How to Save COM Port data to a SQL Server with TimeStamp ?

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C#

SQL-Server

string

COMPort

I am saving incoming data from COM Port to a String first and then displaying sub string from that string in a richTextBox1.

I need to save substrings with TimeStamp to a SQL Server Database. What i need to do for it ? Thanks !

In below code, i need to store substring with TimeStamp in SQL Server:

private void DisplayData(MessageType type, string msg)
        {
           richTextBox1.Invoke(new EventHandler(delegate
            {
                string substring = string.Empty;
              if (msg.Length > 54)
                    substring = msg.Substring(54, 3);
                 richTextBox1.AppendText(substring) ;
            }));
        }