Adding Web User Control To A Class Library

open the project file(*.vbproj) in a text editor

find this line or add it: (replace [ with <, ] with >)[ProjectTypeGuids]{349c5851-65df-11da-9384-00065b846f21};{F184B08F-C81C-45F6-A57F-5ABD9991F28F}[/ProjectTypeGuids]
Add it below [ProjectGuid]

The project type guids for c# are as below.
{349c5853-65df-11da-9384-00065b846f21};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}