[c#] how to set default culture info for entire c# application

I want to set default culture info for that class or for entire application.

For example in Turkey 3,2 = in english 3.2

so application uses my local but i want it to use as default

System.Globalization.CultureInfo.InvariantCulture

How can i set it to that as default for that specific class or for entire application

With 4.0, you will need to manage this yourself by setting the culture for each thread as Alexei describes. But with 4.5, you can define a culture for the appdomain and that is the preferred way to handle this. The relevant apis are CultureInfo.DefaultThreadCurrentCulture and CultureInfo.DefaultThreadCurrentUICulture.

If you use a Language Resource file to set the labels in your application you need to set the its value:

CultureInfo customCulture = new CultureInfo("en-US");
Languages.Culture = customCulture;