Pass argument from blazor input to function without declaring global variable [closed]

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I am doing this to pass input to a function:

<div class="input-group">
    <input class="form-control"  @onchange="() => Setup(key)" />
</div>

@code
{
    string key;
    private async Task Setup(string key){
    ...
    }
}

I don't need to keep key after I pass it to the function. Is there a way I can do this without declaring it as a global variable?