C# build makes PDB files and obj folder
<p>Under my project folder, I find the following folder:</p>

<p>Bin\Debug\</p>

<p>This folder has DLLs and PDBs files.</p>

<p>What are the PDB files and why do I need them?</p>

<p>I also notice the folders:</p>

<p>Obj\Debug\temp<br>
Obj\Debug\tempPE</p>

<p>What are the above 2 folders? What is the purpose of OBJ\DEBUG folder?</p>
