some minor fixes

Bank/BankDatabaseImplement/Implements/TransferStorage.cs

@@ -66,13 +66,13 @@ namespace BankDatabaseImplement.Implements
 			{
 				MakeTransfer(context, model);
 				context.Transfers.Add(newTransfer);
+				context.SaveChanges();
 			}
 			catch
 			{
 				transaction.Rollback();
 				throw;
 			}
-			context.SaveChanges();
 			transaction.Commit();
 			return newTransfer.GetViewModel;
 		}
@@ -94,13 +94,13 @@ namespace BankDatabaseImplement.Implements
 				});
 				MakeTransfer(context, model);
 				oldTransfer.Update(model);
+				context.SaveChanges();
 			}
 			catch
 			{
 				transaction.Rollback();
 				throw;
 			}
-            context.SaveChanges();
 			transaction.Commit();
 			return oldTransfer.GetViewModel;
         }
@@ -121,13 +121,13 @@ namespace BankDatabaseImplement.Implements
 					Sum = oldTransfer.Sum,
 				});
 				context.Transfers.Remove(oldTransfer);
+				context.SaveChanges();
 			}
 			catch
 			{
 				transaction.Rollback();
 				throw;
 			}
-            context.SaveChanges();
 			transaction.Commit();
 			return oldTransfer.GetViewModel;
 		}

Bank/BankDatabaseImplement/Implements/WithdrawalStorage.cs

@@ -81,13 +81,13 @@ namespace BankDatabaseImplement.Implements
                 if (newWithdrawal == null)
 					throw new InvalidOperationException("Error during creating new withdrawal");
 				context.Withdrawals.Add(newWithdrawal);
+                context.SaveChanges();
             }
             catch
             {
 				transaction.Rollback();
                 throw;
 			}
-            context.SaveChanges();
 			transaction.Commit();
 			return newWithdrawal.GetViewModel;
 		}
@@ -102,16 +102,17 @@ namespace BankDatabaseImplement.Implements
                 withdrawal = context.Withdrawals.FirstOrDefault(x => x.Id == model.Id);
                 if (withdrawal == null)
 					throw new InvalidOperationException("Updating withdrawal was not found");
+				if (withdrawal.RequestId != null)
+					throw new InvalidOperationException("Update was rejected: withdrawal was done");
 				withdrawal.Update(model);
-                MakeWithdrawal(context, model);
                 withdrawal.UpdateAccounts(context, model);
+                context.SaveChanges();
             }
             catch
             {
                 transaction.Rollback();
                 throw;
             }
-            context.SaveChanges();
             transaction.Commit();
             return withdrawal.GetViewModel;
 		}
@@ -119,13 +120,24 @@ namespace BankDatabaseImplement.Implements
 		public WithdrawalViewModel? LinkToRequest(int withdrawalId, int requestId)
 		{
 			if (requestId <= 0 || withdrawalId <= 0)
-				return null;
+				throw new InvalidOperationException("Id must be positive number");
 			using var context = new BankDatabase();
-			var withdrawal = context.Withdrawals.FirstOrDefault(x => x.Id == withdrawalId);
-			if (withdrawal == null)
-				return null;
-			withdrawal.LinkToRequest(requestId);
-			context.SaveChanges();
+			using var transaction = context.Database.BeginTransaction();
+			Withdrawal? withdrawal;
+			try
+            {
+			    withdrawal = context.Withdrawals.FirstOrDefault(x => x.Id == withdrawalId);
+			    if (withdrawal == null)
+					throw new InvalidOperationException("Withdrawal was not found");
+			    withdrawal.LinkToRequest(requestId);
+			    context.SaveChanges();
+			}
+			catch
+			{
+				transaction.Rollback();
+				throw;
+			}
+			transaction.Commit();
 			return withdrawal.GetViewModel;
 		}
 

Bank/BankManagersClientApp/Controllers/HomeController.cs

@@ -377,7 +377,7 @@ namespace BankManagersClientApp.Controllers
 		}
 
 		[HttpPost]
-		public void WithdrawalUpdate(int withdrawal, int sum, List<int> accounts)
+		public void WithdrawalUpdate(int withdrawal, List<int> accounts)
 		{
 			if (APIClient.Client == null)
 				throw new Exception("Вы как суда попали? Суда вход только авторизованным");
@@ -392,7 +392,7 @@ namespace BankManagersClientApp.Controllers
 			APIClient.PostRequest("/api/withdrawal/updatewithdrawal", new WithdrawalBindingModel
 			{
                 Id = withdrawal,
-				Sum = sum,
+				Sum = 0,
 				WithdrawalAccounts = dictionary,
 			});
 			Response.Redirect("Withdrawals");

Bank/BankManagersClientApp/Views/Home/WithdrawalUpdate.cshtml

@@ -16,12 +16,6 @@
 			</select>
 		</div>
 	</div>
-	<div class="row">
-		<div class="col-4">Сумма:</div>
-		<div class="col-8">
-			<input type="number" name="sum" id="sum" />
-		</div>
-	</div>
 	<div class="row">
 		<div class="col-4">Счета:</div>
 		<div class="col-8">