using System;
using System.Data.SqlClient;


namespace ConsoleApplication5
{
    
    class Class
    {
        public  static string connString="Server=(local);uid=sa;pwd=;database=figo";
        public static string ConnString
        {
            get
            {
                return connString;
            }
        }
        
        

        
        static void Main(string[] args)
        {
           
            string str="update a set thickness='6.5' where id='1'";
            SqlConnection conn=new SqlConnection(Class.ConnString);
            SqlCommand com=new SqlCommand(str,conn);
            
            conn.Open();
            com.ExecuteNonQuery();
这里为什么会是抛出异常？？？？？？？？？？？？？？？？？？？？？？？？？
            conn.Close();
        
        }
    
    }
}