Connecting Database using c# in Visual Studio 2013 [closed]

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I have a problem connecting my database (created in SQL Server 2008 R2 Express) with c# in vs 2013

Here is the code I wrote

string connStr = ConfigurationManager.ConnectionStrings["newSchool"].ToString();
SqlConnection conn = new SqlConnection(connStr);

the error is NullReferenceException

Answer 1

Where did you define your connection string? In the app.config? Please send us the place where you configure this.

See http://msdn.microsoft.com/en-us/library/ms254494(v=vs.110).aspx for help.

See http://www.connectionstrings.com/ how to configure a connection string for .net

Answer 2

Change this:

string connStr = ConfigurationManager.ConnectionStrings["newSchool"].ToString();

to...

string connStr = ConfigurationManager.ConnectionStrings["newSchool"].ConnectionString;

Cheers -

Answer 3

I assume that there is no connection string named newSchool. It is probably NewSchool or some other casing.

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In response to your comment: You need to provide a proper connection string. The ConfigurationManager is used to get a value from the configuration. The NullReferenceException shows you that the setting you request is not there.

You need to create a connection string first using the settings manager and then you can access it.