Just to give you an idea;

    public class AssemblyLoader
    {
        private static readonly Dictionary<string, Assembly> cachedAssemblies = new Dictionary<string, Assembly>();
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1810:InitializeReferenceTypeStaticFieldsInline")]
        static AssemblyLoader()
        {
            AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_OnAssemblyResolve;
           
        }
        /// <summary>
        /// This method is used to initialize this type through the static constructor for assemblyresolve event handling.
        /// DO NOT REMOVE THIS METHOD, OR THE CALL TO IT!
        /// </summary>
        public static void Initialize()
        {
        }

        public static Assembly CurrentDomain_OnAssemblyResolve(object sender, ResolveEventArgs args)
        {
            try
            {
                string assemblyName = args.Name;
                assemblyName = assemblyName.Substring(0, assemblyName.IndexOf(","));
                return LoadAssembly(assemblyName);
                return null;

            }
            catch (Exception ex)
            {
                Console.WriteLine("converter: " + ex.Message);
                return null;
            }
        }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2001:AvoidCallingProblematicMethods", MessageId = "System.Reflection.Assembly.LoadFile"), System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2001:AvoidCallingProblematicMethods", MessageId = "System.Reflection.Assembly.LoadFrom")]
        private static Assembly LoadAssembly(string assemblyName)
        {
            Assembly assembly;
            if (!cachedAssemblies.TryGetValue(assemblyName, out assembly))
            {
                /*Load infragistics assemblies from where you put them in */
               
            }
            return assembly;
        }
    }