title: Write excel file in C# 2.0 without using any third party dlls/interop/sdk
body: <p>I want to write a excel file (xls/xlsx) in C#. </p>
  
  <p>Constraints:<br/>
  I don't want to use following things while writing:<br/>
  1. Third Party dll( My client is not allowing me to use third party dll )<br/>
  2. SDK(Same as above reason as am not allowed to download)<br/>
  3. Not allowed to use interop as in target server there is no office installed.<br/>
  4. OpenXml</p>
  
  <p>Info:<br/>
  1. Using VS 2005.<br/>
  2. Using ASP.Net (C# 2.0)<br/></p>