invoke a form , from a thread

[dariush]

hey guys

how do i can invoke a form, from a thread, which in that thread i have a

while(true){}

in this while i want to show a form in some circumstance, i did like this

{
           .
           .
           .
           .
           //the conditions to call search form is alright here 
           search frm=new search();
           frm.Invoke(new _Form(_Form_1), new object[] { frm });
           .
           .
           .
           .
}

        delegate void _Form(Form frm);
        void _Form_1(Form frm)
        {
            frm.Show();
        }

but this gives me this exception, which i not know what is?

$exception {"Invoke or BeginInvoke cannot be called on a control until the window handle has been created."} System.Exception {System.InvalidOperationException}

how to solve this?

tnx in advance

[kungpaoshizi]

try a format like this, you'll have to pull out some of the extra, but this forces the re-calling of the invoke if the form is not ready (or perhaps not created as in your case)

delegate void PassRT(string line, int num);
public void RT1(string line, int num)
{
if (richTextBox1.InvokeRequired)
{
PassRT x = new PassRT(RT1);
richTextBox1.Invoke(x, new object[] { line, num });
}
else
{
if (num == 1)
{
richTextBox1.Text = richTextBox1.Text + "\n" + line;
richTextBox1.SelectionStart = richTextBox1.Text.Length;
richTextBox1.ScrollToCaret();
}
else
{
richTextBox1.Text = richTextBox1.Text + line;
richTextBox1.SelectionStart = richTextBox1.Text.Length;
richTextBox1.ScrollToCaret();
}
}
}