I have a text box and button in as seen in the code below. I need to apply validation such that
tT The user should not be able to click the button if the user has entered an invalid quantity (i.e. non integer or less than zero).
<Label Grid.Row="5" Grid.Column="0">Quantity:</Label>
<TextBox Name="txtQuantity" Grid.Row="5" Margin="7,0,0,0" Grid.Column="1" HorizontalAlignment="Left" Width="33" />
<Button Name="btnEdit" Content="Edit" Grid.Column="2" HorizontalAlignment="Left" Margin="14,0,0,3" Grid.Row="5" Width="46" RenderTransformOrigin="-0.027,0.5" Height="20" VerticalAlignment="Bottom" Click="btnEdit_Click"/>