C#-pause thread while running application

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I have created 1 application Reading from Excel and displaying those content in Each text box, I have used threading concept to wait(sleep from Given Input) for each line to read and display in text box.

Ques: I want to Pause the thread while running application(During RuntTime) when we click another button, I have tried from my side, but focus is not coming to us.

C#

// To Display in Text box.
private void DisplayText()
        {
        BoomStubAngle:
            int BoomStubAngle = 0;
            for (int i = j; i <= ds.Tables[0].Rows.Count; i++)
            {
                string BSAname = ds.Tables[0].Rows[i][BSA].ToString();
                txt_BSA.Text = BSAname.ToString();
                txt_BSA.Focus();
            }
        BoomForeAngle:
            int BoomForeAngle = 1;
            for (int i = j; i <= ds.Tables[0].Rows.Count; i++)
            {
                string BFAname = ds.Tables[0].Rows[i][BFA].ToString();
                txt_BFA.Text = BFAname.ToString();
                txt_BFA.Focus();
            }
        BoomForeHeadEndPressure:
            int BoomForeHeadEndPressure = 2;
            for (int i = j; i <= ds.Tables[0].Rows.Count; i++)
            {
               string BFname = ds.Tables[0].Rows[i][BFHEP].ToString();
                txt_BFHEP1.Text = BFname.ToString();
                txt_BFHEP1.Focus();
                j++;
              // Thread sleep Time-From User Input
                Thread.Sleep(Convert.ToInt32(Stimer));
            goto BoomStubAngle;
            }
        connclose:
            connExcel.Close();
        }
//??Iam not getting focus to this button in run time when thread is running.??
 private void button2_Click(object sender, EventArgs e)
        {
           
            startstop = false;

            //do
            //{
            //    Thread.Sleep(1000);
            //}
            //while (startstop == true);
            //DisplayText();

        }

What I have tried:

C#

// To Display in Text box.
private void DisplayText()
        {
        BoomStubAngle:
            int BoomStubAngle = 0;
            for (int i = j; i <= ds.Tables[0].Rows.Count; i++)
            {
                string BSAname = ds.Tables[0].Rows[i][BSA].ToString();
                txt_BSA.Text = BSAname.ToString();
                txt_BSA.Focus();
            }
        BoomForeAngle:
            int BoomForeAngle = 1;
            for (int i = j; i <= ds.Tables[0].Rows.Count; i++)
            {
                string BFAname = ds.Tables[0].Rows[i][BFA].ToString();
                txt_BFA.Text = BFAname.ToString();
                txt_BFA.Focus();
            }
        BoomForeHeadEndPressure:
            int BoomForeHeadEndPressure = 2;
            for (int i = j; i <= ds.Tables[0].Rows.Count; i++)
            {
               string BFname = ds.Tables[0].Rows[i][BFHEP].ToString();
                txt_BFHEP1.Text = BFname.ToString();
                txt_BFHEP1.Focus();
                j++;
              // Thread sleep Time-From User Input
                Thread.Sleep(Convert.ToInt32(Stimer));
            goto BoomStubAngle;
            }
        connclose:
            connExcel.Close();
        }
//??Iam not getting focus to this button in run time when thread is running.??
 private void button2_Click(object sender, EventArgs e)
        {
           
            startstop = false;

            //do
            //{
            //    Thread.Sleep(1000);
            //}
            //while (startstop == true);
            //DisplayText();

        }

Posted 17-Aug-16 22:58pm

vinodh muthusamy

Updated 17-Aug-16 23:41pm

v2

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Comments

Mehdi Gholam 18-Aug-16 5:03am

Reading excel, displaying and threads don't make sense.

vinodh muthusamy 18-Aug-16 5:08am

Leave Reading Excel concept, I have asked for How to pause the thread, when application is run time.

Mehdi Gholam 18-Aug-16 5:22am

You use Thread.Sleep().

vinodh muthusamy 18-Aug-16 5:24am

Iam not able to get focus of button in run time

OriginalGriff 18-Aug-16 5:42am

In this case, he's using Thread.Sleep on the UI thread in an infinite loop. :sigh:

Kenneth Haugland 18-Aug-16 5:36am

You should stop using GoTo immediately, they create hard to read and hard to maintain code. Just stop it.

vinodh muthusamy 18-Aug-16 5:49am

If i stop using GOTO Immediate, Will i get focus of form and pause the thread

vinodh muthusamy 18-Aug-16 6:12am

Even i have removed GoTo Immediate. But Still Iam not able to focus on form when runtime.

Ralf Meier 18-Aug-16 7:09am

Excuse me ... but for me the whole code makes no sense.
I suggest the following :
- try to explain what you want to achieve
- show the whole relevant code - for example I don't see where your Thread is instanced and startet
- if you work in a Thread and want to assign new values to controls of the application you should use invoke for this
- your application MUST stay responsiv (that means : it must be able to react at any time)

Ralf Meier 18-Aug-16 7:11am

additional :
If this is "only" a kind of try you should first try it with a Timer (and the Timer.Tick-Event for your method) and not with a Thread ...

Philippe Mori 18-Aug-16 10:44am

Read books, tutorials or documentation on multithreading. It makes no sense to do something like this without a deep understanding on how threading works.

If you want to pause the reading, then you need at least to thread and proper interaction between them. They are many ways of doing that (async/await, background worker or custom threads...).

Philippe Mori 18-Aug-16 10:46am

It absolutly make no sense at all to call Thread.Sleep from a UI thread as your application will stop responding during that whole time.

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OriginalGriff · Answer 1 · 2016-08-17T23:41:00

Solution 1

The problem would probably be that you only have one Thread: the only code you show that includes Thread.Sleep is running on the UI thread (or you would get cross threading exceptions when you access your textboxes) - so if the UI thread is asleep, UI controls don't work. Even if it did, if DisplayText is being called on the UI thread - which it is - then no other UI can function utill it's finished. Which it doesn't do...

That code is pretty poor: why are you loading the same control and setting focus to it repeatedly in a loop? The user won't see any updates until the method exits anyway, which once it starts it won't do. And goto? Why?

Posted 17-Aug-16 23:41pm

OriginalGriff

Comments

vinodh muthusamy 18-Aug-16 6:11am

Based On my requirement, I made my looping structure, But all those looping are differs from excel.

Even after removing Goto Immediate, I couldnt able to focus the form

OriginalGriff 18-Aug-16 6:24am

Read the rest of what I said...

vinodh muthusamy 18-Aug-16 6:38am

Then What is the solution for 1 paragraph, Which you have mentioned.

Whether we can use Timer Control for this issue.

OriginalGriff 18-Aug-16 7:00am

Basically, move the processing off the UI thread and onto a background thread to let the UI do it's thing independently. But you need to think pretty carefully about what you are trying to do and what you want to show the user when first.
At the moment, you don't show him anything for long enough to read even if the UI thread could run to display it to him. So work out what you are trying to do from a user perspective and and then start working out how to do it!