Blazor: How to use the onchange event in when using @bind also?

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@bind is essentially equivalent to the having both value and @onchange, e.g.:

<input @bind="CurrentValue" />

Is equivalent to:

<input value="@CurrentValue" @onchange="@((ChangeEventArgs e) => CurrentValue = e.Value.ToString())" />

Since you’ve already defined @onchange, instead of also adding @bind, just add value to prevent the clash:

<select value="@SelectedCustID" @onchange="@CustChanged" class="form-control">
    @foreach (KeyGuidPair i in CustList)
    {
        <option value="@i.Value">@i.Text</option>
    }
</select>

Source: https://learn.microsoft.com/en-us/aspnet/core/blazor/components/data-binding?view=aspnetcore-3.1

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