Prevent self closing html tags in .NET

I create an input element, it will self close. How can I prevent this?

<asp:TextBox id="txt1" runat="server"></asp:TextBox

SOLUTION

1. Tools
2. Options
3. Text Editor
4. HTML
5. Formatting
6. Uncheck the box for Auto insert close tag

There are many other option for HTML formatting.

If you are using Visual Studio 2010, you can go to :
Tools > Options > Text Editor > HTML > Formatting > Tag Specific Options