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im developing a winform and i store my connection in App.config
<add key="CS" value="Server=localhost;User ID=root;Password=123456;Persist Security Info=True;Database=dbMember"/>

and this is how i call the connectionString from C#
string CS = System.Configuration.ConfigurationManager.AppSettings.Get("CS");

yes, it can run smoothly at my machine, how it show error msg: "the connection property has not been set or is null", when i try to run it at another PC.

but it working at another PC if i manually code the connectionstring like this:
string CS= "Server=localhost;User ID=root;Password=123456;Persist Security Info=True;Database=dbMember";

any advice? i already install the same version of sql at both PC
Posted 22-Jan-13 21:33pm
Amol_B 23-Jan-13 4:48am
"the connection property has not been set or is null" is indication of non initialization of connection. You are reading string from config file, but are you using it in connection?

1 solution

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Solution 1

You shouldn't store and access your connection strings this way.
Do it as suggested by Microsoft:[^]

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