Microsoft Sharepoint Products and Technologies Resource Kit eBook

1020 Part IX: Maintaining a Server in Windows SharePoint Services
code shows a basic RenderWebPart implementation that makes sure the TextBox and
Button controls are rendered.
protected override void RenderWebPart(HtmlTextWriter output)
{
EnsureChildControls();
RenderChildren(output);
}
F37xr03.bmp
Figure 37-3 A Web Part with child controls
This concludes the section about creating child controls on a Web Part. A Web Part
is a special kind of ASP.NET Web control, so if you need more information about this
topic you can read more on developing ASP.NET Web controls on MSDN.
Web Part Caching
One of the factors that separate a great Web Part from an average Web Part is performance.
You can enhance performance by caching data. You should not use the
ASP.NET Session state in Web Parts because the current implementation of the Safe-
Mode parser does not allow Session state to be defined at the page level as is possible
with the ASP.NET parser. This means the administrator can enable Session state
for all Web Part Pages or for none of them. Enabling Session state for all pages
degrades server performance.