var client = new WpsClient(httpClient, xmlSerializer);
var capabilities = await client.GetCapabilities("server.uri");

var client = new WpsClient(httpClient, xmlSerializer);
var processOfferings = await client.DescribeProcess("server.uri", "process identifier");

var request = new ExecuteRequest
{
    Identifier = "process identifier",
    Inputs = new[]
    {
        new DataInput
        {
            Identifier = "input identifier",
            Data = new LiteralDataValue{ Value = "test" }
        }
    },
    Outputs = new[]
    {
        new DataOutput
        {
            Identifier = "output identifier"
        }
    },
    ExecutionMode = ExecutionMode.Synchronous,
    ResponseType = ResponseType.Raw
};

var client = new WpsClient(httpClient, xmlSerializer);
var session = await client.AsyncGetDocumentResultAs<YourResultDataType>("server.uri", request);

var pollingTask = session.StartPolling();
session.Finished += (sender, args) => { /* Use the result here. */ };
session.Failed += (sender, args) => { /* The execution has failed. */ };
session.Polled += (sender, args) => { /* The sesssion poller has checked for the status. */ };