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Fix form Font

Hi Bro. When I used your source, I found an error in the function fontToolStripMenuItem_Click(),fontToolStripMenuItem_Click,
When I press exit the form still opens a new form. How I fix errors:

private void fontToolStripMenuItem_Click(object sender, EventArgs e){
try
  {
        DialogResult result = fontDialog1.ShowDialog();    // show the Font Dialog
        System.Drawing.Font oldFont = this.Font;    // gets current font
        if (result == DialogResult.OK)
        {
            fontDialog1_Apply(richTextBox1, new System.EventArgs());
        }
        // set back to the recent font
        else if (result == DialogResult.Cancel)
        {
            // set current font back to the old font
            this.Font = oldFont;
            // sets the old font for the controls inside richTextBox1
            foreach (Control containedControl in richTextBox1.Controls)
            {
                containedControl.Font = oldFont;
            }
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Error Information", MessageBoxButtons.OK, MessageBoxIcon.Warning); // error
    }
}

private void fontToolStripMenuItem_Click(object sender, EventArgs e)
{
    try
    {
        DialogResult result = fontDialog1.ShowDialog();    // show the Font Dialog
        System.Drawing.Font oldFont = this.Font;    // gets current font
        if (result == DialogResult.OK)
        {
            fontDialog1_Apply(richTextBox1, new System.EventArgs());
        }
        // set back to the recent font
        else if (result == DialogResult.Cancel)
        {
            // set current font back to the old font
            this.Font = oldFont;
            // sets the old font for the controls inside richTextBox1
            foreach (Control containedControl in richTextBox1.Controls)
            {
                containedControl.Font = oldFont;
            }
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Error Information", MessageBoxButtons.OK, MessageBoxIcon.Warning); // error
    }
}

Error while increasing the font size.

Hi bro. I was learning from your project, and I found a bug while increasing the font size from the increaseStripButton_Click().

Solution:

private void increaseStripButton_Click(object sender, EventArgs e)
        {
            try
            {
                int size = Convert.ToInt32(richTextBox1.SelectionFont.Size) + 1;    // convert (fontSizeNum + 1)
                if (richTextBox1.SelectionFont == null)
                {
                    return;
                }
                // sets the updated font size
                richTextBox1.SelectionFont = new Font(richTextBox1.SelectionFont.FontFamily
                    ,size,richTextBox1.SelectionFont.Style);

                fontSizeComboBox.Text = size.ToString();    // update font size
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message, "Error Information", MessageBoxButtons.OK, 
                    MessageBoxIcon.Warning); // show error message
            }
        }

Good luck!

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