how to create my own namespace...

Question

how to create my own namespace of database connectivity in a project and use in .cs file of every .aspx page ??

Answer 1

Current answer

Add your namespace to web.config, system.web section

<system.web>
   <pages>
      <namespaces>
        <add namespace="mynamespace"/>
      </namespaces>
    </pages> 
...

now mynamespace classes are visible on every aspx page.

.

Old answer (was given on vague question)

Try in solution explorer: Project (mouse right button click) -> Properties -> Default Namespace.

Don't forget to change current page(s) namespace (Resharper will help you)