The following code example demonstrates how to set the Font property of a button to a new bold-style font using the FontStyle enumeration. This example is designed to be used with Windows Forms. Create a form containing a button named Button1 and paste the following code into it. Associate the Button1_Click method with the button's Click event.

 Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click
    If Not Button1.Font.Style = FontStyle.Bold Then
        Button1.Font = New Font(FontFamily.GenericSansSerif, _
            12.0F, FontStyle.Bold)
    End If
End Sub

private void Button1_Click(System.Object sender, System.EventArgs e)
{
    if (Button1.Font.Style != FontStyle.Bold)
            Button1.Font = new Font(FontFamily.GenericSansSerif,
            12.0F, FontStyle.Bold);
}

private:
   void Button1_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      Button1->Font = gcnew System::Drawing::Font( FontFamily::GenericSansSerif,12.0F,FontStyle::Bold );
   }

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

.NET Framework

.NET Compact Framework

Reference