Here's the situation:

I have this BaseClass:

public abstract class BaseDataSet : DataSet
{
// Constructor and other stuff here

	public virtual bool Validate()
	{
		return true;
	}

}

then i have this derived class:

public class SomeDataset : BaseDataSet, IDataSet
{
// Constructor and other stuff here

	public override bool Validate()
	{
                bool ret = this.DoSomeProcessing();
		return ret;
	}

}

And finally, in some other object, i have this code:

public bool save( IDataSet ds )
{
    if (ds.Validate()}
      { //save it }

The problem:

Only The code in the BaseDataSet class is executed for Validate() thus always return true. It should execute the derived SomeDataset.Validate()

Am i missing something ?