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Editorial Team
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Asked: 2026-05-14T05:00:52+00:00

I am developing a class library (C#) that i will use it for my

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I am developing a class library (C#) that i will use it for my different projects (later). My class library dll will use the connection string /data context of the project which will reference my new dll. How can i do it?
Lets say i have a class Library Project named “CLP”, and a website project “WP”. I can add reference to CLP.dll file but how i will pass a connection string/data context object to that dll? as CLP.dll will access db based on the connection string of the “WP”.

Not sure my problem is clear or not!

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1 Answer

  1. Editorial Team

    If you develop your class library and it requires a connection string called “ConnectionString” as long as the project you call it from has a connection string in its web/app config file of “ConnectionString” then it should be fine.

    So using your project names. Your “CLP” class project with your data access code in will setup a connection using the string “ConnectionString”:

    _serverConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);

    and then you code against that connection.

    In the web.config file in your web project (“WP”) you add the following:

      <connectionStrings><add name="ConnectionString" connectionString="Data Source=.\SQL2008;Integrated Security=True" providerName="System.Data.SqlClient" /></connectionStrings>

    Obviously pointing to the data source etc you are using for the “WP” project.

    Hope this helps.

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