I have a sharepoint foundations 3.0 DB that I need to upgrade to 2013. I built a sharepoint foundations 2010 server to uprade the DB to 2010. I can change the default DB just fine to mydbserver\sqlprod,2829. When I try to add the content DB I get the following error message. When I try to use Mount-SPContentDatabase WSS_Content_EI2 -databaseserver mydbserver\sqlprod,2829 -webapplicationhttp://servername -DatabaseCredentials $mycredentials, I get the below error stating that it does not like the comma before 2829. Can someone tell me how to add this DB to upgrade it and attach it to 2010? After I get it upgraded I will be adding it to my new 2013 SharePoint foundations server. Thanks in advance for your help.

Error

This content database requires upgrade and could not be attached in this operation. Use either the [stsadm -o addcontentdb] command or [Mount-SPContentDatabase] cmdlet instead.

Troubleshoot issues with Microsoft SharePoint Foundation.

Correlation ID: dcdd3419-e25f-46c6-a589-0344e8e889a4

Date and Time: 7/13/2015 8:28:22 AM

PS C:\> Mount-SPContentDatabase WSS_Content_EI2 -databaseserver mydbserver\sqlprod,2829 -webapplicationhttp://servername -DatabaseCredentials $mycredentials
Mount-SPContentDatabase : Cannot convert 'System.Object[]' to the type 'System.
String' required by parameter 'DatabaseServer'. Specified method is not support
ed.
At line:1 char:56
+ Mount-SPContentDatabase WSS_Content_EI2 -databaseserver <<<<  mydbserver\sqlprod,2829 -webapplicationhttp://servername -DatabaseCredentials $mycrede
ntials
    + CategoryInfo          : InvalidArgument: (:) [Mount-SPContentDatabase],
   ParameterBindingException
    + FullyQualifiedErrorId : CannotConvertArgument,Microsoft.SharePoint.Power
   Shell.SPCmdletMountContentDatabase

Thanks for your help