Select a data source

- Every LINQ query has three parts to its basic structure.…LINQ query begins with a data source.…The data source consists of a sequence of elements.…The sequence needs to be something…that can be iterated over using a foreach statement…such as an array or a list.…The elements in the sequence…can be of any type of data.…So an array of integers,…or a series of characters,…or a list of objects can all be…the data source for a LINQ query.…This is a declaration for query called state query.…

I'll go into detail about the type of state query later.…For now, I'll focus on the LINQ query specification.…The from clause is used to introduce the data source…or sequence to use in the query.…In this example, the data source is a list…of customer objects representing…the customers for a company.…Cust acts as a range variable.…This is similar to the interation variable…in a foreach statement.…However, in this case, the sequence will not be…iterated over at this point in the program.…When the query executes,…the range variable will be used to…