How Do DROP as table with ADO if table exists and Create field if dont exist's

ADO Code:
  1. sqlstr = "DROP TABLE Employees"

error's if it doesnot Exist's


similarly

ADO Code:
  1. ' Create the Employees table.

  2.     conn.Execute _

  3.         "CREATE TABLE Employees(" & _

  4.             "EmployeeId INTEGER      NOT NULL," & _

  5.             "LastName   VARCHAR(40)  NOT NULL," & _

  6.             "FirstName  VARCHAR(40)  NOT NULL)"

error's if EmployeeID or else field's exist's


please help me out !!