HAY UN AVANCE

Vista/FrmCategorias.cs

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+using Controladora;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Vista
+{
+    public partial class FrmCategorias : Form
+    {
+        public FrmCategorias()
+        {
+            InitializeComponent();
+            RecargarTabla();
+        }
+
+        private void RecargarTabla()
+        {
+
+            dgvCategorias.DataSource =  ControladoraCategorias.Instance.Listar();
+        }
+
+        private void btnAñadir_Click(object sender, EventArgs e)
+        {
+            new FrmCategoria().ShowDialog();
+            RecargarTabla();
+        }
+    }
+}