Hi Radhika
YOUR COMMENTED UPDATE STATEMENT , ONLY THE SINGLE QUOTES ARE MISSING ,USE THE BELOW LINE AND CHECK IF THE PROBLEM IS SOLVED
OleDbCommand cmd = new OleDbCommand("UPDATE codefixermp_tblMembers SET Firstname=@Firstname, Lastname=@Lastname,Address=@Address,City=@City,County=@County,Password=@Password,Comments=@Comments WHERE ID='" + uID.Text + "'", con);