diff --git a/DbFirst.BlazorWebApp/Components/MassDataGrid.razor b/DbFirst.BlazorWebApp/Components/MassDataGrid.razor
index 2be4a6b..60aecd4 100644
--- a/DbFirst.BlazorWebApp/Components/MassDataGrid.razor
+++ b/DbFirst.BlazorWebApp/Components/MassDataGrid.razor
@@ -137,7 +137,7 @@ else
                         <DxTextBox @bind-Text="editModel.CustomerName" Width="100%" />
                     </DxFormLayoutItem>
                     <DxFormLayoutItem Caption="Amount">
-                        <DxTextBox @bind-Text="editModel.AmountText" Width="100%" />
+                        <DxSpinEdit @bind-Value="editModel.Amount" MinValue="0" DisplayFormat="c2" Width="100%" />
                     </DxFormLayoutItem>
                     <DxFormLayoutItem Caption="Category">
                         <DxTextBox @bind-Text="editModel.Category" Width="100%" ReadOnly="@(!editModel.IsNew)" />
@@ -285,7 +285,7 @@ else
         {
             Id = item.Id,
             CustomerName = item.CustomerName,
-            AmountText = item.Amount.ToString("0.00"),
+            Amount = item.Amount,
             Category = item.Category,
             StatusFlag = item.StatusFlag,
             UpdateProcedure = procedureOptions[0].Value,
@@ -302,12 +302,6 @@ else
         validationMessageStore?.Clear();
         editContext?.NotifyValidationStateChanged();
         var editModel = (MassDataEditModel)e.EditModel;
-        if (!decimal.TryParse(editModel.AmountText, out var amount))
-        {
-            AddValidationError(editModel, nameof(MassDataEditModel.AmountText), "Amount ist ungültig.");
-            e.Cancel = true;
-            return;
-        }
         if (editModel.IsNew)
         {
             var existing = await Api.GetByCustomerNameAsync(editModel.CustomerName);
@@ -321,7 +315,7 @@ else
         var dto = new MassDataWriteDto
         {
             CustomerName = editModel.CustomerName,
-            Amount = amount,
+            Amount = editModel.Amount,
             Category = editModel.Category,
             StatusFlag = editModel.StatusFlag
         };
@@ -357,7 +351,7 @@ else
     {
         public int Id { get; set; }
         public string CustomerName { get; set; } = string.Empty;
-        public string AmountText { get; set; } = string.Empty;
+        public decimal Amount { get; set; }
         public string Category { get; set; } = string.Empty;
         public bool StatusFlag { get; set; }
         public int UpdateProcedure { get; set; }