string.Join throws an exception
.net, .net-3.5, .net-4.0, c#, string
Solution
`Join` is a static method on `String`, so call it using the type instead of an instance like this
args = string.Join(" ", s);
Problem
I am converting a working .NET 3.5 application to .NET 4.0 and after changing the target framework I'm getting an error I've never seen before. Member 'string.Join(string, params string[])' cannot be accessed with an instance reference; qualify it with a type name instead. Here is the code: ``` /// <summary> /// /// </summary> /// <returns>command arguments as single line</returns> public virtual string ToLine() { List<string> argumentsList = new List<string>(); CollectArguments(argumentsList); String args = null; foreach (string s in argumentsList) args = args.Join(" ", s); return ComandName().Join(" ", args); } ``` Obviously something changed from 3.5 to 4.0 but I'm having a hard time figuring out how I should modify this code to get it to compile.