POSTing data to a webpage with a C# windows app

Question

Hey guys. I am trying to post a string to a webpage on my server, but I am not sure how to do it. I have tried peicing some code together from what I have read on the net, but I cannot find any real examples.

Has anyone done this?

Here is some crap code I am trying to get to work, but I am not realy sure what I am doing here since I have never done anything like this before.

[code]
string sql = "INSERT INTO tblWhatever (field1,field2) VALUES ('1','2')";

HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create("http://www.mywebsite.com/mypage.php");

myReq.Method = "POST";

myReq.ContentType = "application/x-www-form-urlencoded";

StreamWriter writer = new StreamWriter(myReq.GetRequestStream());

writer.Write(sql);

writer.Close();
[/code]

Thanks for any input!