var baseUrl = "https://hooks.slack.com/services/XXXXXXXXX"; // The base url of the Slack app.
var channelPath = "XXXXXXXXX/xXxxxXxxxXXxxxxXXxXxx"; // The channel path.

var message = new Message()
    .SetChannel(channel)
    .SetText("test-text");

using (var client = new SlackClient(new Uri(baseUrl)))
{
	var result = await client
		.SendMessageAsync(message);
}

var baseUrl = "https://hooks.slack.com/services/XXXXXXXXX"; // The base url of the Slack app.
var channelPath = "XXXXXXXXX/xXxxxXxxxXXxxxxXXxXxx"; // The channel path.

var message = new Message()
    .SetChannel(channel)
    .AddAttachment(x => x
        .SetTitle(y => y
            .SetText("test-title")
            .SetLinkUrl("https://slack.com"))
        .SetText("test-text")
        .SetAuthor(y => y
            .SetName("test-auhtor")
            .SetLinkUrl("http://slack.com")
            .SetIconUrl("https://platform.slack-edge.com/img/default_application_icon.png"))
        .SetFallbackText("falback-text")
        .SetColor(Color.Green)
        .SetImageUrl("https://platform.slack-edge.com/img/default_application_icon.png")
        .SetThumbUrl("https://platform.slack-edge.com/img/default_application_icon.png")
        .SetFooter(y => y
            .SetText("text-footer")
            .SetIconUrl("https://platform.slack-edge.com/img/default_application_icon.png"))                );

using (var client = new SlackClient(new Uri(baseUrl)))
{
	var result = await client
		.SendMessageAsync(message);
}