small things

DataDomain/Person.cs

@@ -9,9 +9,9 @@ namespace DataDomain
     public class Person
     {
         public int Id { get; set; }
-        public string? FirstName { get; set; }
-        public string? LastName { get; set; }
-        public string? NickName { get; set; }
+        public string FirstName { get; set; }
+        public string LastName { get; set; }
+        public string NickName { get; set; }
         public DateTime? Born { get; set; }
     }
 }

StockDAL/StockMarketRepository.cs

@@ -143,7 +143,7 @@ namespace StockDal
                         {
                             StockMarketList.Add(SaveRow.StockName, SaveRow);
                         }
-                        catch (ArgumentException ae)
+                        catch (ArgumentException )
                         {
                             try
                             {

StockDAL/StockRepository.cs

@@ -44,7 +44,7 @@ namespace StockDAL
         {
             using var context = new StockContext();
             var output = (from stk in context.Stocks
-                          where stk.SoldDate == null
+                          where stk.SoldDate == null || stk.ActValue > 0
                           select stk).ToList();
             return output;
         }

StockInfo/frmSelling.cs

@@ -76,6 +76,11 @@ namespace StockInfo
             CalcNumberAndValue();
         }
 
+        private void txtSoldAmount_TextChanged(object sender, EventArgs e)
+        {
+            CalcNumberAndValue();
+        }
+
         private void CalcNumberAndValue()
         {
             if (txtSoldPrice.Text.IsNumeric() && txtSoldAmount.Text.IsNumeric())
@@ -84,10 +89,5 @@ namespace StockInfo
                 txtRemainingNo.Text = stkMemSelected.ActAmount > 0 ? (stkMemSelected.PostAmount - long.Parse(txtSoldAmount.Text)).ToString() : 0.ToString();
             }
         }
-
-        private void txtSoldAmount_TextChanged(object sender, EventArgs e)
-        {
-            CalcNumberAndValue();
-        }
     }
 }