那就从数据库读取这条记录,对应取出各字段的值,
string connectionString = "Data Source=192.168.1.3;Initial Catalog=data;User ID=sa;password=sa;Integrated Security=False";             
        string queryString = "select  账户,姓名,密码  from table";  
        using (SqlConnection connection = new SqlConnection(connectionString))  
        {  
            SqlCommand command = new SqlCommand(queryString, connection);  
            connection.Open();  
            SqlDataReader reader = command.ExecuteReader();  
            try  
            {  
                while (reader.Read())  
                {                   
                  textBox1.Text = reader[0].ToString().Trim();  
                  textBox2.Text  = reader[1].ToString().Trim();  
                  textBox3.Text  = reader[2].ToString().Trim();    
                ……                        
                }  
            }  
            finally  
            {  
                command.Dispose();  
                connection.Close();  
  
            }  
        }