ASP.NET取得觸發Postback的Button

ASP.NET取得觸發Postback的Button

HTML:

<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" Width="100px" UseSubmitBehavior="false" />

C#:

protected void Page_Load(object sender, EventArgs e)
{
    if (this.Request.Form["__EVENTTARGET"] == btnSubmit.UniqueID)
    {
            btnSubmit.Enabled = false;
    }
}