MDI forms Read from text and save to text

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C#

C#4.0

Hello all I got a problem I am trying to open file and read the text to a form ok I open file I enter the text in rich textbox and I hit save now when I open the file again it blank ? this is the problem its not saving the text input so when I open a file in a Frmchild it should display the text.

<pre lang="c#">

  public partial class frmChild2 : Form
    {
        public frmChild2()
        {
            InitializeComponent();
        }
    
    public frmChild2 ( string fileName )
    : this()
    {

    Savefile(fileName);
    }
    private void Savefile ( string fileName )
    {

    string strExt;
    strExt = System.IO.Path.GetExtension(fileName);
    strExt = strExt.ToUpper();
    if (strExt == ".RTF")
    {

    richTextBox1.LoadFile(fileName, RichTextBoxStreamType.RichText);
    }
    else
    {

    System.IO.StreamReader txtReader;
    txtReader = new
    System.IO.StreamReader(fileName);
    richTextBox1.Text = txtReader.ReadToEnd();
    txtReader.Close();
    txtReader = null;
    richTextBox1.SelectionStart = 0;
    richTextBox1.SelectionLength = 30;
    }
    richTextBox1.Modified = true;
    this.Text = "Unit  9  Editor: " + fileName;
    }

    private void btnSave_Click(object sender, EventArgs e)
    {
                  SaveFileDialog savefileDialog = new  SaveFileDialog();
            savefileDialog.DefaultExt = "txt";
            savefileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
            savefileDialog.Filter = "Text Files (*.txt)|*.txt|Html Files (*.htm)|*.htm|Rich Text Files (*.rtf)|*.rtf|All Files (*.*)|*.*";
            savefileDialog.FilterIndex = 1;
            savefileDialog.FileName = string.Empty;
            if (savefileDialog.ShowDialog(this) == DialogResult.OK && savefileDialog.FileName != String.Empty)
            {

                Form frmChild = new frmChild2 (savefileDialog.FileName);
                frmChild = this;
                frmChild.Show();
            }
            else
            {

                MessageBox.Show("Save File request cancelled by user.", "Cancelled");
            }
        }
    } 
}