This is an old ASP.Net hack to upload file without page refresh in ASP.Net web pages.

Long back I wrote a post about uploading files to Sky Drive from C# Winform application. This post is about uploading an image to Facebook using C# without any 3rd party library.

In WP8, Microsoft introduced libraries for both Text to Speech and Speech to Text without an active internet connection. But this feature is not available in WP7. I found some article implementing Text to Speech using BING API, but seems it is no more working. Here is one implementation using BING REST API, which helps to integrate text to speech in in you WP7 applications.

Today I got another problem with Excel file opening. One of the my colleague wrote code to generate XLS / XLSX file using OleDb object. And it was working perfectly. Only problem, while opening the XLS / XLSX file, MS Excel was displaying an error like this.

To verify excel installed on my local system; initially I tried using OpenSubKey() method. But it was always returning null, even though I can see the registry key using regedit.exe. I was using a Windows 8, x64 bit OS and the application was developed in VS 2008, Winforms, x86 platform. Later I found the reason - A 32-bit application on a 64-bit OS will be looking at the HKLM\Software\Wow6432Node node by default. To read the 64-bit version of the key, you’ll need to specify the RegistryView enumeration using OpenBaseKey() method.(This API is added in .Net 4.0.) And if you are using .Net 3.5 or below, either you need to build the application using Any CPU or x64 platform target.

Today I faced an issue, I want to open an excel file from a Windows application; before opening the file, I want to verify that MS Excel installed on the system. I found a solution using registry from MSDN.