The ComVisibleAttribute attribute determines how COM clients access managed code.COM visibility can be set for an entire assembly and then overridden for individual types and type members. If the attribute is not present, the contents of the assembly are visible to COM clients.

If you want the assembly to be visible to COM clients, apply the attribute and set its value to true.

Add the attribute to the assembly. If you do not want the assembly to be visible to COM clients, apply the attribute and set its value to false.

Example
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using System;

[assembly: System.Runtime.InteropServices.ComVisible(true)]
namespace DesignLibrary {}