SPSolution.DeploymentState Property
Gets a value indicating whether the solution has been deployed, and if so, whether it has assemblies installed in the global assembly cache, in the application's bin directory, or both.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: No
Property Value
Type: Microsoft.SharePoint.Administration.SPSolutionDeploymentStateAn SPSolutionDeploymentState value.