Adding null/empty checks to some controls to prevent invalid behaviour

TelegramBotBase/Controls/Inline/Label.cs

@@ -16,7 +16,7 @@ public class Label : ControlBase
 {
     private bool _renderNecessary = true;
 
-    private string _text = string.Empty;
+    private string _text = Default.Language["Label_Text"];
 
     public String Text
     {
@@ -29,6 +29,10 @@ public class Label : ControlBase
             if (_text == value)
                 return;
 
+            if (string.IsNullOrEmpty(value))
+            {
+                throw new ArgumentNullException($"{nameof(Text)}", $"{nameof(Text)} property must have been a value unequal to null/empty");
+            }
 
             _text = value;
             _renderNecessary = true;
@@ -36,6 +40,8 @@ public class Label : ControlBase
         }
     }
 
+
+
     private ParseMode _parseMode = ParseMode.Markdown;
 
     public ParseMode ParseMode

TelegramBotBase/Controls/Inline/MultiToggleButton.cs

@@ -32,10 +32,32 @@ public class MultiToggleButton : ControlBase
     /// </summary>
     public string ChangedString { get; set; } = Default.Language["MultiToggleButton_Changed"];
 
+    private string _title = Default.Language["MultiToggleButton_Title"];
+
     /// <summary>
     ///     This holds the title of the control.
     /// </summary>
-    public string Title { get; set; } = Default.Language["MultiToggleButton_Title"];
+    public String Title
+    {
+        get
+        {
+            return _title;
+        }
+        set
+        {
+            if (_title == value)
+                return;
+
+            if (string.IsNullOrEmpty(value))
+            {
+                throw new ArgumentNullException($"{nameof(Title)}", $"{nameof(Title)} must have been a value unequal to null/empty");
+            }
+
+            _title = value;
+            _renderNecessary = true;
+
+        }
+    }
 
     public int? MessageId { get; set; }
 

TelegramBotBase/Controls/Inline/ToggleButton.cs

@@ -36,7 +36,31 @@ public class ToggleButton : ControlBase
 
     public string ChangedString { get; set; } = Default.Language["ToggleButton_Changed"];
 
-    public string Title { get; set; } = Default.Language["ToggleButton_Title"];
+    private string _title = Default.Language["ToggleButton_Title"];
+
+    public String Title
+    {
+        get
+        {
+            return _title;
+        }
+        set
+        {
+            if (_title == value)
+                return;
+
+            if (string.IsNullOrEmpty(value))
+            {
+                throw new ArgumentNullException($"{nameof(Title)}", $"{nameof(Title)} property must have been a value unequal to null/empty");
+            }
+
+            _title = value;
+            _renderNecessary = true;
+
+        }
+    }
+
+
 
     public int? MessageId { get; set; }