Assembly Resolver

        private void ThisAddIn_Startup(object sender, System.EventArgs e) 
        { 
            try 
            { 

                AppDomain.CurrentDomain.AssemblyResolve += eraAssemblyResolveEventHandler; } } 


        /// <summary> 
        /// Loads the other .dll from a specific Program Files path 
        /// </summary> 
        /// <remarks>This code runs when there the dll isn't in the Application folder, i.e. when deployed to users</remarks>  
        private static System.Reflection.Assembly eraAssemblyResolveEventHandler(object sender, ResolveEventArgs args) 
        { 
            string asmPath = string.Empty; 
            try 
            { 
                if (args.Name == null || !args.Name.StartsWith("myaddinname")) 
                    return null; 

                //Parse Assembly name from args.Name which uses the format: (AssemblyName, Version=, etc.) 
                string asmName = args.Name.Substring(0, args.Name.IndexOf(",")); 

                if (asmName.Equals("Add-in-Name", StringComparison.OrdinalIgnoreCase)) 
                { 
                    //Load the assembly and return 
                    asmPath = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles) + 
                        "\\Location\\MyFileName.dll"; 
                    return System.Reflection.Assembly.LoadFile(asmPath); 
                } 
                else 
                { 
                    return null; 
                } 
            } 
            catch (Exception e) 
            { 
                //Logging and/or User Message 
                string text = e.Message + Environment.NewLine + asmPath + Environment.NewLine + args.Name; 
                System.Windows.Forms.MessageBox.Show(text, System.Reflection.MethodBase.GetCurrentMethod().Name, System.Windows.Forms.MessageBoxButtons.OK); 
                return null; 
            } 
        }