Need to know how to create file name and location to save the following

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C#

The black debug window was slowing me down significantly and I was only interested in the last 5 lines of the debug window. I was looking for a way to save the last 5 lines to an external file. Someone wrote me this solution but neglected to add the most important part of what I was looking for. They didn't show me how to create a file name and and location to save the last 5 lines of the debug screen.

             StringBuilder sb = new StringBuilder();
 
            StringWriter sw = new StringWriter(sb);
 
            TextWriterTraceListener myWriter = new TextWriterTraceListener(sw);
 
            Debug.Listeners.Add(myWriter);
//...

            string output = string.Join("\n",
                sb.ToString().Split('\n').Reverse().Take(5).Reverse());