private Control GetConfigurationControl(WebPartTransformer transformer) {
            Control configurationControl = transformer.CreateConfigurationControl();

            if (configurationControl == null) {
                return null;
            }
            if (configurationControl is ITransformerConfigurationControl) {
                string configControlTypeName = configurationControl.GetType().AssemblyQualifiedName;

                if (_pendingTransformerConfigurationControlTypeName != null &&
                    _pendingTransformerConfigurationControlTypeName != configControlTypeName) {

                    DisplayConnectionError();
                    return null;
                }
                else {
                    _pendingTransformerConfigurationControlTypeName = configControlTypeName;
                    return configurationControl;
                }
            }
            else {
                throw new InvalidOperationException(SR.GetString(SR.ConnectionsZone_MustImplementITransformerConfigurationControl));
            }
        }
 private bool HasConfigurationControl(WebPartTransformer transformer) {
     return (transformer.CreateConfigurationControl() != null);
 }
 private Control GetConfigurationControl(WebPartTransformer transformer)
 {
     Control control = transformer.CreateConfigurationControl();
     if (control == null)
     {
         return null;
     }
     if (!(control is ITransformerConfigurationControl))
     {
         throw new InvalidOperationException(System.Web.SR.GetString("ConnectionsZone_MustImplementITransformerConfigurationControl"));
     }
     string assemblyQualifiedName = control.GetType().AssemblyQualifiedName;
     if ((this._pendingTransformerConfigurationControlTypeName != null) && (this._pendingTransformerConfigurationControlTypeName != assemblyQualifiedName))
     {
         this.DisplayConnectionError();
         return null;
     }
     this._pendingTransformerConfigurationControlTypeName = assemblyQualifiedName;
     return control;
 }