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# Activity sample
Illustrates how to have your workflow wait for an external activity that is fulfilled by a worker that you implement.
This workflow will wait for the get-approval activity and pass the request string to it as an input.
builder
.StartWith<HelloWorld>()
.Activity("get-approval", (data) => data.Request)
.Output(data => data.ApprovedBy, step => step.Result)
.Then<CustomMessage>()
.Input(step => step.Message, data => "Approved by " + data.ApprovedBy)
.Then<GoodbyeWorld>();
Then we implement an activity worker to pull pending activities of type get-approval, where we can inspect the input and submit a response back to the waiting workflow.
var approval = host.GetPendingActivity("get-approval", "worker1", TimeSpan.FromMinutes(1)).Result;
if (approval != null)
{
Console.WriteLine("Approval required for " + approval.Parameters);
host.SubmitActivitySuccess(approval.Token, "John Smith");
}
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