Store update, insert, or delete statement affected an unexpected number of rows (0). error in MVC3

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ASP.NET

MVC

I am working on MVC 3, I am trying to delete a record from the table, but when I click on the delete button I am getting the following error at the "test.Savechanges();" from the below code.

SQL

Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.

This is my controller code:

public ActionResult Delete(tblEmployee viwEmp)
{
   test.Entry(viwEmp).State = System.Data.EntityState.Deleted;
   test.SaveChanges();
   return RedirectToAction("CRUDS");
}