Below is an example of using async await in for loop in C#:
public async Task DoSomethingInForAsync()
{
var collection = await YourListCallerMethodAsync();
var tasks = new List<Task>();
for (int i = 0; i < collection.Count; i++)
{
var task = DoSomethingElseInForAsync(item[i]);
tasks.Add(task);
}
await Task.WhenAll();
}