If you are hosting the Spread Windows Forms component as a user control on a Web page in Microsoft Internet Explorer (IE), you should make security permission adjustments by setting the level of trust.

For Microsoft IE

• In Microsoft IE, select Tools->Internet Options->Security and select Trusted Sites. Click the Sites button and add the Web site where your user control resides (for example, http://localhost).
• In Microsoft Windows, select Start->Settings->Control Panel and select Administrative Tools. Select Microsoft .NET Framework Configuration. In the .NET Framework Configuration window, select Runtime Security Policy and click Adjust Zone Security. In the Adjust Zone Security wizard, answer the first screen (which computer it applies to) and in the next screen, click Trusted Sites and slide the indicator to give that zone Full Trust. Finish the wizard by clicking Next.