How can I call the controls of other class?

[Thin July]

How can I call the controls of other class? they are same level within only one namespace..
but I can't ...So what should I do?
by namespace declaration or by taking inheritance? or how?

[GaryTexmo]

You can only call what's publicly exposed by a class. The controls are usually defined privately so you'll need to open up some access. While you certainly could make the control itself public, it's considered a best practice to only expose functionality you choose, thus preventing people from messing with your classes in unintended ways.

The most basic example here would be a public property... lets say you had a form with a button on it and you wanted to change the text on that button, you might do the following:

public class MainForm : Form
{
  private SubForm m_subForm = new SubForm();

  ...

  public void SomeMethod()
  {
    m_subForm.ButtonText = "NO";
  }

  ...

}

public class SubForm : Form
{
  private Button m_button = new Button();

  ...

  public SubForm()
  {
    m_button.Text = "OK";
  }

  // ButtonText property
  public string ButtonText
  {
    get { return m_button.Text; }
    set { m_button.Text = value; }
  }

  ...

}

That's the simplest way... for more detailed information one of our experts, Curtis Rutland, has done an excellent writeup, you can read it here:

http://bytes.com/topic/c-sharp/insights/904861-how-get-data-form1-form2-any-other-forms