diff --git a/ServerExplorer/UI/FrmBaseDatos.Designer.cs b/ServerExplorer/UI/FrmBaseDatos.Designer.cs
index efe8dd0..7417fd4 100644
--- a/ServerExplorer/UI/FrmBaseDatos.Designer.cs
+++ b/ServerExplorer/UI/FrmBaseDatos.Designer.cs
@@ -31,15 +31,6 @@
             this.txtConString = new System.Windows.Forms.TextBox();
             this.lblConString = new System.Windows.Forms.Label();
             this.btnCopiarConString = new System.Windows.Forms.Button();
-            this.lsvTablas = new ServerExplorer.Controls.CustomListView();
-            this.colNombreTabla = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
-            this.colEsquema = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
-            this.colTipo = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
-            this.lsvColumnas = new ServerExplorer.Controls.CustomListView();
-            this.colNombreColumna = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
-            this.colTipoDatos = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
-            this.colTamanho = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
-            this.colClave = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.menuBaseDatos = new System.Windows.Forms.MenuStrip();
             this.archivoToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
             this.menuCargar = new System.Windows.Forms.ToolStripMenuItem();
@@ -53,6 +44,16 @@
             this.btnProcs = new System.Windows.Forms.Button();
             this.btnExec = new System.Windows.Forms.Button();
             this.splitContainer1 = new System.Windows.Forms.SplitContainer();
+            this.lsvTablas = new ServerExplorer.Controls.CustomListView();
+            this.colNombreTabla = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
+            this.colEsquema = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
+            this.colTipo = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
+            this.lsvColumnas = new ServerExplorer.Controls.CustomListView();
+            this.colNombreColumna = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
+            this.colTipoDatos = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
+            this.colTamanho = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
+            this.colClave = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
+            this.colNullable = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.menuBaseDatos.SuspendLayout();
             this.splitContainer1.Panel1.SuspendLayout();
             this.splitContainer1.Panel2.SuspendLayout();
@@ -89,79 +90,6 @@
             this.btnCopiarConString.UseVisualStyleBackColor = true;
             this.btnCopiarConString.Click += new System.EventHandler(this.btnCopiarConString_Click);
             // 
-            // lsvTablas
-            // 
-            this.lsvTablas.AllowSorting = true;
-            this.lsvTablas.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
-                        | System.Windows.Forms.AnchorStyles.Left)
-                        | System.Windows.Forms.AnchorStyles.Right)));
-            this.lsvTablas.CheckBoxes = true;
-            this.lsvTablas.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
-            this.colNombreTabla,
-            this.colEsquema,
-            this.colTipo});
-            this.lsvTablas.FullRowSelect = true;
-            this.lsvTablas.Location = new System.Drawing.Point(3, 40);
-            this.lsvTablas.Name = "lsvTablas";
-            this.lsvTablas.Size = new System.Drawing.Size(317, 468);
-            this.lsvTablas.Sorting = System.Windows.Forms.SortOrder.Ascending;
-            this.lsvTablas.TabIndex = 4;
-            this.lsvTablas.UseCompatibleStateImageBehavior = false;
-            this.lsvTablas.View = System.Windows.Forms.View.Details;
-            this.lsvTablas.SelectedIndexChanged += new System.EventHandler(this.lsvTablas_SelectedIndexChanged);
-            // 
-            // colNombreTabla
-            // 
-            this.colNombreTabla.Text = "Tabla";
-            this.colNombreTabla.Width = 169;
-            // 
-            // colEsquema
-            // 
-            this.colEsquema.Text = "Esquema";
-            // 
-            // colTipo
-            // 
-            this.colTipo.Text = "Tipo";
-            this.colTipo.Width = 71;
-            // 
-            // lsvColumnas
-            // 
-            this.lsvColumnas.AllowSorting = false;
-            this.lsvColumnas.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
-                        | System.Windows.Forms.AnchorStyles.Left)
-                        | System.Windows.Forms.AnchorStyles.Right)));
-            this.lsvColumnas.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
-            this.colNombreColumna,
-            this.colTipoDatos,
-            this.colTamanho,
-            this.colClave});
-            this.lsvColumnas.FullRowSelect = true;
-            this.lsvColumnas.Location = new System.Drawing.Point(3, 40);
-            this.lsvColumnas.Name = "lsvColumnas";
-            this.lsvColumnas.Size = new System.Drawing.Size(473, 439);
-            this.lsvColumnas.TabIndex = 6;
-            this.lsvColumnas.UseCompatibleStateImageBehavior = false;
-            this.lsvColumnas.View = System.Windows.Forms.View.Details;
-            // 
-            // colNombreColumna
-            // 
-            this.colNombreColumna.Text = "Columna";
-            this.colNombreColumna.Width = 122;
-            // 
-            // colTipoDatos
-            // 
-            this.colTipoDatos.Text = "Tipo de Datos";
-            this.colTipoDatos.Width = 81;
-            // 
-            // colTamanho
-            // 
-            this.colTamanho.Text = "Tamaño";
-            // 
-            // colClave
-            // 
-            this.colClave.Text = "Clave";
-            this.colClave.Width = 71;
-            // 
             // menuBaseDatos
             // 
             this.menuBaseDatos.Dock = System.Windows.Forms.DockStyle.None;
@@ -318,6 +246,84 @@
             this.splitContainer1.SplitterDistance = 323;
             this.splitContainer1.TabIndex = 17;
             // 
+            // lsvTablas
+            // 
+            this.lsvTablas.AllowSorting = true;
+            this.lsvTablas.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
+                        | System.Windows.Forms.AnchorStyles.Left)
+                        | System.Windows.Forms.AnchorStyles.Right)));
+            this.lsvTablas.CheckBoxes = true;
+            this.lsvTablas.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
+            this.colNombreTabla,
+            this.colEsquema,
+            this.colTipo});
+            this.lsvTablas.FullRowSelect = true;
+            this.lsvTablas.Location = new System.Drawing.Point(3, 40);
+            this.lsvTablas.Name = "lsvTablas";
+            this.lsvTablas.Size = new System.Drawing.Size(317, 468);
+            this.lsvTablas.Sorting = System.Windows.Forms.SortOrder.Ascending;
+            this.lsvTablas.TabIndex = 4;
+            this.lsvTablas.UseCompatibleStateImageBehavior = false;
+            this.lsvTablas.View = System.Windows.Forms.View.Details;
+            this.lsvTablas.SelectedIndexChanged += new System.EventHandler(this.lsvTablas_SelectedIndexChanged);
+            // 
+            // colNombreTabla
+            // 
+            this.colNombreTabla.Text = "Tabla";
+            this.colNombreTabla.Width = 169;
+            // 
+            // colEsquema
+            // 
+            this.colEsquema.Text = "Esquema";
+            // 
+            // colTipo
+            // 
+            this.colTipo.Text = "Tipo";
+            this.colTipo.Width = 71;
+            // 
+            // lsvColumnas
+            // 
+            this.lsvColumnas.AllowSorting = false;
+            this.lsvColumnas.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
+                        | System.Windows.Forms.AnchorStyles.Left)
+                        | System.Windows.Forms.AnchorStyles.Right)));
+            this.lsvColumnas.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
+            this.colNombreColumna,
+            this.colTipoDatos,
+            this.colTamanho,
+            this.colClave,
+            this.colNullable});
+            this.lsvColumnas.FullRowSelect = true;
+            this.lsvColumnas.Location = new System.Drawing.Point(3, 40);
+            this.lsvColumnas.Name = "lsvColumnas";
+            this.lsvColumnas.Size = new System.Drawing.Size(473, 439);
+            this.lsvColumnas.TabIndex = 6;
+            this.lsvColumnas.UseCompatibleStateImageBehavior = false;
+            this.lsvColumnas.View = System.Windows.Forms.View.Details;
+            // 
+            // colNombreColumna
+            // 
+            this.colNombreColumna.Text = "Columna";
+            this.colNombreColumna.Width = 122;
+            // 
+            // colTipoDatos
+            // 
+            this.colTipoDatos.Text = "Tipo de Datos";
+            this.colTipoDatos.Width = 81;
+            // 
+            // colTamanho
+            // 
+            this.colTamanho.Text = "Tamaño";
+            // 
+            // colClave
+            // 
+            this.colClave.Text = "Clave";
+            this.colClave.Width = 71;
+            // 
+            // colNullable
+            // 
+            this.colNullable.Text = "Nullable";
+            // 
             // FrmBaseDatos
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
@@ -369,5 +375,6 @@
         private System.Windows.Forms.Button btnProcs;
         private System.Windows.Forms.Button btnExec;
         private System.Windows.Forms.SplitContainer splitContainer1;
+        private System.Windows.Forms.ColumnHeader colNullable;
     }
 }
\ No newline at end of file
diff --git a/ServerExplorer/UI/FrmBaseDatos.cs b/ServerExplorer/UI/FrmBaseDatos.cs
index 4c2cd7c..87ce3c7 100644
--- a/ServerExplorer/UI/FrmBaseDatos.cs
+++ b/ServerExplorer/UI/FrmBaseDatos.cs
@@ -177,22 +177,9 @@ namespace ServerExplorer.UI
                 {
                     ListViewItem subitem = lsvColumnas.Items.Add(col.Nombre);
                     subitem.SubItems.Add(col.Tipo);
-                    if (col.Tamanho >= 0)
-                    {
-                        subitem.SubItems.Add(String.Format("{0}", col.Tamanho));
-                    }
-                    else
-                    {
-                        subitem.SubItems.Add("");
-                    }
-                    if (col.Primaria)
-                    {
-                        subitem.SubItems.Add("PK");
-                    }
-                    else
-                    {
-                        subitem.SubItems.Add("");
-                    }
+                    subitem.SubItems.Add((col.Tamanho >= 0) ? String.Format("{0}", col.Tamanho) : string.Empty);
+                    subitem.SubItems.Add(col.Primaria ? "PK" : string.Empty);
+                    subitem.SubItems.Add(col.Nullable ? "Null" : "NotNull");
                 }
             }
         }