done button working

SpriteLibrary/SpriteEntryForm.Designer.cs

@@ -163,6 +163,7 @@
             this.btnDone.TabIndex = 8;
             this.btnDone.Text = "Done";
             this.btnDone.UseVisualStyleBackColor = true;
+            this.btnDone.Click += new System.EventHandler(this.btnDone_Click);
             // 
             // btnCancel
             // 

SpriteLibrary/SpriteEntryForm.cs

@@ -476,13 +476,35 @@ namespace SpriteLibrary
 
         }
 
-        void ApplyChanges()
+        int IndexOfName(string spritname)
+        {
+            for(int i=0; i< SpriteInformation.Count; i++)
+            {
+                if (SpriteInformation[i].SpriteName == spritname)
+                    return i;
+            }
+            return -1;
+        }
+
+        bool VerifySpriteBeforeSaving()
         {
             if (tbSpriteName.Text == "")
             {
                 MessageBox.Show("You cannot save a sprite that has no name.");
-                return;
+                return false;
             }
+            int index = IndexOfName(tbSpriteName.Text);
+            if(index != CurrentSIIndex && index != -1)
+            {
+                MessageBox.Show("You cannot have two sprites with the same name.");
+                return false;
+            }
+            return true;
+        }
+
+        void ApplyChanges()
+        {
+            if (!VerifySpriteBeforeSaving()) return;
             FormToSpriteInformation();
             if (CurrentSIIndex > 0 && CurrentSIIndex < SpriteInformation.Count)
             {
@@ -503,10 +525,9 @@ namespace SpriteLibrary
         /// <returns></returns>
         bool PromptToApplyChangesAndContinue()
         {
-            if (tbSpriteName.Text == "")
+            if (!VerifySpriteBeforeSaving())
             {
-                MessageBox.Show("You cannot save a sprite that has no name.");
+                return true; //We could not verify, say we canceled out.
-                return true;
             }
             if (ValuesDifferFromData())
             {
@@ -712,5 +733,13 @@ namespace SpriteLibrary
                 WeHaveNewItem();
             }
         }
+
+        private void btnDone_Click(object sender, EventArgs e)
+        {
+            if (PromptToApplyChangesAndContinue())
+            {
+                Close();
+            }
+        }
     }
 }