Value cannot be null. Parameter name: path

Question

I'm working with a local dataBase in a Windows Form Application and I'm trying to implement the source for the dataBase as DataDirectory, so in case I'm moving the db from one computer to another, it will work just fine. I wrote the following code, but I get this error, that the value cannot be null, at the line where it gets the Fullpath. Thanks !

var dataDirectory = ConfigurationManager.AppSettings["DataDirectory"];
var absoluteDataDirectory = Path.GetFullPath(dataDirectory);
AppDomain.CurrentDomain.SetData("DataDirectory", absoluteDataDirectory);
var connString = (@"Data Source= |DataDirectory|\Angajati.sdf");

Look at the error just for a moment. It is already telling you exactly what is wrong. — , Aug 27 '15 at 06:35
Why don't you get it from connection string section inside your app.config? — Sirwan Afifi, Aug 27 '15 at 06:35
I know what the error tells. But I don't know how to solve it. — Ezekiel, Aug 27 '15 at 06:42

score 1 · Accepted Answer · edited May 23 '17 at 11:53

1

You should have this section in your app.config:

<appSettings>
    <add key="DataDirectory" value="DataDirectoryPath"/>
</appSettings>

By the way for accessing DataDirectory you have to use this code:

AppDomain.CurrentDomain.GetData("DataDirectory")

more info.

edited May 23 '17 at 11:53

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answered Aug 27 '15 at 06:53

Sirwan Afifi

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Works. Shows that the path is correct, but it doesn't insert in the db. I mean. It goes till the /Debug but then enter a folder named DataDirectoryPath. why? – Ezekiel Aug 27 '15 at 07:00

Value cannot be null. Parameter name: path

1 Answers1