Is it OK or not really a good code

string strOrderNo = this.txtOrderNo.Text;
                        int? OrderNo;
                        if (strOrderNo.Equals(String.Empty))
                            OrderNo = null;
                        else
                            OrderNo = Convert.ToInt32(strOrderNo);

                        _dtOrder = biz.Find(OrderNo, this.dtgStartDate.Value, this.dtgEndDate.Value);

>>Hi everybody,
>>
>>Sorry, how can I convert this
>>

>> _dtOrder = biz.Find(this.txtOrderNo.Text, this.dtgStartDate.Value, this.dtgEndDate.Value);
>>

>>My biz object has this signature Find(int? OrderNo, datetime? StartDate, datetime? EndDate)
>>
>>I tried to add (int?) and (int) in front of the OrderNo.Text, but it doesn't compile.
>>
>>Thanks a lot in advance.
>>
>>UPDATE. This seems to compile
>>
>>_dtOrder = biz.Find(Convert.ToInt32(this.txtOrderNo.Text), this.dtgStartDate.Value, this.dtgEndDate.Value);
>>
>>Am I right?
>
>If this.txtOrderNo.Text is empty, Convert.ToInt32() will throw an exception. You'll probably want to add some code which checks that before you try converting it. You'll have to decide if empty means 0 or it means null.