SPSolution.Deployed Property
Returns a value indicating whether the solution is deployed to one or more web applications in the farm.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: No
Property Value
Type: System.Booleantrue if the solution is deployed to one or more web applications; otherwise, false.
To determine whether a language pack is deployed, use SPSolutionLanguagePack.Deployed.