Hello, everyone.

Now I'd like to create small SolidWorks Add-in with C#.

So I did it but it does not work.

Belows are my code.

[Guid("BB75C0FD-3720-45E5-8B80-2ACB34900F7E")]
[ComVisible(true)]
public class MyAddin:ISwAddin
{

   SldWorks swApp = null;
   public bool ConnectToSW(object ThisSW, int Cookie)
   {
       MessageBox.Show("My C# Add-In Loaded!", "My C# Add-In", MessageBoxButtons.OK, MessageBoxIcon.Information);
       try
       {
           //try to connect to an existing open instance of SolidWorks:
           swApp = (SldWorks)Marshal.GetActiveObject("SldWorks.Application");
       }
       catch (Exception)
       {
           //try to open a new instance:
           try
           {
               swApp = new SldWorks();
           }
           catch (Exception ex)
           {
               MessageBox.Show("Can't connect to SolidWorks and can't open a new SolidWorks instance.\\n" + ex.Message, "Error connecting to SolidWorks", MessageBoxButtons.OK, MessageBoxIcon.Warning);
               return false;
           }
       }
       swApp.Visible = true;

       //now also try to make sure PDM add-in is enabled:
       try
       {
           string appPath = swApp.GetExecutablePath();
           appPath = appPath.Substring(0, appPath.LastIndexOf('\\\\')) + "\\\\SOLIDWORKS PDM";    //e.g. C:\\Program Files\\SOLIDWORKS Corp\\SOLIDWORKS -> C:\\Program Files\\SOLIDWORKS Corp\\SOLIDWORKS PDM

           string pdmAddinPath1 = \\\$"{appPath}\\\\PDMSW.dll";
           string pdmAddinPath2 = \\\$"{appPath}\\\\epdmlib.dll";

           //try the first addin dll
           if (!File.Exists(pdmAddinPath1))
           {
               DialogResult dlgRes = MessageBox.Show(\\\$"Can't load the PDM add-in:\\n\\n{pdmAddinPath1}\\n\\nPlease manually turn on the PDM Add-in in SolidWorks and click OK to continue", "Enable PDM Manually", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
               if (dlgRes == DialogResult.Cancel) throw new Exception();
           }
           try
           {
               swApp.LoadAddIn(pdmAddinPath1);
           }
           catch (Exception)
           {
               throw;
           }

           // try the second addin dll
           if (!File.Exists(pdmAddinPath2))
           {
               DialogResult dlgRes = MessageBox.Show(\\\$"Can't load the PDM add-in:\\n\\n{pdmAddinPath2}\\n\\nPlease manually turn on the PDM Add-in in SolidWorks and click OK to continue", "Enable PDM Manually", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
               if (dlgRes == DialogResult.Cancel) throw new Exception();
           }
           Cursor.Current = Cursors.WaitCursor;
           try
           {
               swApp.LoadAddIn(pdmAddinPath2);
           }
           catch (Exception)
           {
               throw;
           }
       }
       catch (Exception ex)
       {
           MessageBox.Show(\\\$"Couldn't load the PDM addin.  Nothing about this is going to work right.\\n\\n{ex.Message}", "PDM Add-in not found", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
           //return null;
       }

       return false;
   }

   public bool DisconnectFromSW()
   {
       swApp.SendMsgToUser("My C# Add-In Unloaded!");
       Marshal.ReleaseComObject(swApp);
       swApp = null;

       return true;
   }
}

Hope someone help me. Thank you in advance.