RadzenTextArea on text change

Radzen.Blazor Components
1

Hi,
I have a dialog and on this dialog, I have a text area.

@page "/refundreason/{paymentIntentId}"
@using Radzen
@using System.ComponentModel.DataAnnotations
@inject DialogService DialogService

<RadzenStack Orientation="Orientation.Horizontal" Gap="0.5rem" AlignItems="AlignItems.Center" JustifyContent="JustifyContent.SpaceBetween">
<RadzenStack Orientation="Orientation.Horizontal">
    <Content>
        <h2>Refund Reason</h2>
            <RadzenTextArea @oninput="@(args => OnChange(args.Value.ToString()))" class="form-control" aria-label="TextArea" @bind-Value="RefundReason" />
        <RadzenButton class="btn btn-primary mt-2" Click="@((args) => DialogService.Close(RefundReason))"
                Disabled="@IsDisabled">Submit</RadzenButton>
        <RadzenButton class="btn btn-secondary mt-2" Click="@((args) => DialogService.Close(false))">Close</RadzenButton>
    </Content>
</RadzenStack>
</RadzenStack>

@code {
    [Parameter] 
    public string paymentIntentId { get; set; }
    public bool ShowDialog { get; set; } = false;
    public string RefundReason { get; set; } = "";
    public bool IsDisabled { get; set; } = true;
  
    void OnChange(string value)
    {
        //Check if the refund reason is not empty then enable the submit button
        IsDisabled = string.IsNullOrEmpty(RefundReason);
    }
}

I would like to enable Submit button if there is an entry to the text area. Unfortunately, my code is not working the way I want to. Any help would be great.
Thank you.

2

RefundReason = value;
what a shame