07 7:08

Anthony Mushrow

26-Oct-07 7:08

Crazy VB code, so you want to access the property of a control on another form?

If so, add a method to the forms class that will modify the control. Then you can call the method.

My current favourite word is: Waffle

Cheese is still good though.

Re: Can I access a user form object programmatically?

humblepgmr26-Oct-07 8:22

humblepgmr

26-Oct-07 8:22

I wrote the VB app in a short amount of time, so that snippet was pretty much done on the fly ;o

the property of the control(s) that I want to access is within the same form.
Unfortunately, there isn't a direct correlation of VB and C# methods so I'm not sure where to look.

I was thinking about something like this:

start a loop
Application.getControlbyName("object_name_as_string" & integer_variable).value = false
integer_variable++;
end loop

in essance what this should do is programmatically loop through all the controls with similar naming conventions, and set its member value to false.

Any suggestions / alternate ideas on how to accomplish this in c#???

Thanks in advance
Humble.

Re: Can I access a user form object programmatically?

Michael Potter26-Oct-07 8:35

Michael Potter

26-Oct-07 8:35

ControlName.PropertyName = NewValue;

Not sure why you want to loop through the control list when the above template should work within the same form.

Of course, you could do the looping but it takes a bit more skill and would look something like the code below. I would stick with The Undefeated's advice.

public static Control FindControl(Control root, string nameToFind)
{
    Control retval = null;
    foreach (Control c in root.Controls)
    {
        if (c.Name == NameToFind)
        {
            retval  = c;
            break;
        }
        retval = FindControl(c, nameToFind);
        if (retval != null)
        {
            break;
        }
    }
    return retval;
}

Re: Can I access a user form object programmatically?

humblepgmr26-Oct-07 10:30

humblepgmr

26-Oct-07 10:30

Heh. Agreed that it's easier just to assign a value to a control.
However, I've got 20 controls that need to be assigned the same value.
I declared the control names with the express notion that I would be able to loop through all of them and assign with the same value.
I guess I can modularize it and put it in a method, but I'm slightly surprised I"m not able to do what I could do with VBA code!

:P

Re: Can I access a user form object programmatically?

Michael Potter26-Oct-07 12:00

Michael Potter

26-Oct-07 12:00

That is because it is inefficient. There is little reason to loop through all controls everytime you want to update a specific one.

VB tends to save lines of code not cpu cycles.

Client is Not Receiving Data though Server sends it

nayabsiddiqi26-Oct-07 5:40

nayabsiddiqi

26-Oct-07 5:40

Hi,
do any one know if
ConnectedClientSocket.Send is sending while we are working on Server

On Client application, through Begin Send and Receive (async calls), it's not getting any data.

What could be the reason? any solution?

thanks

Determination and faith are the only keys !

Is there a method to change a text box back to it's original state?

humblepgmr26-Oct-07 5:19

humblepgmr

26-Oct-07 5:19

I'm programming in C# but I thought this would be a VB question
i'm not sure how to do this, but assume I've got a text box that has a properties.
The properties dynamically change throughout the program, upon request, is there a method through system way to get the text box (or any checkbox, radio button group, label etc.) to change back to its original state?

Re: Is there a method to change a text box back to it's original state?

Dave Kreskowiak26-Oct-07 7:03

Dave Kreskowiak

26-Oct-07 7:03

No. The controls do not keep a record of their initial state are application startup.

You have to write a method that will reset all the properties of a control to a state that you want. Call this method when you want to reset the textbox.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: Is there a method to change a text box back to it's original state?

Luc Pattyn26-Oct-07 12:34

Luc Pattyn

26-Oct-07 12:34

Hi,

alternatively you can hide the original Control, then call an "init" method, which
clones the Control, adds it to its parents.Controls and makes it visible.
When you want the original back, remove the Clone, and call "init" again.
So it is always a clone that is shown, gets modified, and the original is never touched.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this months tips:
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Re: Is there a method to change a text box back to it's original state?

Dave Kreskowiak26-Oct-07 12:36

Dave Kreskowiak

26-Oct-07 12:36

Though I've never had to reset controls back to a known state, (I tend to destroy and create entire forms instead) that's a trick I'll have to put in the bag.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: Is there a method to change a text box back to it's original state?

Luc Pattyn26-Oct-07 13:17

Luc Pattyn

26-Oct-07 13:17

I made sure my bag of tricks is an ArrayList, so it accepts all kinds of objects,
and is only limited by total amount of memory available. Big Grin | :-D

Come to think of it, it more resembles a Heap, difficult to enumerate...

Luc Pattyn [Forum Guidelines] [My Articles]

this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google

Re: Is there a method to change a text box back to it's original state?

Dave Kreskowiak26-Oct-07 14:35

Dave Kreskowiak

26-Oct-07 14:35

Yeah, same with mine. Well, not really a digital heap, but a huge pile of sticky notes. Big Grin | :-D

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

converting a windows C# application to web OCX

samy10026-Oct-07 4:40

samy100

26-Oct-07 4:40

hi,

i have a windows project in C# that uses some DLL i wrote in different projects.

i want to make this application to run from the web page on the local computer(ActiveX,OCX).

how can i do it?

thanks,

Samy

how can I read 4 hex characters from a textbox and put them in a uint?

Big Ralph26-Oct-07 4:35

Big Ralph

26-Oct-07 4:35

I need to read 4 hexadecimal chars from a textbox and put them into a Uint
how can I do that?

BiG RaLpH

Re: how can I read 4 hex characters from a textbox and put them in a uint?

Ravi Bhavnani26-Oct-07 4:41

Ravi Bhavnani

26-Oct-07 4:41

See UInt32.TryParse()[^]

/ravi

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Re: how can I read 4 hex characters from a textbox and put them in a uint?

Big Ralph26-Oct-07 5:03

Big Ralph

26-Oct-07 5:03

I need to see if I can change the hex 2.

ie:
textbox2.text = "1212abab"
the uint returned must be 1212 and another abab.

BiG RaLpH

Re: how can I read 4 hex characters from a textbox and put them in a uint?

Luc Pattyn26-Oct-07 6:53

Luc Pattyn

26-Oct-07 6:53

Hi,

you could:
1. use long.TryParse() and then split the long in upper and lower halfs.
2. split the string in two parts, and use int.TryParse() on each of them.

The second method may be more difficult since it may have to cope with varying string lengths
when leading zeroes are omitted in the string.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google

Re: how can I read 4 hex characters from a textbox and put them in a uint?

zafersavas26-Oct-07 23:58

zafersavas

26-Oct-07 23:58

You can use
uint num = Convert.ToUInt16(textBox1.Text, 16);
If the textbox contains more than 4 letters and if you want to change each 4 letters in to their uint value, you should first write a text splitter which is very simple with string.substring() function.

Best Regards
Zafer

Error when running WinForm App

Fayu26-Oct-07 4:17

Fayu

26-Oct-07 4:17

I have an application that i have deployed using winforms. I have many users using this application and it works for every1 except one person!!!! I cannot isolate the problem. She gets the following error:

EventType:clr20r3
P1: admin.exe
P2:1.0.0.0
P3:464caceb
P4:admin
P5:1.0.0.0
P6: 464caceb
P7:42
P8:4c
P9:system.nullreferenceexception

I want a line number or something that give me a damn hint on where the null exception is occuring. I received this info from the event viewer. HEELLPP!!!

Re: Error when running WinForm App

Justin Perez26-Oct-07 4:21

Justin Perez

26-Oct-07 4:21

After doing a quick search on google, and selected the top result, I got This result[^]. See if that helps you out.

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