C#

private const int BufferSize = 4096;

public class Form1 : Form
{
  internal Label label1;
  private Button button1;
  public Form1()
  {
    label = new Label();
    button1 = new Button();
    // Initialize...
    button1.Click += new EventHandler(button1_Click);
  }
  private void button1_Click(object sender, EventArgs e)
  {
    using (Form2 form = new Form2(this))
      form.ShowDialog(this);
  }
}
public class Form2 : Form
{
  private TextBox textBox1;
  private Button button1;
  private Form1 form;
  public Form2(Form1 form)
  {
    this.form = form;
    textBox1 = new TextBox();
    button1 = new Button();
    // Initialize....
    button1.Click += new EventHandler(button1_Click);
  }
  private void button1_Click(object sender, EventArgs e)
  {
    if (form != null) form.Label.Text = textBox1.Text;
  }
}

Image ButtonPic = null;
Stream ImgStream=null;
int ImageHeight,ImageWidth,ButtonY,ButtonX=0;

//previous button
ImgStream = this.GetType().Assembly.GetManifestResourceStream("MiniP3.PlayerPrevious.bmp");
ButtonPic = Image.FromStream(ImgStream);
btPrevious = new Button();
btPrevious.Image=ButtonPic;
btPrevious.Size = ButtonPic.Size;
btPrevious.ImageAlign=ContentAlignment.MiddleCenter;
ImageHeight = ButtonPic.Height;
ImageWidth = ButtonPic.Width;
ButtonY = (int)(pnButtons.Height-ImageHeight)/2;
btPrevious.Location = new Point(ButtonX,ButtonY);
this.btPrevious.Click += new System.EventHandler(this.PreviousClick);
pnButtons.Controls.Add(btPrevious);

string reportName = "MyWebApp.Reports." + listBox1.SelectedValue;
ReportDocument report = Activator.CreateInstance(reportName, "MyWebApp.dll");
report.SetDataSource(dataSet1);