使用isDBNull()函数出错！

Question

error BC30451: Name 'isdbnull' is not declared.                if not isdbnull(objDataReader("type")) then _typ=objDataReader("type")
                       ~~~~~~~~请问错误原因与解决方法！

Answer 1

http://community.csdn.net/Expert/topic/2932/2932424.xml?temp=.8290522

Answer 2

If Not Convert.IsDBNull(objDataReader("type")) Then

Answer 3

if not (objDataReader.IsDBNull(...)) then _typ=objDataReader("type")