1.These are Initialized on constructors.
2.These are Can be assigned for reference types.
3.These Variables set at run time.
1.Constants Variable set at compile time itself.
2.Constants must be initialized at declaration time.
3.Constants Assigned for value types only.
4.Constants only primitive data types.
ASP.NET by default, submits the form to the same page. Cross page posting is submitting the form to a different page. This is usually required when you are creating a multi page form to collect information from the user on each page. When moving from the source to the target page, the values of controls in the source page can be accessed in the target page.
To use cross-page posting, you have to use the PostBackURL attribute to specify the page we want to post to.