Any Recommendations on Core

I am starting a core .DLL class that I will be using as a pre-req to my programs.  I just started it, and wanted to get some recommendations/ideas on what everyone else is including in their files.  
What functions/subs does everyone else like to include in their's, and what do you find helpful to include.  

I want to get some feed back so that I can start building a DLL of the most usesful stuff that I will probally use, but wanted to see what others have found useful before I started.
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CodeCruiserConnect With a Mentor Commented:
>what everyone else finds useful in their Core Library Collections.

Totally varies from one person to next depending on type of company/projects, developers, platform, technology stack, frameworks used etc so I don't think anyone would give you a list of things to include. Include stuff that is used across projects so you can reuse code.
David Johnson, CD, MVPOwnerCommented:
Pretty hard to include the telerik packages in to your own dll
I would suggest you only put generic stuff in there which is unlikely to change often. Do not put any project specific stuff if you plan to use it across projects.
afrpaAuthor Commented:
Right, that's exactly what I am looking for.  I just want to collect insight on what everyone else finds useful in their Core Library Collections. This way I can get a collaborative list of ideas to include for code in the library.  

What type of code inventories have you found useful in the process of putting togetether so you can use it for cross-program access.

Things such as.

Reading/Writing File functions
WMIC Access Functions
etc.  Just looking to get a collective insight on what I will need to remember to include.
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