Good bosses,

I graduated from university, 17 years after graduation in his company, is engaged in the secondary development of his (c # winform),

Today can complete some increase in his program function, modify the requirements;
His system interface with other systems, including webservise, view, call other procedures of DLL embedded his way;
Statements such as SQL data statistics article 800100 so there must be,

Now I have some problem, just can't do a program from scratch,
For example, to achieve his one of the most simple functions, completely out of his, his new do a program,

I want to create a new database, put some data into database, and then do a program with the function of login, and then the program can according to the various conditions of the database, query the data out is displayed in the interface,
I want to do such a program, is there any way to learn, what, what books or instance recommend, thank you very much,