Authorizing SharePoint Site

I wrote a method which will convert the word documents in a sharepoint library into PDF.

public WordToPDF(string fileName, string filePath, string userName, string passWord)

    {
        //Code to convert word to PDF.

    }

I can give the username and password hardcoded.But in runtime I am unable to use this method.Because you are unable to ret开发者_如何学JAVArive the password in sharepoint.So How can I modify the above function? Thank YOU.

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I assume, I understood the question(:

If you are using this in a web part that will be published, you can elevate user priviliges.

Check here