Page_load event fired when button is clicked..

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C#

ASP.NET

I have a login page which include two text box and a button. one is for user name and another is for password. After entering the user name and password when i click the button the page_load event is fired automatically. This makes my if(!IsPostBack) checking useless. Because if the page_load event is fired twice then in the second time the page_load is considered as postback and my login logic inside the if(!IsPostBack) block is never executed..can any one help me with this problem..

with regards
Rain

Here is a code snippet of my login page..

<pre lang="c#">
 protected void Page_Load(object sender, EventArgs e)
        {
Supporter.setStaticVariables();
}

 protected void btnsubmit_Click(object sender, EventArgs e)
        {


            string uname = txtusername.Text;
            string password = txtpassword.Text;
            Session["user"] = txtusername.Text;
            if (!IsPostBack)
            {
                if (checkuser(uname, password, Supporter.strConString))
                    Response.Redirect("Web.aspx");
                else
                {
                    
                    lblmismatch.Visible = true;
                    lblmismatch.Text = "**Password and username doesn't match**";
                }
            }
        }