Content Types in SharePoint 2010

A content type is a reusable collection of metadata (columns), workflow, behavior, and other settings for a category of items or documents in a Microsoft SharePoint Server 2010 list or document library. Content types enable you to manage the settings for a category of information in a centralized, reusable way.

More : http://technet.microsoft.com/en-us/library/cc262735.aspx

Create all SharePoint List's Template Automatically

SPWeb web = workflowProperties.Web;
string[] listnames = (from SPList lst in web.Lists
                        select lst.Title).ToArray();

foreach (string s in listnames)
{
    web.Lists[s].SaveAsTemplate(s, s, string.Empty, false);
}

Coding Standards with Example for C++ and C#

Coding Standards C & C#