Open and Edit Script SQL with C#

Question

Guys, good morning. I am developing a software where I need to do the following:
I have a sql script in that part of your code has the command:
"select * from where est_dos_nuel id_est = $id$"

What do I need? Simple, open this file .sql and have the program replace that with a $id$ id that the User will enter the program in a textbox.

Can anyone help me with something please? I have no idea how to do this.


Thank you in personal attention.