특정 폼에다가 파일스트림에 있는 값들을 읽어들여서 텍스트로 쓸수있는지 궁금합니다.

using (StreamWriter writer = new StreamWriter("important.txt"))
{
	textbox.text = "회원가입";
	writer.Write(textbox.text);
}

public interface IFormMessage
{
	void Receive(string str);
}

//보내는 쪽
public partial class FormSend : Form, IFormMessage
{
	public FormSend()
	{
		InitializeComponent();
	}
 
	#region IFormMessage 멤버
	public void Receive(string str)
	{
	}
	#endregion
 
	private void button5_Click(object sender, EventArgs e)
	{
		foreach (Form frm in Application.OpenForms)
		{
			if(frm is IFormMessage)
			{
				(frm as IFormMessage).Receive("test");
			}
		}
	}
}
 
 
//받는 쪽
public partial class FormRecv : Form, IFormMessage
{
	public FormRecv()
	{
		InitializeComponent();
	}
 
	virtual void Receive(string str)
	{
		label1.text = str;
		회원정보.text = str;
		using (StreamWriter writer = new StreamWriter("important.txt"))
		{
			Message.Text = CalculateTotal(checkbox1.Checked).ToString("c");
			writer.Write(Message.Text);
		}
	}
}