Integrate Dropbox in my web application ( asp.net )

Dropbox does offer an API you can use for listing, uploading, and downloading files, among other operations. You can find everything you need to get started with the Dropbox API, including documentation, tutorials, and SDKs here: https://www.dropbox.com/developers

We recommend using an official SDK if possible, but it is not required. For instance, Dropbox does offer a .NET SDK in particular here: https://github.com/dropbox/dropbox-sdk-dotnet The SDK comes with examples here: https://github.com/dropbox/dropbox-sdk-dotnet/tree/main/dropbox-sdk-dotnet/Examples

You can use that if it works for your scenario, but you can also call the HTTPS endpoints directly without it if you need to or would prefer to: https://www.dropbox.com/developers/documentation/http/documentation

I found Dropbox.Api  v.7.0.0 in Nuget Package but if i try to instal it i have an error : 

Error Could not install package 'Dropbox.Api 7.0.0'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.6.2', but the package does not contain any assembly references or content files that are compatible with that framework. 

which framework should I use? 

If you use the official Dropbox .NET SDK, you should use the latest version of it, which is currently v7.0.0 as shown in your message. That supports .NET Standard 2.0, so please make sure you're using that in your environment.

I'm sorry but I don't understand.

I'm trying to install form the Nuget Package the last version of SDK ( 7.0.0 ).

In my solution the property page as set as target framework : .Net Frameword 4.6.2.

This shoud include the .net standard 2.0 that is necessary for this sdk.

What esle can i check ? 

While we can't provide support for .NET or Visual Studio in particular, as those aren't made by Dropbox, my understanding is that .NET Framework 4.6.2 supports .NET Standard 2.0, so I would expect that to work.

I notice you mentioned you were using Visual Studio 2015 though, which is relatively old, and may contain issues addressed in later versions. I recommend upgrading to a newer version of Visual Studio.

i dont' think that it should be for my verson of visual studio and however i cannot update it.

I'll try to use direct call to api. 

Do you know where can i fine some code for example in .net ? 

Thank you

Luca

Dropbox does not have example code for directly calling the API endpoints from non-SDK .NET code.

The Dropbox API documentation has examples shown using curl; you could use these as starting points and translate them to your .NET network client of choice.