VS 2010 / Page Rewritten Before Button Event?

I have a textbox and a button on a page. When the user clicks the button, it calls a function in the codebehind that inputs the text from the textbox into a sql table. Or at least it should. I can't get it to work properly.

Here's what I have.

ascx file:

Code:
<asp:Label ID="lblTicketComments" runat="server" Visible="false"></asp:Label>
<asp:TextBox ID="txtNewCommentText" runat="server" CssClass="NewCommentText" TextMode="MultiLine"></asp:TextBox>
<asp:Button id="btnNewCommentSubmit" Text="Add Comment" runat="server" OnClick="NewCommentSubmit_Click" />
ascx.cs file:

Code:
protected void Page_Load(object sender, System.EventArgs e)
{
btnNewCommentSubmit.Click += new EventHandler(this.NewCommentSubmit_Click);
if (UserCanSeeThisTicket())
{
PrintTicketComments(); //outputs the comments to lblTicketComments
PrintlblNewTicketStuff();

[code]....

It seems the page is being reloaded before PostComment(); is ever executed, because no matter what I type in the text box, it always posts to SQL as "Write Comment Text Here..." However, if I remove the button click even and just put PostComment() in Page_Load under if(this.IsPostBack), it works fine. (but this is not ideal because I will need other buttons later which will cause a postback) So what am I doing wrong?