An example purge command that removes messages from the channel it's used in.

purge.cs

[Command("purge")]
[Alias("clean")]
[Summary("Downloads and removes X messages from the current channel.")]
[RequireUserPermission(ChannelPermission.ManageMessages)]
[RequireBotPermission(ChannelPermission.ManageMessages)]
public async Task PurgeAsync(int amount)
{
    // Check if the amount provided by the user is positive.
    if (amount <= 0)
    {
        await ReplyAsync("The amount of messages to remove must be positive.");
        return;
    }

    // Download X messages starting from Context.Message, which means
    // that it won't delete the message used to invoke this command.
    var messages = await Context.Channel.GetMessagesAsync(Context.Message, Direction.Before, amount).FlattenAsync();

    // Note:
    // FlattenAsync() might show up as a compiler error, because it's
    // named differently on stable and nightly versions of Discord.Net.
    // - Discord.Net 1.x: Flatten()
    // - Discord.Net 2.x: FlattenAsync()

    // Ensure that the messages aren't older than 14 days,
    // because trying to bulk delete messages older than that
    // will result in a bad request.
    var filteredMessages = messages.Where(x => (DateTimeOffset.UtcNow - x.Timestamp).TotalDays <= 14);

    // Get the total amount of messages.
    var count = filteredMessages.Count();

    // Check if there are any messages to delete.
    if (count == 0)
        await ReplyAsync("Nothing to delete.");

    else
    {
        // The cast here isn't needed if you're using Discord.Net 1.x,
        // but I'd recommend leaving it as it's what's required on 2.x, so
        // if you decide to update you won't have to change this line.
        await (Context.Channel as ITextChannel).DeleteMessagesAsync(filteredMessages);
        await ReplyAsync($"Done. Removed {count} {(count > 1 ? "messages" : "message")}.");
    }
}

Thanks, helped me alote!!

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Thanks mate.