Last post Jun 12, 2018 05:25 AM by Brando ZWZ
Jun 11, 2018 09:29 AM|JagjitSingh|LINK
I am getting above error on below line. I have included below file also - using System.Configuration;
string myConnString = ConfigurationManager.ConnectionStrings["cnnString"].ConnectionString;
Jun 12, 2018 05:25 AM|Brando ZWZ|LINK
According to your description, I suggest you could firstly open the references tag in your project and make sure you have already added the System.Configuration
If you don't find this reference, I suggest you couold follow below steps to add the reference.
Notice: Make sure your .net farmework version larger than 2.0