C#

public class Form1
{
  pb m_pb;

  public Form1()
  {
    m_pb = new pb(this);    
    //...
  }

  //...
}

public class pb
{
  Form1 guid;

  public pb(Form1 p_ref)
  {
    guid = p_ref;
    guid.progressBar1.Value = 100;
    //...
  }
  
  //...
}

namespace WindowsApplication1<br />
{<br />
	public class Form1 : System.Windows.Forms.Form<br />
	{<br />
		private bool _done = false;<br />
		private ProgressBar _pb = new ProgressBar();<br />
		private Form2 _form = new Form2();<br />
		private System.Windows.Forms.Button button1;<br />
		private System.Windows.Forms.Button button2;<br />
		private int _value=0;<br />
<br />
		public Form1()<br />
		{<br />
			this.Size = new System.Drawing.Size(300,300);<br />
<br />
			this.button1= new Button();<br />
			this.button1.Location = new System.Drawing.Point(8, 240);<br />
			this.button1.Name = "button1";<br />
			this.button1.Click += new System.EventHandler(this.button1_Click);<br />
<br />
			this.button2= new Button();<br />
			this.button2.Location = new System.Drawing.Point(100, 240);<br />
			this.button2.Name = "button2";<br />
			this.button2.Click += new System.EventHandler(this.button2_Click);<br />
<br />
			this.Controls.Add(this.button1);<br />
			this.Controls.Add(this.button2);<br />
<br />
			this._pb.Location = new Point(0,0);<br />
			this._pb.Width = 100;<br />
			this._pb.Minimum=0;<br />
			this._pb.Maximum=100;<br />
		}<br />
<br />
<br />
		private void button1_Click(object sender, System.EventArgs e)<br />
		{			<br />
			_form.Show();<br />
<br />
			if (!_done)<br />
			{<br />
				_form.Controls.Add(_pb);<br />
				_done=true;<br />
			}<br />
		}<br />
		<br />
		private void button2_Click(object sender, System.EventArgs e)<br />
		{	<br />
			if(_value<100)<br />
				_value +=10;<br />
			else<br />
				_value=0;<br />
<br />
			_pb.Value=_value;<br />
		}<br />
<br />
		[STAThread]<br />
		static void Main() <br />
		{<br />
			Application.Run(new Form1());<br />
		}<br />
<br />
	}<br />
}