Unassigned Varibles?

privatevoid menuItem15_Click(object sender, System.EventArgs e)

{

MenuItem mnuItem = (MenuItem) sender;

mnuItem.Checked = !mnuItem.Checked;

FontStyle fsStyle;

switch (mnuItem.Text.Replace("&",""))

{

case "Bold":

fsStyle = FontStyle.Bold;

break;

case "Italic":

fsStyle = FontStyle.Italic;

break;

case "UnderLine":

fsStyle = FontStyle.Regular;

break;

}

rtbText.SelectionFont =new Font(rtbText.SelectionFont.FontFamily,

rtbText.SelectionFont.Size,

rtbText.SelectionFont.Style^fsStyle);

I getting the error saying my fsStyle is not assigned? Why is that i thought i assigned them to the bold italic, and underline types