WebSecurity Compile time error

WebSecurity Compile time error

I am registering user for this i initialize my database in HttpGet method
but i am facing this error
The name websecurit does not exis in current context asp
Here is my code.
[HttpGet]
public ActionResult Registeration()
{
if (!WebSecurity.Initialized)
{
WebSecurity.InitializeDatabaseConnection("MVCLoginConStr",
"Authentication",
"UserId", "FirstName", autoCreateTables: true);
}
return View();
}