Most exciting change in c# 10 is the File Level Namespace IMO.
Now, we can remove the curly braces <code>{}</code> from the namespace of the file. The C# compiler will automatically assume that all the classes in the file belongs to the namespace declared at the top.
So, the below code:
<pre><code>namespace MyNamespace
{
 public class MyClass
 {
 }
}
</code></pre>becomes: 
<pre><code>namespace MyNamespace
public class MyClass
{
}
</code></pre>Personally, in my career as a developer I have never declared two namespaces in a single file.
So, this change brings joy to me. :)

Most exciting change in c# 10 is the File Level Namespace IMO.

Now, we can remove the curly braces `{}` from the namespace of the file. The C# compiler will automatically assume that all the classes in the file belongs to the namespace declared at the top.

So, the below code:
```
namespace MyNamespace
{
    public class MyClass
    {
    }
}
```
becomes: 
```
namespace MyNamespace
public class MyClass
{
}
```

Personally, in my career as a developer I have never declared two namespaces in a single file.

So, this change brings joy to me. :)

C# 10 removes a one level of curly braces required in files by automatically assigning namespace declared at the top to all the classes.

C# 10 New Features I