What is strong-typing versus weak-typing? Which is preferred? Why?

Strong type is one in which the Type of variables are Checking during the compile time.Weak-Typing referes checking the type of variables during run time.

As far as ASP.Net is Concerned,it is a Strongly typed Language.if we change or remove the Property or a field Name then the Complier shows the Error messages where it has Been Misspelled or where it is referred so that we can easily identify and remove it .

In short ,in a strongly typed language we need not worry about syntax and type errorsas it can be Easily identified.

For large Chunk Codes , Strong typing is preferred.