Josef questions

• Get first item of IGrouping
• SQL - How can I JOIN two tables and SUM a column based on IDs between them?
• Android devices doesn't recognize attached hardware with FTDI chip
• Fetching last insert id shows wrong number
• Get list of all checked nodes and its subnodes in treeview
• Checking if server is online from Java code
• Communicating with serial USB device over Android
• JSON.Net error reading

Josef answers