Private Sub FindErrors()
    Dim table As Data.DataTable
    Dim row As Data.DataRow

    If DataSet1.HasErrors Then

        For Each table In DataSet1.Tables
            If table.HasErrors Then

                For Each row In table.Rows
                    If row.HasErrors Then

                        ' Process error here.
                    End If
                Next
            End If
        Next
    End If
End Sub

private void FindErrors() 
{
    if (dataSet1.HasErrors)
    {
        foreach (DataTable table in dataSet1.Tables)
        {
            if (table.HasErrors)
            {
                foreach (DataRow row in table.Rows)
                {
                    if (row.HasErrors)
                    {
                        // Process error here.
                    }
                }
            }
        }
    }
}

private void Find_Errors()
{
    if (dataSet1.get_HasErrors())
    {
        // for each table
        for (int i = 0; i < dataSet1.get_Tables().get_Count(); i++)
        {
            DataTable table = dataSet1.get_Tables().get_Item(i);
            
            if (table.get_HasErrors())
            {

                // for each row
                for (int j = 0; j < table.get_Rows().get_Count(); j++)
                {
                    DataRow row = table.get_Rows().get_Item(j);

                    if (row.get_HasErrors())
                    {
                        // Process error here.
                    }
                }
            }
        }
    }
}