Refactoring if-else statements checking for different file extensions
<p>I have this piece of code which i feel could be cleaned up ( i could be wrong) but i wanted to see if anyone has a suggestion how i can change this to be "better"</p>

<pre><code>string getExt = Path.GetExtension(DocumentUNCPath.Text);
        var convertFileId = Guid.NewGuid();
        var convertFilePath = @"c:\temp\" + convertFileId + ".pdf";


        if (getExt == ".doc" || getExt == ".docx" || getExt == ".txt" || getExt == ".rtf")
        {
            WordToPdf(convertFilePath);

        }
        else if (getExt == ".xlsx" || getExt == ".xls")
        {
            ExcelToPdf(convertFilePath);
        }
        else if (getExt == ".jpg" || getExt == ".png" || getExt == ".jpeg" || getExt == ".JPG" || getExt == ".PNG")
        {
            ImgToPDF(convertFilePath);
        }
</code></pre>
