Adding Toolbox to Xamarin

Question

I am  new to IDE-Xamarin

 

I have created the Empty asp.net solution and added the web form content with code behind file to the project.

 

I have to add controls like textbox,label etc. to the .aspx  file from toolbox, but in the tool box window, I get there are no tools available for the current document.

 

please help me solve this

 

Thanks in advance..