Stephane,

Put public methods/properties in your base DataClass that you call from your sub-classed DataSets. Something like this:

	public interface IDataSet
	{
		void FillWithXml(string XML);
	}

	public class XmlConverter
	{
		public void ImportXml(DataSet Data, string XML)
		{
			StringReader sr = new StringReader(XML);
			Data.ReadXml(sr, XmlReadMode.InferSchema);
			Data.AcceptChanges();
		}
	}

Then in your sub-classed DataSets:

public class Ar_CustMaster_DataSet : Ar_CustMaster, IMyDataSet
{
  private MyBaseDataClass.XmlConverter Converter = new MyBaseDataClass.XmlConverter();

  public void FillWithXML(string XML)
  {
    this.Converter.ImportXML(this, XML);
  }
}

~~Bonnie




>Thanks Bonnie,
>
>That's what i did but the problem with interface is i have to cut & paste the implementaion code to all my derived dataSets since the code is the same for all. It would be much easier to simple derive from a base class containing all the common code. Looks like nothing is easy in .NET!!
>
>
>>Stephane,
>>
>>You don't want to mess with the generated code. I recommend using an Interface and then create a sub-class from your typed DataSet. Something like this:
>>

>>public interface IMyDataSet
>>{
>>  void MyDataSetMethod();
>>}
>>public class Ar_CustMaster_DataSet : Ar_CustMaster, IMyDataSet
>>{
>>  public void MyDataSetMethod()
>>  {
>>    // whatever code
>>  }
>>}
>>

>>
>>~~Bonnie
>>
>>
>>>I am trying to figure out how i can make the generated typed datasets from VS 2003 us my dataSet base class instead of the Syste,.Data.DataSet base class.
>>>
>>>The genarated code produce this:
>>>

>>>    public class AR_CustMaster : DataSet {}
>>>

>>>
>>>I need the dataset generator to produce this:
>>>

>>>    public class AR_CustMaster : MyDataSet {}
>>>

>>>
>>>I know i can go in the generated .cs file and manually change it but as soon as the dataset is regenerated, my changes are lost.
>>>
>>>Is there any way to make the change permanent ?
>>>
>>>Thanks.