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How to use DotConnect for PostgreSQL and entity framework code first

I am trying to use the POstgreSQL database in my project. I would like to learn first about code development. I download dotconnect for PostgreSql (trial) and I added the dll Devart.Data.PostgreSql to my links. Then I added these lines to my app.copnfig

 <connectionStrings>
        <add name="SchoolDBConnectionString" connectionString="Server=localhost;Port = 5432;Database=MyDataBase;user Id=postgres;password=*****" providerName="Devart.Data.PostgreSql" />
    </connectionStrings>
<system.data> 
    <DbProviderFactories>
        <remove invariant="Devart.Data.PostgreSql" />
        <add name="dotConnect for PostgreSQL" invariant="Devart.Data.PostgreSql" description="Devart dotConnect for PostgreSQL" type="Devart.Data.PostgreSql.PgSqlProviderFactory, Devart.Data.PostgreSql, Version= 6.8.333.0, Culture=neutral, PublicKeyToken=09af7300eec23701" />
    </DbProviderFactories>
  </system.data>
</configuration>

When I run my application, I have this release:

An error occurred while retrieving vendor information from the database. This may be caused by the Entity Framework using the wrong connection string. Check the internal exceptions and verify that the connection string is correct.

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<provider invariantName="Devart.Data.PostgreSql" type="Devart.Data.PostgreSql.Entity.PgSqlEntityProviderServices,
Devart.Data.PostgreSql.Entity, Version=7.1.26.6, Culture=neutral, PublicKeyToken=09af7300eec23701" />


<entityFramework>
    <providers>
      <provider invariantName="Devart.Data.PostgreSql" type="Devart.Data.PostgreSql.Entity.PgSqlEntityProviderServices,
      Devart.Data.PostgreSql.Entity, Version=7.1.26.6, Culture=neutral, PublicKeyToken=09af7300eec23701" />
    </providers>
</entityFramework>

: 7.1.26.6 .

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