How to update BDC / BCS custom connector DLL programmatically in SharePoint 2010

using System.Management.Automation.Runspaces;

using System.Management.Automation;

public static void UpdateBDCDLL(string webappURL, string strModelName)

        {

            try

            {

// Mapping Assembly of BDC

                string DllPath = @"@"<DLL PHYSICAL PATH>";

                //create powershell runspace

                RunspaceConfiguration config = RunspaceConfiguration.Create();

                PSSnapInException OExSnapIn = null;

                PSSnapInInfo pssnap = config.AddPSSnapIn("Microsoft.SharePoint.PowerShell", out OExSnapIn);

                Runspace cmdlet = RunspaceFactory.CreateRunspace(config);                cmdlet.Open();

                RunspaceInvoke scriptInvoker = new RunspaceInvoke(cmdlet);

// set powershell execution policy to unrestricted

                scriptInvoker.Invoke("Set-ExecutionPolicy Unrestricted");  

// create a pipeline and load it with command object

                  Pipeline pipeline = cmdlet.CreatePipeline();

              StringBuilder sbPSCommand = new StringBuilder();

                sbPSCommand.AppendLine("$assemblyPath = '" + DllPath + "'");

                sbPSCommand.AppendLine("$lobSystem = '" + strModelName + "'");

                sbPSCommand.AppendLine("$url='" + webappURL + "'");

                sbPSCommand.AppendLine("$serviceContext = Get-SPServiceContext $url");

                sbPSCommand.AppendLine("$lobSystem = Get-SPBusinessDataCatalogMetadataObject -ServiceContext $serviceContext -BdcObjectType lobsystem -Name $lobSystem");

                sbPSCommand.AppendLine("Import-SPBusinessDataCatalogDotNetAssembly -LobSystem $lobSystem -Path $assemblyPath -Confirm:$false");

                Pipeline pipeline2 = cmdlet.CreatePipeline();

                pipeline2.Commands.AddScript(sbPSCommand.ToString());

                pipeline2.Invoke();

            }

            catch (Exception ex)

            {

                //exception handling goes here

            }

        }