Create new form in thread (Csharp)

While you are somewhat right in that using Form.Show on a separate thread doesn't generally work, it's not for the reasons you're thinking.

When you do a new thread such as in:

Thread t = new Thread(OpenNewForm);
t.Start();

whenever that method completes (in this case OpenNewForm), the thread will "go away" killing anything within it. Because you're using .Show(), the method will complete.

If however, you used .ShowDialog(), the thread will not finish until that thread is closed.

And, even though I know this works, I just tested it like so:

private void button1_Click(object sender, EventArgs e)
{
  Thread t = new Thread(OpenNewForm);
  t.Start();
}

private void OpenNewForm()
{
  Form1 newForm = new Form1();
  newForm.ShowDialog();
}

Doing this works...you can even close the main form and the application won't close until newForm is closed and the thread has been allowed to complete.

The way your code is currently stated, you're going to create a new form infinitely. This will result in many hundreds of forms instantly created before your system crashes, and we see you back here asking why your thread is creating so many forms.

Your thread method should instantiate the form, and unless you've got code that you're not showing us, all this is going to do is create a bunch of empty forms.

Finally, the way you're instantiating and showing the form should work fine. What problem are you having?

No at all ,isn't infinitely ,,,because you have not seen all the code ,please Just answer me about how can I Open new Form in thread , try it and tell me , you can't do "Form.show()" in thread , and if you do "Application.Run(Form)" the rest of code does not continue the execution I think you know that,Just I have tried a lot,but no solution,it's my graduation's project ,,,