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ASP.Net  datatable to xml

Posted on 2009-05-07
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Last Modified: 2013-12-17
I keep getting an error

System.NullReferenceException: Object reference not set to an instance of an object.
   at WebService.PropertyList() in c:\Users\Amac\Amac WebIT\WebProjects\AmacCMS\App_Code\WebService.cs:line 52

wich is the return line.

Can any one help as to what i'm doing wrong.

i am looking to get the results from a table adaptor return as an xml string;

[WebMethod]
    public string PropertyList()
    {
        HotelsDataSetTableAdapters.hotelsTableAdapter hotelAdaptor = new HotelsDataSetTableAdapters.hotelsTableAdapter();
        HotelsDataSet.hotelsDataTable hotels = new HotelsDataSet.hotelsDataTable();
        hotelAdaptor.FillAllHotels(hotels);
 
        return hotels.DataSet.GetXml();
 
    }

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Question by:amacleod1983
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Expert Comment

by:Obadiah Christopher
ID: 24325272
That's true coz Hotels.DataSet will give u null. It is not inside a dataset.

U'll have to declare a dataset and set the Table[0] of the dataset.

Then u can render the dataset to xml
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Author Comment

by:amacleod1983
ID: 24325329
could you possible supply some sample code?
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Expert Comment

by:Obadiah Christopher
ID: 24325424
The problem is I don't know what is inside

HotelsDataSetTableAdapters

and HotelsDataSet

But this is my guess...

HotelsDataSet dsHotels = new HotelsDataSet();

hotelAdaptor.Fill(dsHotels,"hotels");

return dsHotels.GetXml();
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Author Comment

by:amacleod1983
ID: 24325529
What would you like to know?
Capture.JPG
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Accepted Solution

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amacleod1983 earned 0 total points
ID: 24326883
got it working with this

but there must be a better way
HotelsDataSetTableAdapters.hotelsTableAdapter hotelAdaptor = new HotelsDataSetTableAdapters.hotelsTableAdapter();
        HotelsDataSet.hotelsDataTable hotels = hotelAdaptor.GetAllHotels();
        StringWriter sw = new StringWriter();
        hotels.WriteXml(sw);
        return sw.ToString();

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Expert Comment

by:Obadiah Christopher
ID: 24327481
That would be very much fine...

HotelsDataSet what is this?
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Expert Comment

by:Obadiah Christopher
ID: 24327517
Oh sorry.. That's the dataset.....
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