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Editorial Team
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Asked: 2026-05-22T11:28:42+00:00

I’m trying to make this simple call: DataContext dc = new DataContext(ConfigurationManager.ConnectionStrings[MyDB].ConnectionString) And here’s

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I’m trying to make this simple call:

DataContext dc = new DataContext(ConfigurationManager.ConnectionStrings["MyDB"].ConnectionString)

And here’s my app.config file:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <connectionStrings>
    <add name="MyDB" connectionString="Server=STEVEN-PC;Database=MyDB;Trusted_Connection=yes;" />
  </connectionStrings>
</configuration>

But I’m getting an error: Object reference not set to an instance of an object.

It can’t find the connection string. What am I doing wrong?

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1 Answer

  1. Editorial Team

    A common mistake is trying to read a connection string from an app.config from a referenced project instead of from the executable project (the web site or .exe project). You may need to copy the config settings containing the connection string to your main config file.

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