Check if the Retention Policy already exits in SharePoint

                 

SPSite objSite = "";

            SPWeb objWeb = null;

            SPContentType objContentType = objWeb = objSite.OpenWeb();

                 objContentType = objWeb.ContentTypes[strContentType];

                 Policy spPolicy = Policy.GetPolicy(objContentType);

                 if (spPolicy == null)

                 {

                     Policy.CreatePolicy(objContentType, null);

                     spPolicy = Policy.GetPolicy(objContentType);

                }