Hi,
I try to do simple thing.. ( I see a education video.. and do the same, but no success)

Create new project
Create new master page.
Add DIV and ContentPlaceHolder to the master page.

Open Default.aspx
Set the MasterPageFile="~/mypage.master"

Page repaint - all fine.
Delete HTML code - leave only header
Click on ContentPlaceHolder and select "Create Custom Content".

It creates someting like

<asp:Content ID="Content1" runat="server" contentplaceholderid="MyContent">
</asp:Content

Now.. problem begins.. I type inside something like "Hello World" - start page - nothing..

Check "Source" for contentplaceholder - there nothing written between asp - tags..

What do I wrong?

Thanks
Denis