empty path name is not legal Error

im working on a notepad application when i click on open or save command n after click on cancel in opendialoge box i got error.

Code:

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private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();
            dlg.Title = "Open";
            dlg.Filter = "Text Documents(*.*)|*.*|All Files(*.*)|*.*";
            dlg.ShowDialog();
            richTextBox1.LoadFile(dlg.FileName);
 
        }
 
        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog dlg = new SaveFileDialog();
            dlg.Title = "Open";
            dlg.Filter = "Text Documents(*.*)|*.*|All Files(*.*)|*.*";
            dlg.ShowDialog();
            richTextBox1.SaveFile(dlg.FileName);
        }

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You should check your ShowDialog(); calls return values in order to find out which button was actually pressed.

Something like that

Code:

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......................................
// Show dlg as a modal dialog and determine if DialogResult = OK.
if (dlg.ShowDialog() == DialogResult.OK)
{
...............................
}

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thx