This method uses System.Security.Permissions.SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have System.Security.Permissions.SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to System.Runtime.InteropServices.Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.