//备份
    public bool DBBack(string path, string DBName)
    {
        SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
        string sql = "use master;";
        sql += "backup database @dbName to disk=@path;";
        SqlCommand cmd = new SqlCommand(sql, conn);
        cmd.Parameters.Add("@dbName", SqlDbType.Char);
        cmd.Parameters["@dbName"].Value = DBName;
        cmd.Parameters.Add("@path", SqlDbType.Char);
        cmd.Parameters["@path"].Value = DBName;
        try
        {
            conn.Open();
            cmd.ExecuteNonQuery();
            conn.Close();
        }
        catch(Exception ex)
        {
            conn.Close();
            return false;
        }
        return true;
    }
    //还原
    public bool DBRestore(string path, string DBName)
    {
        SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
        string sql = "use master;";
        sql += "restore database @dbName from disk=@path;";
        SqlCommand cmd = new SqlCommand(sql, conn);
        cmd.Parameters.Add("@dbName", SqlDbType.Char);
        cmd.Parameters["@dbName"].Value = DBName;
        cmd.Parameters.Add("@path", SqlDbType.Char);
        cmd.Parameters["@path"].Value = DBName;
        try
        {
            conn.Open();
            cmd.ExecuteNonQuery();
            conn.Close();
        }
        catch (Exception ex)
        {
            conn.Close();
            return false;
        }
        return true;
    }