Drag and drop works

Letter.cs

@@ -1,44 +1,52 @@
 using Godot;
 using System;
 
-public class Letter : AnimatedSprite
+namespace lettergodot
 {
-    private string letter = "A";
-    private Label label;
 
-    public string Value
+
+    public class Letter : AnimatedSprite
     {
-        get { return letter; }
-        set
+        private string letter = "A";
+        private Label label;
+
+        public string Value
         {
-            letter = value;
-            UpdateLetter();
+            get { return letter; }
+            set
+            {
+                letter = value;
+                UpdateLetter();
+            }
+        }
+
+        public override void _Ready()
+        {
+            // create label with a letter assigned as a text
+            label = new Label();
+            label.Text = letter;
+            // make label text bold and centered
+            label.AddFontOverride("font",
+                new DynamicFont()
+                    { FontData = new DynamicFontData() { FontPath = "res://Roboto-Bold.ttf" }, Size = 30 });
+            // make color of the text dark orange
+            label.AddColorOverride("font_color", new Color(1, 0.5f, 0));
+            // make text centered in the sprite
+            label.RectPosition = new Vector2(-10, -15);
+            label.RectSize = new Vector2(64, 64);
+            label.Align = Label.AlignEnum.Left;
+            label.Valign = Label.VAlign.Top;
+            // add label to the sprite
+            AddChild(label);
+        }
+
+        private void UpdateLetter()
+        {
+            // update text of the label
+            // to the letter assigned to the letter variable
+            label.Text = letter;
         }
     }
 
-    public override void _Ready()
-    {
-        // create label with a letter assigned as a text
-        label = new Label();
-        label.Text = letter;
-        // make label text bold and centered
-        label.AddFontOverride("font",
-            new DynamicFont() { FontData = new DynamicFontData() { FontPath = "res://Roboto-Bold.ttf" }, Size = 30 });
-        // make color of the text dark orange
-        label.AddColorOverride("font_color", new Color(1, 0.5f, 0));
-        // make text centered in the sprite
-        label.RectPosition = new Vector2(-10, -15);
-        label.RectSize = new Vector2(64, 64);
-        label.Align = Label.AlignEnum.Left;
-        label.Valign = Label.VAlign.Top;
-        // add label to the sprite
-        AddChild(label);
-    }
 
-    private void UpdateLetter()
-    {
-        // update text of the label
-        // to the letter assigned to the letter variable
-        label.Text = letter;
-    }
 }