Dynamic TextBoc in C#

Question

2.33/5 (2 votes)

See more:

Hi,
I have simple formApplication script that contains button and some TextBoxs.
I want when click on button, one textbox shows some numbers.
How I can make that dynamic.

C#

private void button1_Click(object sender, EventArgs e)
        {
            txt3.Text = "";
            for (int i = 0; i <50; i++)
            {
                Random random = new Random();
                int randomNumber = random.Next(100, 150);
                txt3.Text = randomNumber.ToString();
            }
        }

Now it waits to loop finished and shows latest number.
I want it shows all numbers in TextBox.
Regards,

Posted 29-Aug-13 0:55am

Rezame

Add a Solution

Comments

[no name] 29-Aug-13 7:09am

txt3.Text += randomNumber.ToString();

Have you thought about simply buying a decent book on programming and reading it? Just a thought.

Rezame 29-Aug-13 7:56am

I have C# books, and know about this: txt3.Text += randomNumber.ToString();
But first tried next come here to ask.

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2013-08-29T01:08:00

Solution 1

Try:

C#

txt3.Text += randomNumber.ToString();

You may want to add some spacing or newlines (if this is a multiline text box)

Posted 29-Aug-13 1:08am

OriginalGriff

Comments

Rezame 29-Aug-13 7:44am

Thanks.
It shows all variable together.
I want it shows separately during loop.

OriginalGriff 29-Aug-13 8:34am

You can't - or not like that. The problem is that little-or-no-time occurs between successive iterations of the loop, and while there is something you can do about that using Thread.Sleep, that freezes your UI thread as well, so the display doesn't get updated and you still can't see the interim results.

To do this, you really want to include a Timer control and set the TextBox content at a specific interval rather than using a loop at all. (The other solution is to use a separate thread, but that complicates things a lot, and makes it harder to actually show the value in the textbox, because UI controls can only be accessed from the thread that created them, not any other thread you might create. A Timer is a simpler solution)

Rezame 29-Aug-13 8:38am

I set timer function that shows every second only one number.
But it write all numbers in same time.

OriginalGriff 29-Aug-13 9:54am

Then take the loop out, and move just the line
txt3.Text = randomNumber.ToString();
to be the whole of the Timer.Tick event. No other code needed!

hypermellow · Answer 2 · 2013-08-29T01:08:00

OK, try this:

C#

private delegate void DisplayTextBoxDelegate(int i)

private void button1_Click(object sender, EventArgs e)
{
     txt3.Text = "";
     var thdDoTextBoxStuff = new Thread(DoTextBoxStuff);
     DoTextBoxStuff.IsBackground = true;
     DoTextBoxStuff.Start();
}

private void DoTextBoxStuff()
{
     for (int i = 0; i <50; i++)
     {
         Random random = new Random();
         int randomNumber = random.Next(100, 150);
         txt3.Invoke(new DisplayTextboxDelegate(UpdateTextBoxValue), randomNumber);
         Thread.Sleep(500);
     }
}

private void UpdateTextboxValue(int iValue)
{
    txt3.Text = iValue.ToString();
}

Again, I've not tried the above - but it should get you moving in the right direction.

Rezame · Answer 3 · 2013-08-29T03:36:00

Solution 3

Need add this:

C#

Application.DoEvents();

Next it works.

Posted 29-Aug-13 3:36am

Rezame

Comments

OriginalGriff 29-Aug-13 9:55am

Bad idea. Trust me on this, if you need DoEvents, then you have made some spectacularly bad decisions! :laugh:

Rezame 29-Aug-13 11:04am

Can you say me what is problem with DoEvents ?

OriginalGriff 29-Aug-13 11:54am

From the MSDN page: http://msdn.microsoft.com/en-us//library/system.windows.forms.application.doevents.aspx

"Caution noteCaution
Calling this method causes the current thread to be suspended while all waiting window messages are processed. If a message causes an event to be triggered, then other areas of your application code may execute. This can cause your application to exhibit unexpected behaviors that are difficult to debug. If you perform operations or computations that take a long time, it is often preferable to perform those operations on a new thread. For more information about asynchronous programming, see Asynchronous Programming Model (APM)."

For a better explanation, see here:
http://stackoverflow.com/questions/5181777/use-of-application-doevents
I cannot say it better!

Rezame 29-Aug-13 11:56am

Thanks.
Can you say me what is best method for shows number?
Or any other Tool or function that print number in Main form?

OriginalGriff 29-Aug-13 14:12pm

For the application the OP posted about, a Timer is the obvious solution - threading is overkill!

For other applications it will depend on exactly what you are trying to do, there are many, many options when it comes to Threads and thread related operations.

Dynamic TextBoc in C#

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0

Existing Members

...or Join us