Done

WinFormsLibrary1/UserCheckedListBox.cs

@@ -34,18 +34,16 @@ namespace WinFormsLibrary1
 		{
 			get
 			{
-				string checkedItems = "";
-				for (int i = 0; i < checkedListBox.Items.Count; i++)
+
+                if (checkedListBox.SelectedItem != null)
                 {
-					if (checkedListBox.GetItemChecked(i))
-					{
-						checkedItems += checkedListBox.Items[i].ToString() + " ";
+                    return checkedListBox.SelectedItem.ToString();
                 }
-				}
-				if (checkedListBox.CheckedItems != null)
-					return checkedItems;
                 else
+                {
                     return "";
+                }
+
             }
 			set
 			{

WinFormsLibrary1/UserDateTimePicker.cs

@@ -53,17 +53,12 @@ namespace COP
 			set
 			{
 				
-				if (!minValue.HasValue || !maxValue.HasValue)
+				if (!minValue.HasValue || !maxValue.HasValue || value < minValue || value > maxValue)
 				{
-					throw new NoRangeException("Диапозон не был задан");
-				}
-				if (value < minValue || value > maxValue)
-				{
-
 					return;
-                   
 				}
 				
+
 				dateTimePicker.Value = value.Value;
 
 			}