Problem with thread

Hey.

It is my problem. ShowD(and button1) is method of Form1 class.
When we click in button:

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

where:
int g=0;
bool b=true;
public void ShowD()
{
while(true)
{

if(g>1000000000)
{

//show Form2
Form2 a=new Form2();

a.Show();

g=0;

b=false;

}

if(b==true)

{

g++;

}

}
}

I know this code is strange but it is only example.
Unfortunately Form2 wont shows:(