>>Hi,
>>
>>Here is a segment of code:
>>
>>
>>DataSet ds = new DataSet();
>>MyClass.MyMethod( ds );
>>
>>if (ds =!null)
>>{
>> // Error message. Since ds is null. But why the above ds =! null does not catch it?
>>}
>>
>>MyClass.MyMethod( DataSet ds)
>>{
>> // for testing
>> ds = null;
>>}
>>>>
>>Why does the line ds =! null does not catch that the ds is null?
>>
>>I also tried to declare the parameter ds as Out but it does not work either.
>
>To sum up what others have already said :-} :
DataSet ds ;
> // bool b = ds != null; //Won't compile - use of unassigned variable.
> ds = null;
> bool b = ds != null; //false;
> ds = new DataSet();
> b = ds != null; //true
>
> //Using 'out' param
> DataSet ds2;
> b = GetDataSet(out ds2);
where:
bool GetDataSet(out DataSet ds)
> {
> ds = new DataSet();
> return true;
> }Also 'ds = !null' is not valid syntax
Thank you.
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