Accessing ConnectionString from CodeBehind

Accessing a ConnectionString from CodeBehind requires your connection string to be defined in the web.config file.

Then use this source code:

ConnectionString = System.Configuration.ConfigurationManager.AppSettings["MySetting"].ToString();

I customized my BasePage with a utility function as follows:

    public string getConnectionString(string vConnectionString)
    {
        System.Configuration.Configuration rootWebConfig = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(Request.ApplicationPath);
        System.Configuration.ConnectionStringSettings connString = null;
        string connectionString = string.Empty;
        if (0 < rootWebConfig.ConnectionStrings.ConnectionStrings.Count)
        {
            connString =
                rootWebConfig.ConnectionStrings.ConnectionStrings[vConnectionString];
            if (connString != null)
                connectionString = connString.ConnectionString;
        }
        return connectionString;
    }

References: http://forums.asp.net/p/1353594/2770309.aspx
http://msdn.microsoft.com/en-us/library/ms178411(VS.80).aspx