controls are not visible on designer view in vs17

Question

I am using vs2017 for xamarin android development,the controls in design view are not visible the control code is avaialble at src code.

 

i have tried following solutions

 

1)tools->options->xaml designer->check the enable xAML designer checkbox->ok

2)Tools>Option>XAML Designer> check Use quadrant based layout

3) created the new project and copied all this code in it but still controls are not visible on designer view

 

Please provide the solution...