我是新来的C＃编程，不知道如何在Visual Studio 2013中设置目标框架？当我右键单击项目 - >属性我看到属性页窗口没有左柱，没有应用程序选项卡。 我试图建立一个解决方案，我有这样的几个误区：

I am new to C# programming and don't know how to set the "Target Framework" in visual studio 2013? When I right click on the project -> Properties I see no left column of the property pages window with no Application tab. I tried to build a solution and I got several errors like this:

6的错误的类型或命名空间名称对象集找不到（是否缺少using指令或程序集引用？）

Error 6 The type or namespace name 'ObjectSet' could not be found (are you missing a using directive or an assembly reference?)

和后来我发现这个答案 链接

And then I found this answer link

不过，我真的不知道如何更改目标框架。请帮我。先感谢您。

But I don't actually know how to change the target framework. Please help me. Thank you in advance.

截图。我使用Visual Studio专业版2013

Screenshot. I use Visual Studio Professional 2013

推荐答案

右键单击项目>单击属性>首选项卡 - >目标框架

Right Click a project > click properties > first tab -> Target Framework