implicit conversion between '<null>' and 'System.DateTime' error

Question

private DateTime? pApproveDate=null;
pApproveDate =(Reader["ApproveDate"]==DBNull.Value)?null: Convert.ToDateTime(Reader["ApproveDate"]);

Above code is generating the following error during compile time- Type of conditional expression cannot be determined because there is no implicit conversion between '' and 'System.DateTime'

Answer 1

Cast it to DateTime?:

private DateTime? 
pApproveDate=null;
pApproveDate =(Reader["ApproveDate"]==DBNull.Value)?(DateTime?)null:       
    Convert.ToDateTime(Reader["ApproveDate"]);