hi every one,
iam try to build aconnection to sql database using sql string inside my c# class, but i cannot use ConfigurationManager i donot know why ? iam beginner in c#.
i have read in enternet, i need Configuration Manager dll file but it doesnot work with me. what can i do ??

plz help
Thanks for all

Did you add it as a reference?

yes Momerath thank you, and it's work