Which technology is best to develope web application C#.net or PHP ??

hi @bportlock: yes u r right , but some people told me that php is open source platform , so it's better than C#.net , but i know C# is very interesting and popular language than PHP ....

so what can do now ?

I answered to this in parts in your other thread here:
https://www.experts-exchange.com/questions/26847182/can-i-make-window-application-in-PHP.html

In essence: both languages can not really be compared. If you want to make programs for the web AND for the desktop, you will have to get used to dealing with different programming languages.

Sorry, I have to revise my above statement in parts: if you want a popular, free, cross-platform development tool that works inside a browser and stand-alone on the desktop, consider checking out Java.

"...some people told me that php is open source platform , so it's better than C#.net ..."

It's not better, it's just different. At the end of the day, whichever one you use executes the same binary code on the processor. Use whichever one of them that YOU are best at.

@torimar re Java...

Java also works via JSP and Jakarta / Tomcat / Struts etc so maybe Java is best fit for a solution. Especially since C# mimics a lot of Java features.